Opal Type: Black Opal 

Shape: Oval 

Opal Weight (ct): 10.91 ct

Dimensions (W x L x H):
15.8 x 20.1 x 4.7mm
(approx. 5/8 x 13/16 x 3/16 inch)

Colour Intensity: Bright

Dominant Colours: Blue, Purple

Pattern: Broad Flash, Foil Flash

Origin: Lightning Ridge, Australia