Brazilian opals are the most stable opals in the world so perfect investment the chance for cracking crazing or what so ever is almost nothing because the have less water the other opals and you can put them in water and the color stay Natural Opal Brazilian Untreated WEIGHT 7.70 CT SIZE 8 to 11 mm about multicolors freeform MINE: horca, Pedro II, state Piaui Beautiful color Lamp light condition. the piece for sale is what you see in photos! please be careful with the description and measures Standard shipping ( 2-7 days for Italy ) ( 10-20 days for Europe ) ( 15-40 days for rest of the world )