Cutting method for a diamond with low depth percentage and resultant cut diamond

Abstract

A gemstone, and a method for cutting a gemstone, such that the resulting gemstone has a total depth percentage of between 38-55% but still provides for a brilliant cut without having face main facets intersect a cullet.

Description

BACKGROUND OF THE INVENTIONField of the Invention[0001]This disclosure is related to the field of diamond cutting, and, in particular, it relates to a method of forming a faceted gem having a decreased depth percentage compared to a traditional cut.Description of the Related Art[0002]Faceted gemstones, and particularly cut diamonds, are effectively extremely precise, and very complex, light prisms. A well cut diamond is a solid, ideally transparent, piece of material that includes a large number of faces or “facets” which are cut into its external surface. Those facets serve to direct light within the structure of the diamond so that the diamond is ideally designed to capture as much light as possible, and then redirect that light to the eye of the user. The reflected and refracted light allows for patterns in the facets to be seen through the top or “table” of the diamond. Entering light is reflected and refracted inside the diamond to produce brilliance (the reflection of while li...

AI Technical Summary

Benefits of technology

The invention is a method for cutting and resulting cut gemstones that have multiple facets. The facets include a collet facet, a belly main facet, a face main facet, a shoulder main facet, at least two half facets between the belly main facet and the shoulder main facet, and at least two half facets between the shoulder main facet and the face main facet. The resulting cut gemstone has a unique facet angle and depth profile that enhances its appearance and performance. The invention also includes variations of the cut gemstone with different facet angles and depths.

Problems solved by technology

Faceted gemstones, and particularly cut diamonds, are effectively extremely precise, and very complex, light prisms.

Diamonds with a smaller pavilion are generally considered to have been cut shallow, and have traditionally produced undesirable reflection and refraction appearance.

The uncommon use of stepped cuts in diamonds is primarily because the stepped arrangement provides for fewer possible internal angles of reflection and, therefore, while the stone itself can look very interesting, its light handling abilities may be diminished compared to the alternative.

As each of the 58 facets is cut individually by a diamond cutter and the cutting process is extremely difficult.

Further, raw gemstones take whatever shape nature imparts, and these natural shapes generally are not always ideal for use in jewelry or to make a particular end shape of cut gemstone.

Further, a crystal may not allow for the creation of a stone with ideal proportions without excessive waste, or it may be possible to form a stone into a single ideal cut stone, or into multiple slightly less than ideal cuts.

One problem with round brilliant and other designs, however, is that this depth percentage is not always practical.

A natural raw diamond may be of such a shape that the stone will not accommodate greater than 58% depth percentage without having to undesirably reduce the girdle diameter and lose substantial weight.

Similarly, tall diamonds often look smaller than they are in and may not lend themselves to certain settings.

For example, smaller diamonds, when cut to ideal proportions, may not be readily useable in pendants because the stone will not sit with the table facing outward, but will rotate making it look less attractive.

To compensate for this, the diamond may need to be mounted in a heavier setting to keep it straight This may reduce the light entering the diamond (reducing the effect of the ideal cut) and may make the diamond appear smaller due to the heavy mount and that the depth is not visible from the table.

While this works for certain raw diamonds and can make the stones more readily mountable in these types of settings, it can result in less desirable appearance.

In effect, light is reflected within the diamond, but instead of being directed out the table, the angles are insufficient and result in light going out the sides of the stone instead of the top.

Shallow stones, therefore, are often undesirably uninteresting in light handling characteristics and considered dramatically inferior.

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