dumortierite - Nevada and Californiadumortierite - Nevada and California

Dumortierite Value, Price, and Jewelry Information

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.

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HomeGemstonesDumortierite Value, Price, and Jewelry Information
By Joel E. Arem, Ph.D., FGA

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.

dumortierite - Nevada and California
DUMORTIERITE: Nevada (~2 inches across); Ogilby, California (~1 inch across). Photo © Joel E. Arem, PhD, FGA. Used with permission.

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Dumortierite Value

See also: Holtite.

Optics:  a = 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.

Joel E. Arem, Ph.D., FGA

Dr. Joel E. Arem has more than 60 years of experience in the world of gems and minerals. After obtaining his Ph.D. in Mineralogy from Harvard University, he has published numerous books that are still among the most widely used references and guidebooks on crystals, gems and minerals in the world.

Co-founder and President of numerous organizations, Dr. Arem has enjoyed a lifelong career in mineralogy and gemology. He has been a Smithsonian scientist and Curator, a consultant to many well-known companies and institutions, and a prolific author and speaker. Although his main activities have been as a gem cutter and dealer, his focus has always been education. joelarem.com

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