There is moderate thickness of coloured material beneath some of the potch. Weight (gm) : 238 Total Carat Weight (TCW) : 1190 Length (mm) : 108 Width (mm) : 97 Depth/Thickness (mm) : 20 Region : Lightning Ridge Cut / Shape : Freeform Main Stone Treatment : None Colour : Green. The item "Australian Gemstone Opal Rough Nobbies from Lightning Ridge RP00402" is in sale since Monday, April 29, 2019.This item is in the category "Jewellery & Watches\Loose Diamonds & Gemstones\Loose Gemstones\Opal\Black Opals". The seller is "opalshopaustralia" and is located in Elanora Heights. This item can be shipped worldwide.