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. Historically this gemstone comes from Afghanistan and this location was reported by Marco Polo as early as 1271, although the Romans already knew about and even the Bible refers to this aggregate of such a wonderful 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.
|Color:||Cobalt blue with white or golden patches (calcite and pyrite)|
|Similar Stones:||Sodalite, Azurite, Imitation Lapis|
|Country of Origin:||Afghanistan, Chile, Russia|
|Ultrasonic Cleaning:||Some Risk|
|Warm Soapy Water:||Safe|
|Chemical Attack:||Decomposition, effervesces, discoloration|
|Heat Sensitivity:||Darkens or changes color|