Jewelry – Gem
Reexamination Certificate
2000-02-04
2002-11-05
Swann, J. J. (Department: 3677)
Jewelry
Gem
Reexamination Certificate
active
06474102
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a procedure for determining a high-reflection gem cut, procedure for cutting a high-reflection gem, and a cut gem of high reflection.
2. Description of the Related Art
The reflection or light efficiency of a gem cut essentially depends on the dimension and number of facets and on the angles created by them. Many trials have been carried out in the past for improving gem cuts used in practice or for creating new gem cuts. These trials are based, on the one hand, on empirical cutting trials, or [on the other hand] on simple calculations which also take into account the optical refraction of the raw material to be cut.
For example, DE-AS 1 557 652 specifies combinations of upper part (crown) principal facet angles and lower part (pavilion) principal facet angles for various types of minerals, for example 27°/36° for diamonds, 25°/49° for quartz, 24°/45° for tourmaline, 29°/38° for garnet, 28°/39° for beryl, and 28°/39° for corundum.
All these angle combinations have in common the fact that the lower part (pavilion) principal facet angle is larger than the upper part (crown) principal facet angle.
Such cuts, especially for diamonds, with angle combinations of 24.5°/39.5°, or of 33.5°/41.5° are also known from DE 42 10 995 A1.
It has been proved in practice that the angle combinations mentioned in the literature for gem cutting do not yet produce maximum light efficiency, and that a systematic specification of optimal angle combinations is very desirable for all materials to be cut, which have different optical refraction.
SUMMARY OF THE INVENTION
Therefore, the objective of the invention is to specify a procedure for determining a gem cut, a procedure for gem cutting and a cut gem, whereby optimal light efficiency should be achieved when applying the specified angle values, while talking into consideration the light refraction of the material to be cut.
This objective is solved by a cut gem with characteristics including high reflection with at least three principal pavilion facets and at least three principal crown facets, the angle between the principal pavilion facets and the girdle surface being greater than the angle between the principal crown facets and the girdle surface. At angle 0° a table is formed instead of the principal crown facets, with principal pavilion facet angle (UHFW) ranging between 41° and 46°. Principal crown facet angle (OHFW) corresponds to an angle selected from a group of predetermined, preferred angles, which are subject to mean optical refraction n ranging between 1.50 and 3.00 of the raw material to be cut, and principal pavilion facet angle (UHFW). The group of predetermined, preferred angles includes the following angles:
at n 1.50 and UHFW of 42°
angles of 13° to 33°
at n 1.50 and UHFW of 43°
angles of 60° to 26°
at n 1.50 and UHFW of 44°
angles of 1° to 18°
at n 1.50 and UHFW of 45°
angles of 0° to 9°
at n 1.50 and UHFW of 46°
angles of 0°
at n 1.55 and UHFW of 41°
angles of 18° to 33°
at n 1.55 and UHFW of 42°
angles of 12° to 30°
at n 1.55 and UHFW of 43°
angles of 6° to 26°
at n 1.55 and UHFW of 44°
angles of 1° to 18°
at n 1.55 and UHFW of 45°
angles of 0° to 13°
at n 1.55 and UHFW of 46°
angles of 0° to 5°
at n 1.60 and UHFW of 41°
angles of 17° to 31°
at n 1.60 and UHFW of 42°
angles of 11° to 28°
at n 1.60 and UHFW of 43°
angles of 6° to 23°
at n 1.60 and UHFW of 44°
angles of 1° to 20°
at n 1.60 and UHFW of 45°
angles of 0° to 14°
at n 1.60 and UHFW of 46°
angles of 0° to 6°
at n 1.65 and UHFW of 41°
angles of 16° to 28°
at n 1.65 and UHFW of 42°
angles of 11° to 25°
at n 1.65 and UHFW of 43°
angles of 5° to 21°
at n 1.65 and UHFW of 44°
angles of 1to 17°
at n 1.65 and UHFW of 45°
angles of 0° to 14°
at n 1.65 and UHFW of 46°
angles of 0° to 6°
at n 1.70 and UHFW of 41°
angles of 15° to 27°
at n 1.70 and UHFW of 42°
angles of 10° to 23°
at n 1.70 and UHFW of 43°
angles of 5° to 20°
at n 1.70 and UHFW of 44°
angles of 1° to 17°
at n 1.70 and UHFW of 45°
