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WO2019021301A1 - Diamant à taille étagée à haute brillance - Google Patents

Diamant à taille étagée à haute brillance Download PDF

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Publication number
WO2019021301A1
WO2019021301A1 PCT/IN2018/050382 IN2018050382W WO2019021301A1 WO 2019021301 A1 WO2019021301 A1 WO 2019021301A1 IN 2018050382 W IN2018050382 W IN 2018050382W WO 2019021301 A1 WO2019021301 A1 WO 2019021301A1
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WO
WIPO (PCT)
Prior art keywords
diamond
facets
stepped
cut
girdle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IN2018/050382
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English (en)
Inventor
Maheshbhai Shambhubhai KAKADIYA
Ashok kumar Narsinhbhai Donda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sksm Diamonds Impex Ltd
Original Assignee
Sksm Diamonds Impex Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sksm Diamonds Impex Ltd filed Critical Sksm Diamonds Impex Ltd
Publication of WO2019021301A1 publication Critical patent/WO2019021301A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C17/00—Gems or the like

Definitions

  • the present invention relates to the transformation of rough diamond into stepped faceted diamond with high brilliance, more particularly, relates to a cutting and faceting diamond that yield in significantly higher brilliance and weight retention. Furthermore the present invention discloses slant cutting of the stepped cut diamond in other embodiment.
  • Diamonds have annoyed and beguiled centuries for thousands of years, yet the exact history of the precious stone is unknown.
  • the word “diamond” is derived from an ancient Greek verb meaning “I tame” or “I subdue”.
  • the ancient Greeks used this word for the hardest substance known, but it is difficult to tell what that substance was.
  • the brilliance of an ornamental diamond is sensed by a viewer in such a manner that light is incident from the outside into the diamond and the incident light is reflected inside the diamond to reach the viewer.
  • the degree of brilliance of a diamond is determined by a quantity of the reflected light from the diamond.
  • the quantity of reflected light is usually evaluated by a physical quantity of reflected light.
  • Diamonds are commonly assessed in terms of the "4 Cs”: Cut, Clarity, Color, and Carat. Cut refers to both the geometric proportions of a gemstone and the final form into which the rough stone is shaped. The most prominent cuts in the industry are the round brilliant, oval, marquise, pear, heart, princess, trilliant, and radiant. A good cut gives a diamond its brilliance, dispersion, and scintillation, in short, its appearance and appeal. Clarity is the measure by which a diamond is graded for purity, or whiteness.
  • the human perception is not determined by the physical quantity of reflected light only.
  • the diamond needs to provide a large quantity of light to be sensed by the viewer, i.e., a large quantity of physiologically or psychologically visually-perceived reflected light.
  • the Fechner's law states that the quantity of visually-perceived light is the logarithm of the physical quantity of light.
  • the Stevens' law is applied on the assumption that a light source is a point light source, the quantity of visually-perceived light is the square root of the physical quantity of light.
  • Diamonds may be cut into many different geometrical patterns which are known in the art as the round cut, oval cut, pear cut, marquis cut, princess cut, emerald cut, etc.
  • the most popular diamond cut is the standard round cut because of its brilliance and optical light and ling properties. Although caret weight and clarity are factors which will affect the value of the diamond independent of cut geometry, the most significant value is attributed to its optical properties and color.
  • a gemologist will refer to the optical properties of a diamond cut using terms of art such as brilliance, scintillation and symmetry.
  • Brilliance and scintillation correspond to the intensity of returned light
  • scintillation and symmetry relate to the cut parameters of the diamond and the degree to which the cut facets are aligned.
  • a diamond must possess cut parameters which are as close to perfect as possible.
  • a brilliance scope is currently used by most grading institutes, such as the Gemological Institute of America (GIA) and the American Gemological Society (AGS), for analyzing the loss of brilliance on an ideal cut round diamond. Both of these institutes, among others, specialize in grading the most valuable diamonds and the best cut grades available.
  • GAA Gemological Institute of America
  • AGS American Gemological Society
  • emerald and cushion cut diamonds have associated therewith certain parameters. These parameters include the crown angle, the crown height percentage, the girdle height percentage, the pavilion angle, the table percentage and the total depth percentage. Conventionally, the crown angle for an emerald cut is in the range of 35-36°. The pavilion angle is in the range of 40-41.5°.
  • emerald cut diamonds do not provide the brilliance and light reflecting experience which is the hallmark of the round, brilliant cut stones.
  • the diamond trade has invested enormous efforts in searching for and attempting to find cuts that would increase the brilliance of oblong gemstones such as the emerald and cushion cut stones.
  • the diamond Since, in general, the diamond is viewed by looking down at the table and crown facets, it is desirable to induce the maximum amount of light possible through the table and crown facets, down into the stone where it is reflected off of the interior surfaces of the base facets across to the opposite base facets and then back out through the table and crown facets to the viewer.
