Verdelite and Chrome Tourmaline Faceting

Faceting Information such as guides, tips and tricks. Choose which tips best fit the criteria for Verdelite and Chrome Tourmaline faceting.

1 Minute Read

Verdelite and Chrome Tourmaline Faceting

Samurai in green Tourmaline/tourmaline faceting

Verdelite Tourmaline

Color: Green, to yellow/green, green/blue.
Moh's Hardness: 7-7.5
Refractive Index: 1.616-1.652
Critical Angle: 38.23°
Specific Gravity: 3.02-3.26
Cleavage: None
Fracture: Uneven, small conchoidal
Dispersion: .017
Heat Sensitivity: Not usually a problem
Dichroic: Strong (many color variations)
Birefringence (double refraction): Medium (.014-.024)
Crystal structure: Hexagonal

Chrome Tourmalien opposed bar

Chrome Tourmaline

Color: Chrome Green
Chrome Tourmaline is mined in Tanzania (Africa). Supply is sporadic, so is the pricing. But quality material is always in short supply and demands top dollar. It is seldom very large and generally when it is large it is too dark and not clean.

Treatments: Sometimes heated to lighten darker colors. Not much other treatment.

What I prefer to polishing with: Alumina oxide with a tin lap (scored).

Jeff's Comments: Cuts and polishes like any other Tourmaline, usually no problems. Orientation is important, go for the best color. The "c" axis on this material is often dark and must be orientated correctly.

Design Notes: About any Tourmaline design will work well, although I generally prefer a shallow checkerboard on darker rough. Use a design like my Smith Bar for dark axis material.

Design Links: Signature #4 - This is good for about any rough
Easy Emerald - This is a classic and works well on poor "c" axis colored stones
Smith Bar - This is a classic and works well on poor "c" axis colored stones

Jeff R. Graham

The late Jeff Graham was a prolific faceter, creator of many original faceting designs, and the author of several highly-regarded instructional faceting books such as Gram Faceting Designs.

Never Stop Learning

When you join the IGS community, you get trusted diamond & gemstone information when you need it.

Become a Member

Get Gemology Insights

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!