Painful Pleasures sells a variety of jewelry with opals. You can buy the opals loose or as part of a jewelry set. The opals are generally a synthetic opal, made in Japan, and made up of the following: Synthetic Stabilized Opal Elements: 80% SiO2.nH2O + 20% ResinHardness (Mohs): 4-5 Specific Gravity: 1.80-1.90 Heat Resistance: 130ºC Rough Opal Thickness: 14-18mm You can see the Opal Jewelry Selection in our Retail Store (any size order), Wholesale Store ($100+), or Distributor Store ($500+) We offer the following opal options (Please Note: Some listings may not have all these opal options, refer to individual product descriptions & drop-downs for options available for each product):