Abstract:
The instant application discloses, among other things, a specific set of cutting proportions tailored for the optical characteristics of Silicon Carbide (“SiC”) which may produce a “Hearts &amp; Arrows” reflection pattern.

Description:
FIELD 
       [0001]    This disclosure relates to a way to produce a “Hearts &amp; Arrows” reflection pattern in a transparent Silicon Carbide (“SiC”) gemstone. 
       BACKGROUND 
       [0002]    Generally, facets on precious and semi-precious gemstones are cut so as to provide brilliance to these gemstones in an economical manner. Gemstones may also be cut to provide reflections with patterns visible. 
       SUMMARY OF THE INVENTION 
       [0003]    The instant application discloses, among other things, a specific set of cutting proportions tailored for the optical characteristics of Silicon Carbide (“SiC”) which may produce a “Hearts &amp; Arrows” reflection pattern. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0004]      FIG. 1  is a side view of an example of an SiC gemstone cut with a Hearts &amp; Arrows pattern. 
           [0005]      FIG. 2  is a top view of an example of an SiC gemstone cut with a Hearts &amp; Arrows pattern. 
           [0006]      FIG. 3  is a bottom view of an example of an SiC gemstone cut with a Hearts &amp; Arrows pattern. 
           [0007]      FIG. 4  is an illustration of a flowchart of one way to create an SiC gemstone with a Hearts &amp; Arrows pattern. 
           [0008]      FIG. 5  is an illustration of a bottom view an SiC gemstone with a Hearts &amp; Arrows pattern. 
           [0009]      FIG. 6  is an illustration of a top view an SiC gemstone with a Hearts &amp; Arrows pattern. 
       
    
    
     DESCRIPTION OF THE INVENTION 
       [0010]    Silicon Carbide (SiC) is a compound of silicon and carbon. It exists in a number of crystalline forms, often grouped as polytypes of similar structures. Three common polytypes are 3C (β), 4H, and 6H (α). 3C (β) has a cubic crystal structure; 4H and 6H (α) each have hexagonal crystal structures. 
         [0011]      FIG. 1  is a side view of an example of an SiC gemstone cut with a Hearts &amp; Arrows pattern. Crown  100  is the portion of a gem above the girdle. Crown  100  has star facets  200 , crown main facets  210 , and crown girdle facets  220 . Girdle  130  is the outer edge of the gemstone, separating the Crown  100  and the Pavilion  110 . Girdle  130  is generally located near the area of a gemstone at the widest portion of the gemstone, where Diameter  120  indicates the edge-to-edge width of the gemstone. Table  140  is the largest facet on the gemstone. 
         [0012]      FIG. 2  is a top view of an example of an SiC gemstone cut with a Hearts &amp; Arrows pattern. Star Facets  200 , facets surrounding the table, may be cut at 21.46 degrees. Crown Girdle Facets  220 , facets on the crown near the girdle, may be cut with an angle of 39.00 degrees. Crown Main Facets may be cut at 31.91 degrees. To reduce clutter in this figure, two of each type of facet is identified. One skilled in the art would recognize that in this figure there are eight Star Facets  200 , eight Crown Main Facets  210 , and sixteen Crown Girdle Facets  220 . 
         [0013]      FIG. 3  is a bottom view of an example of an SiC gemstone cut with a Hearts &amp; Arrows pattern. Pavilion Main Facet  300  may be cut at an angle of 40.70 degrees. Pavilion Girdle Facet  310  may be cut at an angle of 41.84 degrees. To reduce clutter in this figure, two of each type of facet is identified. One skilled in the art would recognize that in this figure there are eight Pavilion Main Facets  300  and sixteen Pavilion Girdle Facets  310 . 
         [0014]    An SiC gemstone cut with the angles indicated may display a Hearts &amp; Arrows pattern. One having skill in the art will recognize that slight variations, up to 0.1 degrees greater or smaller, in the cutting angle may still produce the Hearts &amp; Arrows pattern. 
         [0015]      FIG. 4  is an illustration of a flowchart of one way to create an SiC gemstone with a Hearts &amp; Arrows pattern. In this example, a girdle outline is cut  400  to provide a diameter of the SiC gemstone. The pavilion facets are cut  410 , including pavilion main facets and pavilion girdle facets. 
         [0016]    The pavilion facets are polished  420 , as is the girdle  430 . The stone is transferred to allow cutting and polishing of the crown side. 
         [0017]    The crown main, star, and girdle facets are cut  450 , and polished  460 . 
         [0018]      FIG. 5  is an illustration of a bottom view an SiC gemstone with a Hearts &amp; Arrows pattern. The Arrows  510  may be a desired design for an SiC gemstone. To reduce clutter in this figure, only two of the eight Arrows  510  are identified. 
         [0019]      FIG. 6  is an illustration of a top view an SiC gemstone with a Hearts &amp; Arrows pattern. The Hearts  610  may be a desired design for an SiC gemstone. To reduce clutter in this figure, only two of the eight Hearts  610  are identified. 
         [0020]    While the detailed description above has been expressed in terms of specific examples, those skilled in the art will appreciate that many other configurations could be used. Accordingly, it will be appreciated that various equivalent modifications of the above-described embodiments may be made without departing from the spirit and scope of the invention. 
         [0021]    Additionally, the illustrated operations in the description show certain events occurring in a certain order. In alternative embodiments, certain operations may be performed in a different order, modified or removed. Moreover, steps may be added to the above described logic and still conform to the described embodiments. Further, operations described herein may occur sequentially or certain operations may be processed in parallel. Yet further, operations may be performed by a single processing unit or by distributed processing units. 
         [0022]    The foregoing description of various embodiments of the invention has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. It is intended that the scope of the invention be limited not by this detailed description, but rather by the claims appended hereto. The above specification, examples and data provide a complete description of the manufacture and use of the invention. Since many embodiments of the invention can be made without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended.