1. The refractive index of diamond is 2.40.
2. Cleavage in gemstones results from directional weakness in atomic bonding.
3. Dark field illumination is helpful in observing asterism effect in gemstones.
4. A gem material that contains absolutely no transition elements will usually be colorless.
5. The Chelsea filter test is especially useful for detecting chromium.
6. The most highly prized of all sapphire colors is blue sapphire from Kashmir, India.
7. As emeralds get lighter in color, their value decreases.
8. Padparadscha sapphire is a variety of pinkish orange sapphire.
9. In the GIA color grade scale, truly colorless diamonds receive a grade of “D.”
10. Lasering as an enhancement process is used to improve the appearance of diamonds.
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