Cosmetics gold flakes are two types: genuine and imitation. The imitation can only be used on your skin and nails. As for the genuine flakes, they are made from 23k genuine gold leafs that are certified by the EU and US as edible and safe. Flake sizes: 1 is almost powder, 2 about 2mm, 3 about 7mm, and 4 is about 10mm. Size 0 is the largest about 2-5cm.