  • the more optimal the configuration of the stone the more even, intense and uniform is the reflected dome of light perceived by the viewer.
  • the main object of the present invention is to provide stepped cut diamond with has high brilliance and weight retention.
  • Another object of this invention is to provide an ornamental diamond having a pavilion with stepped numerous stripes facets, which allows a viewer to sense extreme brightness when the diamond is viewed from above the table facets thereof.
  • a further object of the present invention is to provide a diamond which differs from the vertical facet cutting along with angular stepped cutting facet which gives more value to diamond, notably because it reflects more light from the pavilion.
  • Another object of the present invention is to provide diamond with extended culet portion that reflects as cumulative pattern for the reflection of the light in the diamond.
  • Yet another object of the diamond is to provide the crown with short height and wide table area to provide high reflection area in the diamond. Yet another object of the present invention is to provide diamond with thin crown and angular stepped cut pavilion that compensatively increase the brilliance in the diamond to resemble three dimension effects when viewed from the table portion of the diamond.
  • the another object of the present invention is to provide diamond cut that have increased weight retention, refractive in terms of good brilliance with respect to current state of art.
  • the further object of the present invention is to provide slanted step facet cut diamond with thin crown height that enhance cumulative brilliance in the diamond.
  • the present invention relates to a stepped cut diamond.
  • the present invention discloses diamond cut with gradually stepped cut facets in pavilion of the diamond for cumulative reflection and dispersion of the light that provides three dimensional views when looked from the table.
  • the schema of the present invention relates to the thin and single facet crown and multiple angular faceted pavilion facets with extended culet that provide multiple reflection pattern in the diamond.
  • the advantages of the present invention are to provide faceted diamond that provides good weight retention, enhanced brilliance and economical compared to current state of the art.
  • the ladder type cut in the pavilion and extended culet at the bottom of the pavilion provides additive to brilliance in the diamond.
  • the present invention discloses the slant faceted stepped cut diamond with cumulative reflection pattern in the diamond.
  • Fig.l shows the bottom view of the diamond as preferred embodiment of the present invention.
  • Fig. 2 shows the top view of the diamond as preferred embodiment of the present invention.
  • Fig. 3 shows the general principal of calculation of the total depth of the diamond from the raw diamond.
  • Fig. 4 shows side view of the diamond as preferred embodiment of the present invention from the corner (4).
  • Fig. 5 shows side view of the diamond as preferred embodiment of the present invention from long side of the diamond
  • Fig. 6 shows side view of the diamond as preferred embodiment of the present invention from short side of the diamond
  • Fig. 7 shows bottom view of the diamond as alternate embodiment of the present invention from long side of the diamond
  • Fig. 8 shows bottom view of the basic horizontal facet in alternate embodiment of the present invention
  • Fig. 9 shows bottom view of the basic horizontal facet in numbered mode as per alternate embodiment of the present invention
  • Fig. 10 shows bottom view of the slanted facet in long side (L) & short side (S') of the diamond in alternate embodiment of the present invention
  • Fig. 11 shows the crown view of the diamond as alternate embodiment of the present invention.
  • Fig. 12 shows side view of the diamond as alternate embodiment of the present invention from the corner (4).
  • Fig. 13 shows side view of the diamond as alternate embodiment of the present invention from short side of the diamond
  • Fig. 1 depicts a generalized representation of a first embodiment of the present invention in which a diamond (D) is shown from bottom view.
  • the process of preparing block on raw diamond is important in the present invention as circumference described in (Fig. 3) plays vital role in deciding the fate of the diamond.
  • the process of mapping and blocking are focused on various defects (if any) in the raw diamonds i.e. flawless, internally flawless and very slightly flawless that may change the pattern of cut for more perfect shape.
  • the mapping ultimately decides the dimension of the final diamond where circumferential value of diamond plays vital role in deciding L/W ratio of the diamond (D).
  • the gist of selection of the perfect diamond from the raw diamond depended on the numerous factors like impurity, defect, presence of blind spot etc.
  • the present embodiment utilizes the depth in the range of 60-65% and L/W ratio is selected in the range of 1.3 - 1.4.
  • the total height of crown and girdle limits in 5-10% of the total depth of the diamond.
  • the diamond is marked accordingly in shrine machine for further processing.
  • the diamond is first given a shape of rectangular block through cutting rough diamond in parallel sides that provide pair of long and short side in the diamond. With the view to understand the geometry in conclusive way parallel pairs of long and short sides are identified as L, L' and S, S' respectively.
  • the corners of the four sides are identically cut with view to create emerald shape of the diamond.
  • the marking of crown and girdle height will be done in the sarine machine.
