 Count Georg Ludwig Cancrin was the originator of platinum coins.The coins were made of untreated platinum (97%), and were minted from 1828 to 1845 with denominations of 3, 6, and 12 rubles.Such unusual denominations in Russia appeared for the convenience of coinage, their sizes was chosen to be the equivalent of a 25 kopeck, a half ruble coin, and one ruble coin, the amount of metal in the coins with the equivalent amount of metal.