in

Dumortierite Value, Price, and Jewelry Information

dumortierite - Nevada and California

Dumortierite is a beautiful and very hard material, eminently suitable for jewelry. The cabochon material is the only generally known form, since faceted stones are so rare. Fibrous inclusions have been noted in the transparent Brazilian stones.

The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

See also: Holtite.

Opticsa = 1.686; β = 1.722;γ = 1.723.

Brazil:  a = 1.668-1.673; β= 1.682-1.684; γ= 1.685-1.688. SG = 3.31-3.35.

Uniaxial (-), 2V= 13-56°.

Occurrence: In aluminous metamorphic rocks; in pegmatites.

Pershing County, Nevada: violet gem material. Arizona.

France; Madagascar; Brazil (Minas Gerais): facetable bluish-green material.

Sri Lanka: transparent, reddish-brown stones.

Comments: Dumortierite is a beautiful and very hard material, eminently suitable for jewelry. The cabochon material is the only generally known form, since faceted stones are so rare. Fibrous inclusions have been noted in the transparent Brazilian stones.

Name: After M. Eugene Dumortier, a paleontologist.

 

What do you think?

257 points
Upvote Downvote

Leave a Reply

Your email address will not be published. Required fields are marked *