This ornament is not only a beautiful addition to any collection, but also makes for a fun and thoughtful gift. Carnelian (or cornelian) is a reddish-brown mineral which is a variety of the silica mineral chalcedony, coloured by impurities of iron oxide. The colour can vary greatly, ranging from pale orange to an intense almost-black colouration.Tumblestones are created by tumbling and polishing rough crystal pebbles to reveal their natural colour and beauty. This finish gives the stones a lovely soft feel which makes them perfect for meditation, display or simply is a nice object to hold in the hand. Sold as single stones.