Switzerland is recognised worldwide for its precious metals refineries - these refineries maintain some of the highest world standards for platinum bars worldwide. Platinum bars are produced by four main refineries in Switzerland - Argor-Heraeus, Valcambi, PAMP and Metalor. Argor-Heraeus also produce platinum bars for UBS, and Valcambi produce them for Credit Suisse. Swiss platinum bars meet all international standards for investment grade platinum bullion, and are recognised by the LBMA and the COMEX as well. Each bar has a minimum fineness of 999. Swiss platinum bars are available in sizes ranging from 1 gram to 1 kilgoram, with 1 ounce and 100 gram platinum bars being the most popular sizes.