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Opal Gemstone Information
Information * Loose gemstones * Jewelry links

Opal is a birthstone for the month of October and the gemstone representing the 14th and 18th wedding anniversary. In ancient times, opal was recognized as a symbol of faithfulness and confidence. The brilliantly colored opal was said to have magic powers because of its play of many colors. It was known to strengthen eyesight, protect against contagious diseases, ease sadness, and turn pale in the presence of poison. Opal symbolizes magic, love, hope, happiness, and truth.

Click to view AGTA code.

Refractive Index 1.45
Hardness = 5-6.5
Specific Gravity =2.15
Species - Opal.
Optic Character - Single Refraction, Aggregate Double Refraction-Common.
Phenomena - Play of color.

Ultrasonic: Never
Steamer: Never
Heat: Very poor; may cause cracking
Chemicals that harm: Hydrofluoric acid

Crystal Structure
Opal crystal matrix image.
Crystal system: Amorphous. Kidney or grape shaped aggregate.

 January  Garnet
February Amethyst
March Aquamarine
April Diamond
May Emerald
June Pearl/Alexandrite
July Ruby
August Peridot
September Sapphire
October Opal/Tourmaline
November Topaz or Citrine
December Blue Topaz or Zircon
Cabochon is the popular cut used in jewelry for opals.
Cabochons are smooth polished surfaces not faceted.

Common Cut Examples.
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