12.80 carat Allens Rise semi black opal Marquise cut
 
Large Marquise cut Opal from the Allen Rise mine in south Australia. Rare to get a marquise cut especially in this size.  Body colour if full of blues and greens.  Will make a lovely pendant.
 
Mine - Allens Rise
Body Tone - N5
Brightness - 4
Fire colour - Green Blue Orange
Size - 34x14x4mm
Weight - 12.80
 
About Opals
 
Luster: Pearly, Vitreous, Opalescence
Birthstone zodiac sign: Libra
Associated month: October
Crystal system: Amorphous solid
Chemical formula: SiO₂·nH₂O
Hardness (Mohs hardness scale): 5.5 – 6.5
Country of origin: Australia, Ethiopia, Mexico and Cornwall amazingly 
Size variations: can vary 0.3mm each way on all dimension given
 
Properties:
 
In mystical circles, opal is considered a stone representing hope, innocence and purity. It has strong connotations of happiness, faithfulness, loyalty and confidence.  Regarded as a powerful sea stone for safety on the water.
 
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