Tuesday, June 10, 2014

Moonstone belongs to the mineral group of the feldspars, which comprise almost two thirds of all the rocks on Earth. The shimmer of light of the moonstone is referred to as 'adularisation'. The cause of it is the inner construction of the gemstone that causes light rays to be refracted and scattered in the stone.
Traditionally, the classical moonstones, almost transparent and with their bluish shimmer, come from Sri Lanka. However, they are also found in the USA, Brazil, Australia, Myanmar and Madagascar.
The more intense in colour, the larger and the more transparent, the more highly valued the moonstone.Because of their rarity, prices of bluish moonstones of good quality have risen exponentially.
For a few years, there have also been some green, brown and orange specimens on the market, as well as some with a smoky colour and some the colour of champagne, and some black and some reddish ones, mainly originating from India. Some have a cat's eye effect or a four-spoked star as well as the typical undulating shimmer of light.

In the photo, a fantastic dragonfly corsage of gold, enamel, chrysoprase stones, moonstones by Rene Lalique made around 1897 or 1898.

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