200ct 65x40 Solid Rough Treated Fairy Opal [FOS-0017]

Item Information

Dimensions (mm) 65 x 40 x 9mm
Weight (carats) 200 carats
Colors

Stone Type: Treated Fairy Matrix Opal Rough

Stone Weight: 200ct

Stone Size: 65 x 40 x 9mm

Origin:  Opalton  QLD, Australia

Color:  Red, Orange, Yellow, Green, Blue

Brightness: B3

Shape: Freeform

Treating is similar to used with Andamooka matrix opal but instead cooked in sugar and burn in acid this opal is only burned in oil to turn light brown base to black and enhance color. Treatment usually 1-2mm deep but may go deeper. Cutting deeper may cause brown base come to surface and has to repeat burning process.

Very porous base opal makes it hard to polish. Clear coat is commonly used to make top shiny.

https://www.opalauctions.com/learn/opal-information/history-about-andamooka-opal-and-how-to-treat-it

Picture and video taken stone wet to show full colour.

SOLID ROUGH TREATED AUSTRALIAN FAIRY MATRIX OPAL LOOSE STONE


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Pricing & Details

Bid Increment $1
Starting Bid $75
Auction ID 821433
Watchers 3 watching
Viewed 80 times
Starts 21st Oct 2019 3:15am PDT
Ends 26th Oct 2019 10:59am PDT

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