Please allow the 1-3mm error due to manual measurements 2. Because the natural products, Some of the products which will have a crack, so each one is different, we will give you the best that 3. Please be careful not to fall on the ground, or it will break! We will give you the best.This item is in the category "Collectibles\Rocks, Fossils & Minerals\Crystals & Mineral Specimens\Crystals". The seller is "tongchuang" and is located in this country: CN. This item can be shipped worldwide.