Aquamarine Facet / Faceting Information


Aquamarine Facet / Faceting Information

Aquamarine (Beryl)

Signature #4 in Aquamarine/aquamarine facet

Color: Light blue to blue-green
Moh’s Hardness: 7.5-8
Refractive index: 1.57-1.60
Critical Angle: 39.87°
Specific Gravity: 2.65-2.75
Cleavage: None
Fracture: Conchoidal, tough
Dispersion: .014
Heat Sensitivity: Can be, usually not a problem
Dichroism: weak
Birefringence (double refraction): Weak (.006-.009)
Crystal Structure: Hexagonal

Treatments: Aquamarine is often heat treated to reduce the green/blue color and improve the blue color. It is generally safe to assume most rough has been heated.

What I prefer to polishing with: Cerium oxide with a Spectra Ultralap.

Jeff’s Comments: Cuts and polishes like any other Beryl, usually no problems. I like to use a 1200 Nu Bond lap for pre-polish, it makes the polishing stage faster and easier. Orientating on the “c” is slightly better. Watch for silk and lilly pad type of inclusions perpendicular to the “c” axis.

Design Notes: About any design will work well. I prefer a deeper design and often cut Barions.

Design Links: Signature #4 – This is one of my favorite cuts in Beryl
Blue Ice – Designed for very long crystals

Gram Faceting Archive of Information
This edited version of an article by the late Jeff Graham is part of a special archived informational series from Gram Faceting. Used with permission.