The Gemstone Danburite

Colorless Oval Danburite

Danburite is primarily a collectors gemstone. It is usually colorless; yellow and light pink gems are seldom cut. Danburite is named after the city of Danbury, Connecticut, where this mineral was first described, though no gem grade material has come from Danbury. Danburite has good hardness and facets well, but its lack of fire in colorless stones limits its use as a mainstream gemstone.


? Colorless, Yellow, Pink


? 7

Chemical Formula

? CaB2Si2O8

Mineral Class

? Danburite

Additional Properties

Crystal System
? Orthorhombic
Refractive Index
? 1.63
Double Refraction
? -.007
? Transparent
? 2.9 - 3.0
? Vitreous
Cleavage ? 1,1


? Danburite is a collectors and connoisseur's gemstone, and is not used in mainstream jewelry items.

Treatments & Enhancements

? Danburite gemstones are natural and not heated or enhanced.

Danburite Sources

? The primary source of gem-grade Danburite is Mexico, specifically at Charcas, San Luis Potosi. Other sources include Russia, Japan, Burma, Madagascar, and Bolivia.

Similar Gemstones

? White Topaz, Phenakite, and White Sapphire are harder, though Quartz Rock Crystal may appear similar.

Danburite Photos


Danburite in the Rough Photos



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