Gemstone cut

Abstract

A new method of cutting a gemstone known as the “Riemer” cut is provided. The gemstone has a crown portion, a pavilion portion characterized by having four main pavilion facets and a culet base and girdle portion provided between the crown portion and pavilion portion. The main pavilion facets are integrally formed with the culet base thereby creating a pavilion facet base. The “Riemer” cut is applicable to all shapes of stones including round, square, oval, marquise, pear-shaped and rectangular diamonds.

Description

FIELD OF THE INVENTION [0001] The present invention relates to gemstones such as diamonds and more particularly to the cut of the gemstone. BACKGROUND OF THE INVENTION [0002] The value of a diamond is determined by several parameters including clarity, weight, shape, color, and polish. The cut of the gemstone is generally chosen to maximize the fire of the diamond. [0003] However, in order to produce a brilliant cut diamond having good reflection and refraction (light dispersion), a relative large amount of the diamond raw material is wasted. Currently, 50%-80% of a diamond is wasted during the cutting process. Thus in order to obtain a one carat stone, it is not unusual for the diamond cutter to start with a rough stone weighing 1.7 carat, for example. Since the price per carat increases exponentially in proportion to the carat weight, it is highly desirable to reduce the waste and increase the yield from a rough stone. [0004] Yields may be increased during the faceting process by ...

AI Technical Summary

Benefits of technology

[0006] The present invention provides a new way of cutting gemstones and diamonds, which provides diamonds, which are have brilliance comparable with and even greater than conventional or hybrid diamonds and which produce a better yield than conventional cut diamonds. The new cut known as the “Riemer” cuts provides an improved yield of approximately 30% compared with conventional diamond cuts. The “Riemer” cut is applicable to all shapes of stones including round, square, oval, marquise, pear-shaped and rectangular stones. The “Riemer” cut may be utilized with different diamond cuts such as Princess and Radian cut.

Problems solved by technology

However, in order to produce a brilliant cut diamond having good reflection and refraction (light dispersion), a relative large amount of the diamond raw material is wasted.

Currently, 50%-80% of a diamond is wasted during the cutting process.

Previously, the traditional practice was to limit the angle of the base facets to less than 43% to obtain an acceptable reflection and refraction, which limited the potential saving and the consequent increase in yield.

However, the quality and fire of the stone suffered.

However, since many of the facets are added after the bottom pavilion facets have already been cut, there is in fact no improvement in yield.

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