Spessartite Faceting Information
A guide to Spessartite Faceting Information. Essential information on Glass faceting that includes tips on cuts and polishes together with helpful details.
Color: Orange to red brown
Moh's Hardness: 7-7.5
Refractive Index: 1.79-1.81
Critical Angle: 33.96°
Specific Gravity: 4.12-4.20
Heat Sensitivity: Slightly
Birefringence (double refraction): 0.027
Crystal Structure: Isometric, rhombic, dodecahedron,icositetrahedron
Treatments: Generally none
What I prefer to polishing with: Alumina oxide with a tin lap (scored).
Jeff's Comments: Most Garnets cut and polish pretty easily (with the exception of a piece with bubbles/flaws) and are really not much of a problem. Pre-polish with a 1200 steel (not Nu Bond, it will leave orange peel) and polish with tin lap.
Design Notes: Most of the orange/brown/red types of Garnet are saturated and I prefer checker boards and bar cut in them. On lighter Grossular Garnets and Mail types of Garnets I prefer a deeper design.
Garnet Value, Price, and Jewelry Information
How Do Garnets Form?
Top Spots for Gem Hunting in the US
Void Reaver Gem Design for a Lab-Created Alexandrite
D20 Gemstone: a Dungeons and Dragons-Inspired Design
Variscite Value, Price, and Jewelry Information
Interview with Justin Prim and Victoria Raynaud: The Dynamic Duo That Built a Multifaceted Business in the World of Gems
When you join the IGS community, you get trusted diamond & gemstone information when you need it.
Get started with the International Gem Society’s free guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!