angles of 0° to 12°
at n 1.70 and UHFW of 46°
angles of 0° to 6°
at n 1.75 and UHFW of 41°
angles of 15° to 25°
at n 1.75 and UHFW of 42°
angles of 10° to 22°
at n 1.75 and UHFW of 43°
angles of 5° to 19°
at n 1.75 and UHFW of 44°
angles of 1° to 15°
at n 1.75 and UHFW of 45°
angles of 0° to 12°
at n 1.75 and UHFW of 46°
angles of 0° to 3°
at n 1.80 and UHFW of 41°
angles of 14° to 24°
at n 1.80 and UHFW of 42°
angles of 10° to 21°
at n 1.80 and UHFW of 43°
angles of 5° to 19°
at n 1.80 and UHFW of 44°
angles of 1° to 14°
at n 1.80 and UHFW of 45°
angles of 0°
0
to 11°
at n 1.80 and UHFW of 46°
angles of 0° to 3°
at n 1.85 and UHFW of 41°
angles of 14° to 23°
at n 1.85 and UHFW of 42°
angles of 9° to 20°
at n 1.85 and UHFW of 43°
angles of 5° to 17°
at n 1.85 and UHFW of 44°
angles of 1° to 14°
at n 1.85 and UHFW of 45°
angles of 0° to 11°
at n 1.85 and UHFW of 46°
angles of 0° to 3°
at n 1.90 and UHFW of 41°
angles of 14° to 22°
at n 1.90 and UHFW of 42°
angles of 9° to 20°
at n 1.90 and UHFW of 43°
angles of 5° to 17°
at n 1.90 and UHFW of 44°
angles of 1° to 14°
at n 1.90 and UHFW of 45°
angles of 0° to 9°
at n 1.90 and UHFW of 46°
angles of 0° to 3°
at n 1.95 and UHFW of 46°
angles of 13° to 22°
at n 1.95 and UHFW of 42°
angles of 9° to 20°
at n 1.95 and UHFW of 43°
angles of 5° to 16°
at n 1.95 and UHFW of 44°
angles of 1° to 13°
at n 1.95 and UHFW of 45°
angles of 0° to 9°
at n 1.95 and UHFW of 46°
angles of 0° to 3°
at n 2.00 and UHFW of 41°
angles of 13° to 22°
at n 2.00 and UHFW of 42°
angles of 8° to 17°
at n 2.00 and UHFW of 43°
angles of 4° to 16°
at n 2.00 and UHFW of 44°
angles of 1° to 12°
at n 2.00 and UHFW of 45°
angles of 0° to 9°
at n 2.00 and UHFW of 46°
angles of 0° to 3°
at n 2.05 and UHFW of 41°
angles of 13° to 19°
at n 2.05 and UHFW of 42°
angles of 8° to 16°
at n 2.05 and UHFW of 43°
angles of 4° to 14°
at n 2.05 and UHFW of 44°
angles of 1° to 12°
at n 2.05 and UHFW of 45°
angles of 0° to 9°
at n 2.05 and UHFW of 46°
angles of 0° to 3°
at n 2.10 and UHFW of 41°
angles of 12° to 19°
at n 2.10 and UHFW of 42°
angles of 8° to 16°
at n 2.10 and UHFW of 43°
angles of 4° to 14°
at n 2.10 and UHFW of 44°
angles of 1° to 12°
at n 2.10 and UHFW of 45°
angles of 0° to 8°
at n 2.10 and UHFW of 46°
angles of 0° to 3°
at n 2.15 and UHFW of 41°
angles of 12° to 18°
at n 2.15 and UHFW of 42°
angles of 8° to 16°
at n 2.15 and UHFW of 43°
angles of 4° to 14°
at n 2.15 and UHFW of 44°
angles of 1° to 11°
at n 2.15 and UHEW of 45°
angles of 0° to 8°
at n 2.15 and UHEW of 46°
angles of 0° to 4°
at n 2.15 and UHFW of 41°
angles of 12° to 17°
at n 2.20 and UHFW of 42°
angles of 8° to 15°
at n 2.20 and UHFW of 43°
angles of 4° to 13°
at n 2.20 and UHFW of 44°
angles of 1° to 10°
at n 2.20 and UHFW of 45°
angles of 0° to 8°
at n 2.20 and UHFW of 46°
angles of 0° to 4°
at n 2.20 and UHFW of 41°
angles of 12° to 17°
at n 2.25 and UHFW of 42°
angles of 8° to 15°
at n 2.25 and UHFW of 43°
angles of 4° to 13°
at n 2.25 and UHFW of 44°
angles of 1° to 10°
at n 2.25 and UHFW of 45°
angles of 0° to 8°
at n 2.25 and UHFW of 46°
angles of 0° to 3°
at n 2.30 and UHFW of 41°
angles of 12° to 17°
at n 2.30 and UHFW of 42°
angles of 7° to 15°
at n 2.30 and UHFW of 43°
angles of 4° to 13°
at n 2.30 and UHFW of 44°
angles of 1° to 10°
at n 2.30 and UHFW of 45°
angles of 0° to 7°
at n 2.30 and UHFW of 46°
angles of 0° to 3°
at n 2.35 and UHFW of 41°
angles of 11° to 17°
at n 2.35 and UHFW of 42°
angles of 7° to 14°
at n 2.35 and UHFW of 43°
angles of 4° to 12°
at n 2.35 and UHFW of 44°
angles of 1° to 10°
at n 2.35 and UHFW of 45°
angles of 0° to 7°
at n 2.35 and UHFW of 46°
angles of 0° to 3°
at n 2.40 and UHFW of 41°
angles of 11° to 16°
at n 2.40 and UHFW of 42°
angles of 7° to 14°
at n 2.40 and UHFW of 43°
angles of 4° to 12°
at n 2.40 and UHFW of 44°
angles of 1° to 10°
at n 2.40 and UHFW of 45°
angles of 0° to 7°
at n 2.40 and UHFW of 46°
angles of 0° to 3°
at n 2.45 and UHFW of 41°
angles of 11° to 16°
at n 2.45 and UHEW of 42°
angles of 7° to 14°
at n 2.45 and UHFW of 43°
angles of 4° to 12°
at n 2.45 and
Chop Andrea
Jacobson & Holman PLLC
Swann J. J.
LandOfFree
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