Approximate Size Range: from 9x7mm up to 18x12mm. The size of any particular stone can be roughly estimated from the photo where the stones are laid out on a grid. Grid Sizes: 27mm High x 27mm Wide. The item "One Wholesale Lot of 70 Pieces Australian Boulder Opal Matrix Cabochons" is in sale since Saturday, May 11, 2019. This item is in the category "Jewellery & Watches\Wholesale, Bulk Lots\Gemstones, Loose".The seller is "shop_surfsands" and is located in Sydney, NSW. This item can be shipped worldwide.