5.00 carat Lightning Ridge black crystal oval opal​​​​​​
 
Excellent oval cut black crystal opal from Lighting Ridge, cut with a low dome this 5 carat stone looks much bigger.  Body is crystal full of blue fire.  Could be set any way.
 
Mine - Lightning Ridge - Australia
Body Tone - N4 crystal
Brightness - 4/5
Fire colour - Blue
Size - 16x13x3.7mm
Weight - 5.00
 
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.