how to facet
gemstone main cabochon creation
mineral data
Mineral Name: danburite
Gem Names: danburite
Chemistry: Ca2B(SiO4)2
Class: silicate - tectosilicate
Crystal Sys: orthorhombic
Hardness: 7 - 7.5 Specific Gravity: 2.97 - 3.03
Fracture: conchoidal Refractive Index: 1.678 - 1.689
Dispersion: none
Misc Prop: Danburite is another of the collector gems more than a jewelry gem. Most of the cut material is water clear and is hard to differentiate visually from clear topaz.

It is named for its first locale, Danbury, Connecticut. It does exist in brown and yellow varieties but the clear is the color found in most cut stones.

I currently have no finished danburites in my collection, but have included some photographs of the rough.

Specific Images:
facet grade danburite
large typical dandurite crytal
not facet grade