Koroit Boulder Oval Opal 1.70crt - OPL168
 
Oval Koroit Boulder opal Cabochon with a medium dome, green, blue and red fire pattern.
 
Ideal ring or pendant stone
 
Mine - Koroit Boulder
Body Tone - Iron Stone
Brightness - 4/5
Fire colour - Green Red Blue
Size - 9x6x3.5mm
Weight - 1.70 carats
 
About Opals
 
Lustre: 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.