Wholesale Lot 24pcs Multi-color 30mm Gemstone Round Cab Cabochon For Jewelry Making QTY: 24pcs Randomly Mixed Cabochon Diameter: 30mm (1.2 inch), Cabochon Thickess: 7mm to 10mm Not all of them from same supplier, so thickness is varies, most cabochon has 7 to 8mm thick. Well polished, sized, shaped, flat on backside, good for setting We defined each material in picture, pls compare the ones you got with the 2nd picture. so you may know what stone you got. Do not hesitate to contact us if you are still not sure what you got. If any of them you got is defective or broken in transit, pls contact us for a partial refund or replacement.