24.72 ct Great Flash Andamooka Matrix Opal SKU.5

Item Information

Dimensions (mm) 30 x 24.21 x 4.85mm
Weight (carats) 24.72 carats

Matrix opal from Andamooka, in South Australia, is a precious opal-included porous rock that is commonly color enhanced (carbon impregnated) to imitate the highly prized black opal from Lightning Ridge in northern New South Wales, Australia. This material has been commercially available since the mid-1950s and is often referred to as “sugar treated.” A basic sugar acid-carbonizing technique is used to carbonize, and thus darken, the cream-colored matrix of prepolished stones so that the play-of-color is more prominent. The carbon impregnator in treated Andamooka matrix opal can be readily identified with low-power magnification.

Origin: South Australia  

Treatment: Sugar-Acid Treatment

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Pricing & Details

Bid Increment $1
Starting Bid $98
Auction ID 705388
Watchers 0 watching
Viewed 126 times
Starts 18th May 2018 12:50pm PDT
Ends 19th May 2018 6:20am PDT

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