Yttrium Aluminum Garnet Faceting Information

Yttrium Aluminum Garnet Faceting Information

Yttrium Aluminum Garnet (YAG)

YAG/yttriumColor: Wide range of colors available.
Moh’s Hardness: 8.5
Refractive Index: 1.833
Critical Angle: 33.12°
Specific Gravity: 4.55
Cleavage: Imperfect
Fracture: Conchoidal
Dispersion: .028
Heat Sensitivity: Slight
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.