1994-05-04
1995-10-03
Milano, Michael J.
Jewelry
Gem
D11 90, A44C 1700
Patent
active
054542359
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention refers to a diamond without a plate (or table) in which the facets of the upper part (or crown) are more slanted toward the girdle level than the facets of the lower part (or pavilion).
BACKGROUND OF THE INVENTION
Precious stones of the aforementioned type are known from German patent 1,557,625. Angle a between a facet of the upper part and the girdle level and angle b between a facet of the lower part and the girdle level are always selected in such a way that the diamond displays optimal brilliance seen from above. In this case, brilliance means, according to Roesch: What is a cut diamond? in: Goldschmiedezeitung [Goldsmith's Newspaper], Vol. 12, 1971, P. 39, the sum of surface shine and lower part reflection, whereby the light entering the diamond from the upper part is totally reflected on the facets of the lower part. To give a diamond as much "fire" as possible, i.e., the greatest possible opalescence, 50 plus facets were cut on the upper part in such a way that a large number of partially colored reflections pointing in various directions were obtained, contributing considerably to the appreciation of the diamond.
This consideration does not take into account the fact that a diamond is a precious, rarely occurring stone that came into being millions of years ago in the depths of the earth under extreme conditions, in a shape it kept ever since and displays today. To prepare a diamond in such a way that as a jewel, it spreads as much fire as possible, does not, if we consider the history of the stone, do justice to its hardness, constancy and clarity as well as the esthetics of the material.
SUMMARY OF THE INVENTION
The task of the invention is therefore to cut a raw diamond in such a way that with the least possible quantity of material, one gets an impression of its hardness and clarity when looking down on it.
For this, according to the invention, in the diamond mentioned in the beginning, the angle between one of the equally large upper part facets and the preferably polygonal girdle level as well as the angle between one of the equally large lower part facets and the girdle level are selected in such a way that seen from above, the girdle level appears in essentially homogenous, planar brilliance in which a central, shining star is imbedded. The areas of planar brilliance create an impression of calm and hardness, quite befitting of the stone considering its age and consistency. The star lighting up in the middle of the girdle level, with its number of rays influenced by the number of corners of the girdle level, occurs as a purely optical phenomenon, i.e., without additional cut surfaces.
According to a preferred form of construction of the invention, from the two culets (points or tips) of the diamond in the upper part as well as in the lower part, roughly eight to sixteen equally large facets go out, whereby each upper part facet encloses an approx. 20.5 degree angle with the girdle level and each lower part facet encloses an approx. 40 degree angle with the girdle level. In the process, the effect of the many-rayed star predominates over that of the areas of planar brilliance when one contemplates the diamond. The many-rayed quality of the star impression can be increased if the facets of the upper part do not run together at the girdle level at the same angle with the facets of the lower part, but rather they meet each other at the girdle forming a symmetrical off-set structure such that one edge of each upper facet meets the imaginary center line of each lower facet.
According to another form of construction of the invention, the calm and hardness of the stone is particularly accentuated when the girdle level is square and the angle between each of the four upper part facets and the girdle level is chosen at about 24.5 degrees and the angle between each of the lower part facets and the girdle level is chosen at about 39.5 degrees. When observing this stone, a prostrate, shining cross appears on a surface of planar brilliance.
The invention is exp
REFERENCES:
patent: D36103 (1902-10-01), St. John Ward
patent: D36104 (1902-10-01), St. John Ward
patent: 2554901 (1951-05-01), Fromholt
patent: 2587972 (1952-03-01), Crise
patent: 3796065 (1974-03-01), Watermeyer
patent: 3835665 (1974-09-01), Kitchel
patent: 4604876 (1986-08-01), Hoffmann
patent: 4708001 (1987-11-01), Alburger
patent: 5072549 (1991-12-01), Johnston
patent: 5186024 (1993-02-01), Waters, Jr.
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