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Glossary

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Table
The large facet that caps the crown of a faceted gemstone. In the standard round brilliant, it is octagonal in shape and is bounded by eight star facets.
Table Size
The size of the table of a fashioned diamond, expressed as a percentage of the stone’s narrow-girdle diameter, is a dimension used in proportion analysis. On a round brilliant, it is measured from corner to opposite corner, rather than from flat side to flat side.
Top Cape
An early trade term still used by some dealers to designate the diamond color grade between crystal and cape in the river-to-light-yellow system. Small stones in this range will face up colorless when mounted, but larger stones will have a yellow tint.
Trigon
A triangular indentation occurring as a growth mark on diamond octahedron faces. The sides of the trigon are reversed with respect to the face on which it occurs.
Twinning Lines
Visible line on or with in a fashioned diamond, caused by twinning in the crystal. Since the orientation on one side of a twin plane differs from that on the other, the best polishing direction for one is a poorer one for the other; as a result, a line remains at the surface. Also called knot lines.


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