  • the present invention provides high brilliance diamond with lesser crown height as described in the object of the invention. Therefore, the cut performed in the pavilion plays most crucial role to achieve high brilliance in diamond.
  • Fig. 1 describes best perceptive schema of the present invention in preferred embodiment. After marking the diamond as per height of crown and girdle the diamond (D) is ready for cut from the height of the pavilion.
  • both long sides of the diamond are cut, from the height determined by sarine machine, at the angle ranges from 50°-55° with respect to plane of girdle.
  • the said facets are primary facets and numbered as "F" in Fig. 1.
  • height of each stepped facet, of long sides (L-L') is kept uniform therefore the height of each facet will be l/3 rd height of the total pavilion.
  • diamond (D) is stepped cut at the angle ranges from 40°-45° with respect to plane of table.
  • the said facets are secondary facets and named as "D".
  • diamond is further cut at the angle ranges from 32°-37° with respect to plane of table.
  • the said facets are tertiary facets and named as "B".
  • the tertiary facets at both the long side results in extended culet portion at the bottom of the diamond.
  • facets are made on the long sides (i.e. L-L') of diamond, remaining short sides (i.e. S-S') diamond are cut at the angle ranges from 50°- 55° with respect to plane of girdle.
  • the said facets are primary stepped facets and numbered as "Fl”.
  • the said cut are named as secondary stepped facets and named as "Dl”.
  • diamond is cut at the angle of range between 32°-37° with respect to plane of table.
  • the said cut is tertiary stepped facets and numbered as "Bl”.
  • next stepped corner facets are made on each corner (1-4) at the angle of 50°-55° and subsequently at the angle of 40°-45° with respect to plane of girdle.
  • These facets are numbered as “F2" and "D2" respectively.
  • These corner facets are made on primary and secondary stepped facets made on long and short ends (S-S', L-L') only.
  • the tertiary facets are not cut to have corner facet.
  • This specific arrangement provides four sides of reflection at the bottom of the pavilion region along with extended culet (CT) that concentrate the light rays in bottom region of pavilion and reflect the same in upward direction in the diamond (D).
  • CT extended culet
  • Fig. 1 total number of facets pavilion portion are 20 where culet (CT) extended and emerged on the top of pavilion and facets emerged as ladder type stepped cut towards the girdle plan of the diamond.
  • ⁇ Angles are described with respect to girdle plane.
  • the crown is made up of thin and single facet.
  • This characteristic provides wide table surface area compared to other diamonds.
  • This phenomenon lead to provide wide reflection and refraction out put rays that enhance brilliance in the system.
  • the present diamond has stepped cut pavilion that provide multiple reflection that facilitates cumulating means for rays in the system.
  • the schema of the present invention provides reflection pattern in three dimension impression where the wide table area facilitates the object of the present invention by providing platform.
  • the angles of facets to be made on crown of the document (D) are described in Table -2. .
  • ⁇ Angles are described with respect to girdle plane.
  • Fig. 4 shows side view of the diamond (D) at corner (4), the corner facet is positioned between facets made on short (S') and long side (L) of the diamond.
  • the corner facet plays crucial role in brilliance enhancement where loss of the light occurs if the corners are acute or reflection capacity got compromised due to perpendicular arrangement of adjacent facets.
  • the stepped cut arrangement can be tracked from the Fig. 4 where angular stepped cut facets are shown.
  • the said arrangement is unique in nature where the facets are ladder type cut from the girdle to culet (CT) in parallel manner.
  • CT girdle to culet
  • the height of crown and girdle thickness is relatively less compared to height of pavilion.
  • This arrangement provides high brilliance and additional advantage of weight retention that increases the economical value of the diamond. It's noted that rough diamond are available in the versatile size and shape as they are available in natural form. First ever process step to be performed on the diamond is assorting of the same.
  • the process of mapping involves magnification of each diamond in the machine to have cut of the design.
  • the process of mapping will figure out the best possible shapes of the diamond in order to minimize waste and maximize the yield of the rough diamonds.
  • the process of mapping also focused on various defects in the raw diamonds i.e. flawless, internally flawless, very slightly included that changes design for more perfect shape.
  • the mapping ultimately decides the dimension of the final diamond where circumferential value of diamond plays vital role in deciding L/W ratio of the diamond (D).
  • Fig. 5 describes the diamond in side view with corners 1 and 4.
  • the culet (CT) is prospectively visible at full extent in Fig. 5.
  • the diamond (D) provides ladder type arrangement in specified cut angle shown in the table-1.
  • the depth of the diamond is relatively higher that provides good means for weight retention.
  • the total height of the pavilion prevails in the diamond (D) is approximately 50-55% of circumference value of diamond while crown height is approximately 2-5% of circumferential value of diamond.
  • Fig. 6 describes side view of the diamond (D) with perspective view at corners 1 and 2.
  • the culet (CT) is prospectively visible as pin point from the side view in the Fig. 5.
  • the present view provides perspective view of short side (S) where pyramidal arrangement of facet is visible from the side view and pile of the facets which is parallel to the table plane (T).
