1998-08-13
2000-02-29
Melius, Terry Lee
Jewelry
Gem
D11 89, D11 90, A44C 1700
Patent
active
060294744
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a gemstone on which respectively at least four facets of equal size have been cut in the upper part and the lower part above and below a girdle plane, which have a parallel base edge, wherein the angle between an upper part facet and the girdle plane is less than the angle between a lower part facet and the girdle plane.
2. Prior Art
Such a cut of a gemstone is known, for example, from DE-PS 15 57 625, wherein an equal number of facets on the upper part and facets on the lower part determine the appearance and its optical properties.
A comparable cut is known from DE 42 10 995 A1, wherein it is intended that particular angles between the facets on the upper part and facets on the lower part lead to a particularly noticeable appearance, essentially by planar effects which differ in their brightness.
A further development of these types of cuts is shown in DE 32 02 302 A1, wherein outer facets include the girdle plane.
Finally, DE 27 20 267 C2 shows a diamond, which has a very complex structure of cut surfaces, among them also narrow triangular facets which, combined into groups, widen in a fan shape from the area close to the top of the diamond down to circumferential lateral facets. In its optical effects, the interplay of the multitude of different facets also leads to a complex, rather confusing appearance.
BRIEF SUMMARY OF THE INVENTION
It is the object of the invention to apply a cut which offers a novel appearance regarding brilliance and lightness effects while maintaining the basic shape of the diamond crystal.
In accordance with the invention, this object is attained by a gemstone composed of an upper part and a lower part, said upper and lower parts being disposed at respectively opposite sides of a girdle plane, wherein: each upper part facet forming a first angle (.alpha.) with the girdle plane; lateral edges that extend away from the girdle plane and meet at a tip that is remote from the girdle plane, each lower part facet forming a second angle (.beta.) with the girdle plane, the first angle (.alpha.) being less than the second angle (.beta.); lower part is formed to have connecting lines between said tips; triangular additional facets that fan out from the girdle plane, each group being located between lateral edges of a respective pair or said lower part facets; segment of one of the connecting lines; and of one additional facet of a respective neighboring group.
When observing the gemstone from the top, the fan-like extending group of additional facets at the lower part leads to a reflection for the observer such that, per facet surface, a rayor star-shaped light effect occurs on the four pyramid-shaped facets of the upper part, which is in contrast to the so far known rather planar light effects in connection with the types of cuts mentioned at the outset.
The quadruple bundling of the light in this case leads to the appearance of reflections, which penetrate the total surface of the diamond several times.
Advantageous embodiments of the attainment of the object of the invention ensue from the dependent claims.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
A preferred embodiment will be explained in still more detail by means of the drawings. Shown are in:
FIG. 1, a perspective plan view of the cut gemstone obliquely from below,
FIG. 2, a top view of the gemstone in the direction of the arrow A in FIG. 3,
FIG. 3, a lateral view of the gemstone in the direction of the arrow C in FIG. 4, and
FIG. 4, a bottom view of the gemstone in the direction of the arrow B in FIG. 3.
DETAILED DESCRIPTION OF THE INVENTION
The upper portion of the gemstone, which consists of four top part facets 20 . . . 23 of equal size, which taper to form an upper cap, rises above the square girdle plane. Here the top part facet forms an isosceles triangle. The girdle plane may also be circular.
The lower part of the diamond contains four lower part facets 10 . . . 13, which also form an isosceles triangle.
The common base
REFERENCES:
patent: D244367 (1977-05-01), Saltzman
patent: D250640 (1978-12-01), Grossbard
patent: D297718 (1988-09-01), Cohen et al.
patent: D324003 (1992-02-01), Baranes
patent: D350708 (1994-09-01), Bachar
patent: D362204 (1995-09-01), Eknes
patent: D384592 (1997-10-01), Siman-Tov et al.
patent: D393230 (1998-04-01), Katz
patent: D398552 (1998-09-01), Siman-Tov et al.
patent: D400817 (1998-11-01), Ambar
patent: D402226 (1998-12-01), Wolf
patent: D402582 (1998-12-01), Ambar
Atelier Bunz GmbH
Chop Andrea
Melius Terry Lee
LandOfFree
Polished gemstone does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polished gemstone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polished gemstone will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-672469