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This Australian Loose Boulder Opal is 

of impressive 5.50ct (19mm x 12mm x 4mm)
from Winton, Queensland
displaying the superb & truly unique spectrum of colours: 
from striking Indigo & Sky Blue 
to superb vivid Emerald Green 
The beauty of this spectacular opal is truly dazzling, 
particularly under different lightings: the gem displays the most magnificent spectrum
The gem can be set in precious metals & turned into a piece of jewelry (pendant for example) - 
please message us for details! 
Australian Boulder opal is the second most valuable type of opal. 
Mined from the large ironstone boulders under the ground, 
boulder opals are easily recognisable by the layer of solid brown ironstone on the back fo the stone. 

Magnificent Australian Loose Black Boulder Opal of 5.50ct. 19mm x 12mm x 4mm.

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