Coins have been used as a form of currency across the world for almost three thousand years. Much like today, the earliest coins were formed from metals, with more precious metals reflecting higher monetary value. The most common shape of coin is a flat, rounded disc shape, which also tends to be small in size. Antique and rare coins can hold high value on the collectors' market, and some coins produced by India can be of particular interest to numismatists. Under British rule in the 19th and early 20th centuries, coins were circulated throughout India with images of the monarchy. Mohurs - a type of British-Indian gold coin - from the 1860s feature the portrait of Queen Victoria, as well as other types of coins from this period and region. After the Indian independence in 1947, rupee coins began to be minted with the image of the State Emblem of India.