7 Best Of Cat S Eye Gemsona Release Date
All other types of cat s eye gems require an additional varietal designation such as cat s eye apatite. Cat s eye any of several gemstones that when cut en cabochon in convex form highly polished display a luminous band reminiscent of the eye of a cat.
The most famous and valuable cat s eye gemstone is chrysoberyl cat s eye.
Cat s eye gemsona. The needle like inclusions in the stone must be perpendicular to the stone and thus a very experienced and skilled lapidarist is required to cat s eye the effect of cat s eye. When the speaker is referring to any other gem with a cat s eye the name of that gem is used after the words cat s eye. In fact when the term cat s eye is used alone in the gem trade it always refers to chrysoberyl cat s eye.
Cat s eye describes a gemstone polished into a cabochon that displays a narrow band of concentrated light going accross the width of the stone. This effect known as chatoyancy or cat s eye effect is caused by inclusions of fine slender parallel mineral fibers in the gemstone that reflect light in a single band. The gem should be cut in an oval or round shaped dome like structure which is known as cabochon cut and is polished in a way which clearly exhibits chatoyancy.
This particular quality is termed chatoyancy. Chrysoberyl is the gem that exhibits the finest cat s eye when the name cat s eye is used alone it is understood that the speaker is referring to a cat s eye chrysoberyl. The chatoyant effect is due to minute parallel cavities.
Precious or oriental cat s eye the rarest and most highly prized is a greenish chatoyant variety of chrysoberyl called cymophane.
