Danburite Facet / Faceting Information

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Danburite Facet / Faceting Information


White Asterism in Danburite facet

Color: Colorless, pink, wine-yellow and brownish.
Moh's Hardness: 7
Refractive Index: 1.63-1.636
Critical Angle: 37.84°
Specific Gravity: 3.0
Cleavage: Imperfect
Fracture: Uneven, conchoidal
Dispersion: .017
Heat Sensitivity: Yes in my experience
Birefringence (double refraction): Weak (.006)
Crystal Structure: Orthorhombic

Treatments: Generally none, sometimes can be irradiated.

What I prefer to polishing with: 8,000 pre-polish 50,000 polish with Zinc laps (scored)

Jeff's Comments: Cuts and polishes pretty easily, and can be a little tough to polish sometimes. It seems to grab diamonds and can scratch. Watch the heat when dopping.

Design Notes: About any designs will work well. I like deep designs because the color(s) are usually on the light side

Design Links: White Asterism - This is great for clear rough if you have a piece that will work.

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.

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