Marcasite in reality are pyrite (an ore of iron) which is cut and polished like a gemstone, giving it a lot of shine and sparkle. Marcasite jewellery became popular in Europe, as an alternative to diamonds in the 18th and 19th centuries, but is now worn the world over. The small cut & polished marcasite gemstones are set in silver and they give a diamond like sparkle with movement under lights. Marcasite sometimes also mis-spelled as mercasite. Buy Marcasite jewellery online from our wide collection of rings, earrings & bracelets all made in 925 sterling silver.