CA1211293A - Cut for gem stones - Google Patents
Cut for gem stonesInfo
- Publication number
- CA1211293A CA1211293A CA000442704A CA442704A CA1211293A CA 1211293 A CA1211293 A CA 1211293A CA 000442704 A CA000442704 A CA 000442704A CA 442704 A CA442704 A CA 442704A CA 1211293 A CA1211293 A CA 1211293A
- Authority
- CA
- Canada
- Prior art keywords
- facets
- girdle
- facet
- pavilion
- stone
- 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.)
- Expired
Links
- 239000010437 gem Substances 0.000 title abstract 2
- 229910001751 gemstone Inorganic materials 0.000 title 1
- 239000004575 stone Substances 0.000 claims abstract description 27
- 241000579895 Chlorostilbon Species 0.000 claims abstract description 8
- 239000010976 emerald Substances 0.000 claims abstract description 8
- 229910052876 emerald Inorganic materials 0.000 claims abstract description 8
- 238000009827 uniform distribution Methods 0.000 claims 1
- 239000006185 dispersion Substances 0.000 description 5
- 230000003993 interaction Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C17/00—Gems or the like
- A44C17/001—Faceting gems
Landscapes
- Adornments (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a facetted gem of angular shape it is the usual treatment to fashion the stone in a step cut style, notably the emerald cut.
In the invention the embodiment is such that the rows of facets of the emerald cut and its variations are replaced by an arrangement of facets in a brilliant style, resulting in a higher degree of scintilation. This is achieved by the alignment of the main facets of the top and/or bottom with the corners of the stone and at elevation angles that are recognized as being ideal. This alignment is contrary to the customary palacement of facets on a stone of angular shape. The remaining subsidiary facets are positioned accordingly. The resulting cut meets the criteria and appearance of the fully brilliant style.
In a facetted gem of angular shape it is the usual treatment to fashion the stone in a step cut style, notably the emerald cut.
In the invention the embodiment is such that the rows of facets of the emerald cut and its variations are replaced by an arrangement of facets in a brilliant style, resulting in a higher degree of scintilation. This is achieved by the alignment of the main facets of the top and/or bottom with the corners of the stone and at elevation angles that are recognized as being ideal. This alignment is contrary to the customary palacement of facets on a stone of angular shape. The remaining subsidiary facets are positioned accordingly. The resulting cut meets the criteria and appearance of the fully brilliant style.
Description
IMPROVED CUT FOR GEM STONES
This invention relates to a cutting and a p~lishing style for diamonds, the function of which is to ~ ~n arrangement of facets in a fashion to produce an increased brilliancy~ scintillation and dispersion in a stone of an angular shape such as the ernerald cut, though not exclusively.
It is customary to position the facets of an angularly shaped stone, such as the emerald cut and its variations, in alignment with its girdle edges. Efforts are made to preserve the angular character of even the facet placement, such that the facets whether of a step cut zr a brilliant variation on an emerald cut shape are dominant along the axis defining the length and width of the stone. The resultiny reflection and refraction patterns are accordingly lirnited to these directions.
I have found that the brilliancy and scintillation of the faceted stone may be increased by abandoning the step cut facets and their traditional influence on aligning even brilliant style facets to conform with the angular edges of the stone. By the placement of the main facets in alignment with the corners of the stone, the ; traditional disparity of facet size of the emerald cut are lost in favor of a new set of main facets of similar size. This arrangement of facets while maintaining ideal elevation angles, increases the dominant reflection patterns to occur along four axes rather than the traditional two. The subsidiary facets are positioned with their alignments mid-way or approximately thereto, betweeen the main facets, thereby further increasing the reflection patterns. The result is a very agressive interaction between the facets, creating a high degree of scintillation and brilliancy.
