Gadolinium Gallium Garnet Facet / Faceting Information


Gadolinium Gallium Garnet (GGG) Color: Colorless, yellow, green, blue, pink, purple, red and orange
Moh’s Hardness: 7
Refractive Index: 1.97 – 2.02
Critical Angle: 30.51°
Specific Gravity: 7.02
Cleavage: None
Fracture: Conchoidal
Dispersion: .045
Heat Sensitivity: Low
Birefringence (double refraction): None
Crystal Structure: Isometric

Treatments: None

What I prefer to polishing with: Tin lap with Alumina oxide. Zinc laps with 8,000 pre-polish and 50,000 polish.

Jeff’s Comments: Cuts and polishes like Garnet. It is quite pretty especially in clear and light colors.

Design Links: 4-Way Stop – This is great for saturated rough if you have a piece that will work in the shape…
Princess – Nice in about any material
Brilliant Pear – Good in any color

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.