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Gemstones ABC
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A
- Strawberry Quartz B
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C
- D - F
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G-H-I
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P - Q
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S
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V - Z
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A
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Jewelry
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Rings
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Ringsizes
- 3.5 / G
- 4 / H
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- 5 / J 1/2
- 5.5 / L
- 5 ¾ / L ½
- 6 / M
- 6.5 / N
- 7 / O
- 7.5 / O ½
- 7.5 / P
- 8 / Q
- 8.5 / Q-Q1/2
- 9 / R 1/2 - S 1/2
- 9 ¼ / S ½
- 9.5 / S 1/2 - T
- 10 / T½
- 10-10.5 / T 1/2 - V
- 10.5 / V
- 11 / V 1/2 - W
- 11 / W
- 12
- 12 / Y
- 12.5 - 13 / Y 1/2 - Z+1
- 13.5 / Z+1 - Z+2
- 13 3/4 - 14 / Z+21/2 - Z+3
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Opal
Formula: SiO2 · nH2O
Color: Colorless, white, yellow, red, orange, green, brown, black, blue
Shine: Glassy, waxy, greasy, dull
Hardness: 5½ - 6½
Specific gravity: 1.9 - 2.3
Name: the origin of the name is uncertain. It can be from Sanskrit "upala", meaning "stone" or "precious stone" or from opal, the ancient Latin name for the jewel.
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