Accordinc31y, this invention provides a faceted transparent stone, having a pavilion and a crown separated by a girdle. The girdle comprises a set of girdle facets forming a straight-edged polygon, and the crown and pavilion have thereon cut and polished mair, facets having an alignment with respect to the c~rners formed by adjacent facets of the girdle such that the boundaries between the main facets are not coincident with these said corners and whereby these main facets are set in an equidistant manner about the stone. The main facets of the crown are defined between a row of triangularly shaped upper girdle facets occuring in pairs adjacent to the girdle and a row of star Eacets derining the boundary between the main facets and the table facet where said main facets have contact with adjacent main facets, the table and the girdle. The facets of the pavilion are defined in a like maner to those of the crown and consist of lower girdle facets occuring in pairs and pavilion main facets, with the addition of triangularly shaped lower girdle break facets defining an area between the girdle facet and the adjacent pair of lower girdle facets. These crown main facets are set at an elevation angle of 34.5 degrees and the pavilion main facets at an elevation angle of 40.75 degrees, respectively being ideal angles, and at rotational alignments that are in an equidistant manner about the stone and coincident with the corners of the girdle, so as to produce an optimum balance of brilliance, dispersion and scintillation.
While in figures 1 through 4 the embodiment is shown with an eight sided straight edged polygonal shaped girdle similar in appearance to an emerald cut, such an arrangement of facets is equally applicable to stones having girdle shapes conforming to other configurations, and where the numbers, size and placement of said facets may be amended without significant alteration to the scintillation and brilliancy of the embodiment.
This invention relates to a cutting and a p~lishing style for diamonds, the function of which is to ~ ~n arrangement of facets in a fashion to produce an increased brilliancy~ scintillation and dispersion in a stone of an angular shape such as the ernerald cut, though not exclusively.
It is customary to position the facets of an angularly shaped stone, such as the emerald cut and its variations, in alignment with its girdle edges. Efforts are made to preserve the angular character of even the facet placement, such that the facets whether of a step cut zr a brilliant variation on an emerald cut shape are dominant along the axis defining the length and width of the stone. The resultiny reflection and refraction patterns are accordingly lirnited to these directions.
I have found that the brilliancy and scintillation of the faceted stone may be increased by abandoning the step cut facets and their traditional influence on aligning even brilliant style facets to conform with the angular edges of the stone. By the placement of the main facets in alignment with the corners of the stone, the ; traditional disparity of facet size of the emerald cut are lost in favor of a new set of main facets of similar size. This arrangement of facets while maintaining ideal elevation angles, increases the dominant reflection patterns to occur along four axes rather than the traditional two. The subsidiary facets are positioned with their alignments mid-way or approximately thereto, betweeen the main facets, thereby further increasing the reflection patterns. The result is a very agressive interaction between the facets, creating a high degree of scintillation and brilliancy.
Accordinc31y, this invention provides a faceted transparent stone, having a pavilion and a crown separated by a girdle. The girdle comprises a set of girdle facets forming a straight-edged polygon, and the crown and pavilion have thereon cut and polished mair, facets having an alignment with respect to the c~rners formed by adjacent facets of the girdle such that the boundaries between the main facets are not coincident with these said corners and whereby these main facets are set in an equidistant manner about the stone. The main facets of the crown are defined between a row of triangularly shaped upper girdle facets occuring in pairs adjacent to the girdle and a row of star Eacets derining the boundary between the main facets and the table facet where said main facets have contact with adjacent main facets, the table and the girdle. The facets of the pavilion are defined in a like maner to those of the crown and consist of lower girdle facets occuring in pairs and pavilion main facets, with the addition of triangularly shaped lower girdle break facets defining an area between the girdle facet and the adjacent pair of lower girdle facets. These crown main facets are set at an elevation angle of 34.5 degrees and the pavilion main facets at an elevation angle of 40.75 degrees, respectively being ideal angles, and at rotational alignments that are in an equidistant manner about the stone and coincident with the corners of the girdle, so as to produce an optimum balance of brilliance, dispersion and scintillation.
While in figures 1 through 4 the embodiment is shown with an eight sided straight edged polygonal shaped girdle similar in appearance to an emerald cut, such an arrangement of facets is equally applicable to stones having girdle shapes conforming to other configurations, and where the numbers, size and placement of said facets may be amended without significant alteration to the scintillation and brilliancy of the embodiment.
2~:D3 In the drawings which illustrate one embodiment of the invention, Figure 1 is a top view of the faceted stone;
Figure 2 is a bottom view of the faceted stone;
Figure 3 is an end view of the faceted stonet figure 4 is a side view of the faceted stone.
