Danburite

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: Medium (.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...

Rough Links:
Danburite - Collector Danburite, white/clear in color

Cut Stone Links:
Danburite - Faceted Danburite

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E-mail to inquire or order: jeff@faceters.com