Benitoite Specimen.
Benitoite Specimen.

Gemological Information for Benitoite

Color:Blue or Violet Blue, Rarely Colorless or Pink
Crystal Structure:Hexagonal
Refractive Index:1.757 – 1.804
Hardness:6 to 6.5
Similar Stones:Azurite, Sapphire, Synthetic Sapphire
Treatments:None Known at this Time
Country of Origin:U.S.

Benitoite Care

Ultrasonic Cleaning:Risky
Steam Cleaning:Never
Warm Soapy Water:Safe
Chemical Attack:Attacked by Hydrofluoric Acid and Slowly Slowly Affected by Hydrochloric Acid
Light Sensitivity:Stable
Heat Sensitivity:No Rapid Temperature Changes
Further Resources
Gems & Gemology: The Quarterly Journal of The Gemological Institute of America.


  • Summer 1953, Benitoite, by Ehrmann, p. 317, 1p.
  • Summer 1963, A Beautiful 4 1/2-ct. Benitoite and a Colorless Benitoite, p. 55, 1p.
  • Spring 1968, Pink Benitoite from Calif., p. 284, 2pp.
  • Spring 1968, Benitoite Inclusions, p. 285, 2pp.

Online Texts on Benitoite:

  • 1907, Benitoite, A New California Gem Mineral, by G. D. Louderback, Univ. of Calif. Geol. pub., Vol. 5, #9, pp. 149-153
Close Menu