BIRTHSTONES & ANNIVERSARIES
Emerald is the birthstone for May and the gem for the 55th wedding anniversary.
REFRACTIVE INDEX: 1.577 to 1.583
BIREFRINGENCE: 0.005 to 0.009
Diamond is the birthstone for April and the gem of the 60th and 75th wedding anniversaries.
SPECIFIC GRAVITY: 3.52 (+/- 0.01)
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