Lapis Lazuli

Lapis Lazuli Pendant.JPG

Victorian Etruscan Revival Pendant/Locket/Pin with a Deep Blue Lapis Lazuli Cabochon.
Photo Courtesy of Lang Antiques.

Lapis lazuli is a rock aggregate made up from - predominantly - the minerals lazurite, sodalite, nosalite and hauyne. It has a typical cobalt blue color, often with patches of pyrite (golden) and/ or calcite (white). It was this rock which was powdered to create the ultramarine pigment used by painters prior to the 19th century[1]. Historically this gemstone comes from Afghanistan, a location reported by Marco Polo as early as 1271. It is thought, however, that the Romans already knew about Lapis and even the Bible[2] refers to an aggregate of the wonderful blue color. Another famous locality where lapis lazuli is mined is in the Andes mountain range of Chile.

Lapis lazuli is often mimicked by a dyed jasper, but it does not show the white and golden patches. Sodalite, one of the components of lapis lazuli, is often mistaken for it, but the color is much paler. There is also a sintered synthetic spinel which imitates lapis lazuli.

Dyeing and impregnation occurs on lesser quality gems and these can be easily removed by acetone. Leaving these stones in the sun for a too long a period of time will cause the dye or impregnation to stain the environment.

Lapis Lazuli Victorian Brooch.jpg

Victorian Eight-Pointed Star of Rose-Cut Diamonds Radiating from a Burmese ruby Center in a Lapis Lazuli Sky.
Photo Courtesy of Lang Antiques.

Gemological Information For Lapis Lazuli

Color: Cobalt blue with white or golden patches (calcite and pyrite)
Crystal Structure Rock
Refractive Index: ~1.50
Durability: Durable
Hardness: 5.5
Similar Stones: Sodalite, Azurite, Imitation Lapis
Treatments: Dying, imitations
Country of Origin: Afghanistan, Chile, Russia

Lapis Lazuli Care

Ultrasonic Cleaning: Some Risk
Steam Cleaning: Avoid
Warm Soapy Water: Safe
Chemical Attack: Decomposition, effervesces, discoloration
Light Sensitivity: Stable
Heat Sensitivity: Darkens or changes color


  1. Webster, 251
  2. Exodus 28:18

Sources Consulted

  • Gemmology Third Edition - Peter G. Read
  • Gems, Their Sources, Descriptions and Identification 4th edition - Robert Webster, B.W. Anderson

Online G&G Articles on Lapis Lazuli