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Zoning is best seen when looking at the stone through the top table facet.

Color zoning examples can be very easily seen within bicolor ametrine; exhibiting both golden citrine and violet or purple amethyst in a single crystal.

A form of heat treatment for sapphire that adds the element beryllium to the heating process.

A gem that is cut round without facets into the shape of a smooth polished dome.

It lacks the facets that are on most faceted stones. The center stone is the prominent center piece in a jewelry setting that has multiple gemstones. The city in southeastern Thailand famous as one of the world centers for gemstone processing and Thai Gems trading.

When a beam of light enters a doubly refractive gem, it is split into two beams, each travelling at a different speed and on a different path through the crystal.

Birefringence is a measurement of the difference between the two refractive indices in gems that are doubly refractive, and it ranges from a low of .003 to a high of .287.

Brilliance is sometimes referred to as "internal luster" to distinguish it from surface luster.

A tear or pear-shaped stone cut in triangular facets.

This is usually caused by tiny silk rutile inclusions in the stone. A long rectangular gemstone shape, somewhat similar in shape to a loaf of French bread, hence the name.

A round shaped stone cut with a minimum of fifty-eight facets.

Color change gems change color due to changing light conditions (such as alexandrite or color change sapphire) or when viewed from different angles (such as andalusite or iolite).

Traditional gem facets are flat or two-dimensional.

The effect is caused by tiny parallel inclusions that give the appearance of a narrow line similar to a cat's eye.

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