In the drawings which illustrate the embodiment of the invention the following keys apply:
1 - Girdle edge of the stone.
2 - Main facets of the crown or top portion.
Figure 2 is a bottom view of the faceted stone;
Figure 3 is an end view of the faceted stonet figure 4 is a side view of the faceted stone.
In the drawings which illustrate the embodiment of the invention the following keys apply:
1 - Girdle edge of the stone.
2 - Main facets of the crown or top portion.
3 - Main facets of the pavilion or bottom portion.
4 - Upper girdle facets in pairs.
5 - Lower girdle facets in pairs.
6 - Star facets.
7 - Table facet.
; 8 - Lower girdle break facets.
9 - Girdle corners.
The drawing figures 1 and 2 illustrate the facet arrangement for the stone having a girdle similar in appearance to that of the emerald cut. The main facets 2 and 3 of the crown and pavilion respectively are set with an alignment coinciding with the girdle corners 9 and are thereby placed in an equidistant manner about the stone and at elevation angles that are respectively 34.5 and 40.75 degrees, re~ognized as ideal and thereby produce an optimum balance of brilliance, dispersion and scintillation. The alignment may be altered only to compensate for the elongation of the shape of the stone.
The star facets 6 frame the table facet 7 and form the boundary between the table facet and the main facets 2 of the crown. The upper girdle facets 4 form the boundary between the crown rnain facets 2 and the facets of the girdle 1, defining with the star facets 6 the shape of the main facets 2, the upper girdle facets occuring in pairs with similar alignments and set between those of ' , :
the main facets 2 where this sirnilarity of a]ignments affects thickness contol of the adjacent girdle facets along their upper edge. The lower girdle facets 5 are positioned similarly below the girdle and define the boundary between the pavilion main facets 3 which are aligned in a manner like the crown main facets 2, and the facets of the girdle 1. The addition of the lower girdle break facets 8 defines an area between the girdle facet 1 and the adjacent pair of lower girdle facets 5 for the purpose of controlling the thickness of the girdle facet 1 and is set at an appropriate elevation angle between that of the lower girdle facets 5 and but not exceeding 60 degrees. The lower yirdle break facets 8 thus permit a greater difference in alignments between the facets of the lower girdle facet pairs 5 than their corresponding upper girdle facets, for the purpose o~ increasing reflection patterns.
Further this invention provides a method of facet placement on a stone having a straight-edged polyyonal shaped girdle which increases the scintillation and brilliancy and dispersion by improving the uniformity and distribution of facets and their alignments, while maintaining for the respective facets elevation angles that are recognized as ideal, -thereby increasing the number of directions in which dominant reflections occur, creating an aggressive interaction between the facets with respect to the refraction and reflection of light as it passes through the stone and where the main facets of the crown and pavilion are set at 34.5 degrees and 40.75 degrees respectively so as to with the subsidiary facets at elevation angles recognised as being similarly appropriate, provide an optimum balance of brilliancy, scintillation and dispersion.
These same principles of facet placement are adaptable to other straiyht-ed~ed polygonal shaped yirdle :3 Z~ 33 stones and the individual facets may be amended without signifcant effect on brilliancy,
; 8 - Lower girdle break facets.
9 - Girdle corners.
The drawing figures 1 and 2 illustrate the facet arrangement for the stone having a girdle similar in appearance to that of the emerald cut. The main facets 2 and 3 of the crown and pavilion respectively are set with an alignment coinciding with the girdle corners 9 and are thereby placed in an equidistant manner about the stone and at elevation angles that are respectively 34.5 and 40.75 degrees, re~ognized as ideal and thereby produce an optimum balance of brilliance, dispersion and scintillation. The alignment may be altered only to compensate for the elongation of the shape of the stone.
