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BIRTHSTONES & ANNIVERSARIES
Emerald is the birthstone for the month of May. It’s also the gem of the twentieth and thirty-fifth wedding anniversaries.
- REFRACTIVE INDEX: 1.577 to 1.583
- BIREFRINGENCE: 0.005 to 0.009
- SPECIFIC GRAVITY: 2.72
- MOHS HARDNESS: 7.5 to 8