Our jewellery are made from Sterling Silver and the stones are simulants to mimic diamonds, they are high quality Cubic Zirconia. The LUXY jewels are totally water resistant. However, we suggest to keep your silver pieces away from extreme humidity, any harsh chemicals (such as perfume, sulphur, chlorine or hairspray) to prevent oxidisation of the silver. Store your jewellery in an airtight container when they are not worn. 925 sterling silver will not change colour but silver can go darker - this can be repolished with a silver polishing cloth.