The star facets 6 frame the table facet 7 and form the boundary between the table facet and the main facets 2 of the crown. The upper girdle facets 4 form the boundary between the crown rnain facets 2 and the facets of the girdle 1, defining with the star facets 6 the shape of the main facets 2, the upper girdle facets occuring in pairs with similar alignments and set between those of ' , :
the main facets 2 where this sirnilarity of a]ignments affects thickness contol of the adjacent girdle facets along their upper edge. The lower girdle facets 5 are positioned similarly below the girdle and define the boundary between the pavilion main facets 3 which are aligned in a manner like the crown main facets 2, and the facets of the girdle 1. The addition of the lower girdle break facets 8 defines an area between the girdle facet 1 and the adjacent pair of lower girdle facets 5 for the purpose of controlling the thickness of the girdle facet 1 and is set at an appropriate elevation angle between that of the lower girdle facets 5 and but not exceeding 60 degrees. The lower yirdle break facets 8 thus permit a greater difference in alignments between the facets of the lower girdle facet pairs 5 than their corresponding upper girdle facets, for the purpose o~ increasing reflection patterns.
Further this invention provides a method of facet placement on a stone having a straight-edged polyyonal shaped girdle which increases the scintillation and brilliancy and dispersion by improving the uniformity and distribution of facets and their alignments, while maintaining for the respective facets elevation angles that are recognized as ideal, -thereby increasing the number of directions in which dominant reflections occur, creating an aggressive interaction between the facets with respect to the refraction and reflection of light as it passes through the stone and where the main facets of the crown and pavilion are set at 34.5 degrees and 40.75 degrees respectively so as to with the subsidiary facets at elevation angles recognised as being similarly appropriate, provide an optimum balance of brilliancy, scintillation and dispersion.
These same principles of facet placement are adaptable to other straiyht-ed~ed polygonal shaped yirdle :3 Z~ 33 stones and the individual facets may be amended without signifcant effect on brilliancy,
Claims (5)
1. A faceted transparent stone, having a pavilion and a crown separated by a girdle, the girdle comprising a set of girdle facets forming a straight-edged polygon the sides of which are not all equidistant to a common central point, the pavilion having thereon cut and polished pavilion main facets having alignment with respect to the corners formed between adjacent girdle facets such that the boundaries between these pavilion main facets are not coincident with these said corners and whereby these pavilion main facets are set in an equidistant manner about the stone and all are at an elevation angle of 40.75 degrees, the crown having thereon cut and polished a table facet and crown main facets, these crown main facets all being at an elevation angle of 34.5 degrees and aligned in the same manner with respect to the said corners and where this said alignment is alterable to maintain the width of the table facet in relation to the lengthening of the shape of the stone.
2. The invention claimed in claim 1 to which subsidiary facets comprising upper and lower girdle facets are applied to the crown and pavilion in a manner permitting control of the thickness of the girdle while applying these facets in pairs along a single girdle facet, the facets within the upper girdle pairs being triangularly shaped share a common edge and define an area between adjacent main facets and the girdle facet, this said control being effected along the girdle facet's upper edge by a great similarity of rotational alignments of the facets within the upper girdle pair to that of the adjacent girdle facet, the control to the lower edge of the girdle facet is effected by the application of the lower girdle break facet defining the area between the lower girdle facet pairs and the adjacent girdle facet where these lower girdle facets are defined similarly to their corresponding upper girdle facets, these lower girdle break facets permit substantially differing alignments within pairs of the lower girdle facets so as to provide a uniform distribution of alignments of the pavilion facets and a corresponding optimum degree of brilliance.
3. The invention claimed in claim 1 and claim 2 to which the application of the facets in type, shape, number and position define an apppearance similar to that of the classical brilliant style for stones of other than a straight edged polygonal shape.
4. The invention claimed in claim 1, claim 2 or claim 3 in which the girdle is octagonal in plan, and is similar in appearance to that of the emerald cut.
5. The invention claimed in claim 1, claim 2 or claim 3 in which the girdle defines a straight edged-polygonal shape of no less than five sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000442704A CA1211293A (en) | 1983-12-07 | 1983-12-07 | Cut for gem stones |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000442704A CA1211293A (en) | 1983-12-07 | 1983-12-07 | Cut for gem stones |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1211293A true CA1211293A (en) | 1986-09-16 |
Family
ID=4126683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000442704A Expired CA1211293A (en) | 1983-12-07 | 1983-12-07 | Cut for gem stones |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1211293A (en) |
-
1983
- 1983-12-07 CA CA000442704A patent/CA1211293A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |