18.13ct Welo Ethiopian Opal with Tight Color Pattern slice Measurement: 47mm x 33mm x

Measurement: 47mm x 33mm x 17mm

Measurement: 94mm x 88mm x 54mm

Measurement: 121mm x 82mm x 35mm

Measurements: 115mm x 65mm x 60mm

but according to a study done by Gem-A (The Gemmological Association of Great Britain)

18.13ct Welo Ethiopian Opal with Tight Color Pattern slice Measurement: 47mm x 33mm xWelo Ethiopian hydrophane opal mineral specimen with an amazing play of color. Not only that, but this piece is very fine cutting material that will have a great yield. We recommend that this opal material NOT be submerged in water (unless it is being cut, water will keep it cool), and it should never have any oils applied to it. Also, due to the hydrophane nature of this opal, the weight can vary slightly with humidity. We consider this to be a