  • central wide facets (Fl, Dl, Bl) are belongs to short side (S) of the diamond (D).
  • These facets are made at range of angles with respect to girdle plane at 50-55°, 40°-45° and 32-37° respectively.
  • the height of each facet is regulated by the length/width ratio where the higher ratio leads to increase the height of the facet.
  • the angles describe in the Table-1 is optimized range for the diamond which has L/W ratio in the range of 1.3 - 1.4.
  • the ladder type arrangement shown in Fig. 5 provides means for multiple means of reflection in the diamond (D). The comparison made against the single facet cut diamond where light loss is apparent due to flat surface of the pavilion while stepped cut in the present invention minimizes the light loss in the pavilion region.
  • Fig. 7 describes the bottom view of the second preferred embodiment of the present invention.
  • This embodiment provides the slanted stepped cut facets.
  • the core schema of the arrangement remains same as described in the first embodiment.
  • the total height of crown and girdle remains between 5-10 % of the total depth.
  • the marking and blocking of the diamond (D') remains at par with first embodiment diamond (D).
  • the diamond (D') is first given a shape of rectangular block through cutting rough diamond in parallel sides that provide pair of long and short side in the diamond. With the view to understand the geometry in conclusive way parallel pairs of long and short sides are identified as L, L' and S, S' respectively.
  • the corners of the four sides are identically cut with view to create emerald shape of the diamond.
  • the marking of crown and girdle height will be done in the sarine machine.
  • Fig. 7 describes best perceptive schema of the present invention in preferred embodiment. After marking the diamond as per height of crown and girdle the diamond (D') is ready for cut from the height of the pavilion.
  • the schema of the present invention remains same in the both embodiments where stepped cut diamond is faceted to enhance brilliance in the diamond.
  • First the stepped facets are made on the long and short sides of the diamond (D').
  • primary steps of diamond processing remain same as of first embodiment diamond (D) except angles of facets may differ.
  • the long sides (L-L') and short side (S-S') of diamond (D') have primary, secondary and tertiary facets at the angle of 52-55°, 40°-45° and 25°-30° respectively.
  • the said facets are numbered as F, D, B respectively on long sides (L-L') and Fl, Dl and Bl respectively on short sides (S-S').
  • Table - 4 After having abovementioned facets on the pavilion portion total number of facets are 12 and junction of short and long sides of diamond (D') are perpendicular to each other.
  • the diamond (D') is ready to be facet on the stepped cut diamond.
  • the present embodiment discloses the crossed slanting facet cut on already stepped cut facet. The same is a complex in nature to understand on two dimension diagram. Therefore, to avoid ambiguities first long side L facet crossed slanting is described in Fig. 10 as of basic stepped cut facet as described in the Table - 4. As shown in Fig. 9, for the purpose of convenience edge points are numbered as ⁇ - ⁇ ', ⁇ - ⁇ ', ⁇ - ⁇ ' respectively for primary, secondary and tertiary facets of the long side (L) of diamond (D').
  • slanting cut is made on the primary stepped facet (F) of long side (L) at the K to M' at the angle ranges of 50°-52°.
  • the said facet is numbered as "E”. It divides the original stepped facet "F” in half.
  • slanted facet on secondary facet (D) made between the edge point M-N' at the angle of 40°-43° from the angle of girdle plane.
  • the said facet is numbered as "C”.
  • After having slant facet on secondary facet the last facet is made on tertiary facet (B) from edge point "N" at the angle ranges from 22°-28°.
  • the same type of facets are made on opposite long side (L') and after that short sides (i.e. S-S') to have complete slanting pattern as per this embodiment.
  • the facets made on short side (S-S') are numbered as Al, Bl and CI. Once total slanting facets are made number of facets will be 24.
  • the crown is made up of thin and single facet. On the other side these characteristic provides wide table surface area compared to other diamonds as described in first embodiment.
  • Fig. 12 shows side view of the diamond (D') at corner (4), the corner facet is positioned between facets made on short (S') and long side (L) of the diamond (D').
  • the cross slanting facet "F" on primary stepped facet “E” is shown in perspective view.
  • A, C and E are slanted facets made on long side (L) while Al, CI and El are slanted facet on short side (S') of diamond (D').
  • CT extended culet
  • the heights of diamond (D') in terms of crown, pavilion and girdle are described in the following table-7.
  • Fig. 12 shows side view of diamond (D') at long side (L) between corner 1 & 4. Facets are piled on each other in slanted manner therefore angular arrangement provides zigzag compilation of facets. The difference of angular cut of adjacent facet is in the ranges of 2°-3°. The said arrangement provides enhance brilliance by the way of multiple reflection at minute level as the stepped cut and slanted cut provides multiple means for light reflection and reduces light loss from the pavilion portion.
  • the specific arrangement of the present embodiment provides high surface area in terms of light reflection.
  • Fig. 13 describes side view of the diamond (D') at short side (S') at the corner 4 & 3.
  • This figure shows culet (CT) in a pointed arrangement from the side view.
  • CT culet
  • the angle between primary stepped facets and slanted facets ranges form 9°-14° that may change on the L/W ratio of the diamond.

