Aquamarine, the Birthstone for March

The name aquamarine derives from the latin for “seawater”. A fine aquamarine is a blue to greenish blue and is completely transparent and has high clarity. More commonly the color lacks saturation and is a pale blue. Aquamarine is commonly found in large crystals and so large specimens are readily available. Aquamarine is the featured gem of the Brazilian Prarure, a set of matching aquamarine jewelry worn by Queen Elizabeth.

An unusual variety of aquamarine is the Cat's Eye Aquamarine, that displays a phenomena known as chatoyancy.

Birthstones and Anniversaries

Aquamarine is the 19th anniversary gem, and the birthstone for the month of March.

Physical qualities

Chemical Composition: Be₃Al₂Si₆O₁₈
Refractive Index: 1.577 to 1.583
Birefringence: 0.005 to 0.009
Specific Gravity: 2.72
Mohs Hardness: 7.5 to 8.0
Optic Character: Dichroic (near colorless and blue)

Buying Tips

Color: The finest color is a moderately strong dark blue to slightly greenish blue.
Clarity: Most aquamarine doesn't have inclusions that can be seen to the unaided eye.
Cut: The gem is readily available in all shapes.
Carat Weight: The gem is available in all size ranges.