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BIRTHSTONES & ANNIVERSARIES
Opal is an October birthstone and the 14 year wedding anniversary.
REFRACTIVE INDEX: 1.37-1.47
SPECIFIC GRAVITY: 2.15 (+0.08, -0.90)
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Pearl is a birthstone for June, along with moonstone and alexandrite. Pearl is also the gemstone for the 30 year wedding anniversary.
MINERAL: Calcium Carbonate
COLOR: White, black, gray, yellow, orange, pink, lavender, green, blue
REFRACTIVE INDEX: 1.520 to 1.690
SPECIFIC GRAVITY: 2.60 to 2.85
MOHS HARDNESS: 2.5 to 3.0