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Abstract

La présente invention concerne un diamant à taille étagée à haute brillance. La présente invention décrit un diamant taillé avec des facettes taillées graduellement en gradins dans le pavillon du diamant pour une réflexion et une dispersion cumulatives de la lumière qui fournit des vues tridimensionnelles lorsqu'on regarde depuis la table (1, 2, 3, 4, 5, 6, 7). Le schéma de la présente invention concerne la couronne de facette mince et unique et de multiples facettes de pavillon à facettes angulaires avec une colette étendue qui fournissent de multiples motifs de réflexion dans le diamant. Les avantages de la présente invention sont de fournir un diamant à facettes qui offre une bonne rétention de poids, une brillance améliorée et un faible coût par rapport à l'état actuel de la technique. Le type d'échelle découpé dans le pavillon et la colette étendue au fond du pavillon fournissent un additif à la brillance dans le diamant. Dans le second mode de réalisation le plus préféré, la présente invention concerne le diamant taillé en gradins à facettes croisées avec un motif de réflexion cumulative dans le diamant.
PCT/IN2018/050382 2017-07-24 2018-06-09 Diamant à taille étagée à haute brillance Ceased WO2019021301A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201721026202 2017-07-24
IN201721026202 2017-07-24

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WO2019021301A1 true WO2019021301A1 (fr) 2019-01-31

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PCT/IN2018/050382 Ceased WO2019021301A1 (fr) 2017-07-24 2018-06-09 Diamant à taille étagée à haute brillance

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1743563A1 (ru) * 1989-12-13 1992-06-30 Московское Производственное Объединение "Кристалл" Драгоценный камень
US20160120274A1 (en) * 2014-10-31 2016-05-05 Leon Mege Inc. Step-Cut Gemstone

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1743563A1 (ru) * 1989-12-13 1992-06-30 Московское Производственное Объединение "Кристалл" Драгоценный камень
US20160120274A1 (en) * 2014-10-31 2016-05-05 Leon Mege Inc. Step-Cut Gemstone

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