12.50 carat Lightning Ridge Rub Rough Opal - EO-272
 
Stunning top grade piece of L/R rough opal.  Will cut a good sized opal with a strong red, green, blue fire pattern. Black base under the white cap.
 
Source - Lightning Ridge
Size - 20x14x10mm
Weight - 12.50 crts
Base Tone - N7 and N4
Fire Colour - Red Green Blue
Brightness - 4.5/5
 
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.
 
All orders are sent recorded delivery UK and International.