Glossary of Terms

1. S (Silica - Synthetic alexandrite)
2. T (Thermochroism - Trichroism)
3. U (Ultramafic - Ultraviolet microscope)
4. V (Vacuum fluorescence display - V-shaped inclusions in corundum)
5. W (Water of crystallization - Weight of gemstones and precious metals)
6. X (X-ray - X-ray spectrum)

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