Cat's eye quality evaluation factor

Among colored stones, gold emeralds are more expensive gems than rubies, sapphires, and emeralds. Gold emerald with cat's eye effect is a very precious precious gem, which can be called "cat's eye" directly. The cat eye effect of the cat's eye gemstone is mainly due to the presence of a large number of small, dense, parallel-arranged filament-like rutile mineral inclusions in the interior of the gold emerald mineral. The arrangement of the filaments is parallel to the direction of the c-axis of the gold emerald mineral crystal. After special orientation grinding, the light incident on the inside of the gemstone is reflected by the inclusion body, and the emitted light is concentrated into a light band to form a cat's eye phenomenon. The quality and price of the cat's eye depends on its color, quality and the perfection of the cat's eye. The cat's eye gemstone is centered and straight with a light band, and the light band is clear, and it can be freely moved as the gemstone rotates. The higher the transparency, the less the cat's eye effect is, and the weaker the color, the weaker the cat's eye effect. The color of the cat's eye is best with beeswax, and the second is dark yellow and dark green. The lighter the color or the brownish tone, the lower the price. In general, the greater the quality of the cat's eye, the higher the price. The origin of opal is mainly in Sri Lanka, and the price changes greatly. Usually at $100/ct or more. The high quality cat's eye of 3-5ct is 1500 USD/ct, the medium quality is 500-1000 USD/ct, and the low grade is 200-500 USD/ct. Cat eyes above 5 ct are generally higher than $1,000/ct, and good for $2,000/ct.

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