The Market Capitalization of Platinum is currently arround $232.97 B.
This value was obtained by multiplying the current platinum price ($931.90 per ounce) with the total amount of platinum that has been mined so far.
CompaniesMarketCap estimates that as of 2020 around 250,000,000 ounces of platinum have been mined.
This estimate is based on data from Statistica and matthey.com