Contemporary Jadeite Testing

Posted on September 5, 2012 by Dominic Mok, MSc., FGA, FGAA, DGA Principal of the Asian Gemelogical Institute and Laboratory Limited, Hong Kong (AGIL)

Jadeite is a sodium aluminum silicate mineral which has a polycrystalline structure. The hardness is 6.5-7 on the Mohs’ scale, the average specific gravity value is 3.33, and the refractive index is approximately 1.66. The various colours of Jadeite are caused by the presence of chromium, iron and/or manganese transitional elements.

The Hong Kong jewellery trader has classified the nature of Jadeite (also known as Fei Cui Jadeite Jade) into four types:

Type A: Natural jadeite that has not been subjected to any form of chemical treatment to alter the appearance and structure of the stone.

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