Iolite gems have a violet-blue color, the gemstone is not the same as tanzanite but, medium color iolite stones can at times closely resemble the more expensive tanzanite gemstone. The IOL-01 is a large iolite gemstone from Directstones, the 14mm x 10mm dimensions for this big iolite stone make it perfectly suitable for a mens iolite ring. You can ofcourse choose to have this oval iolite gem set in a gorgeous pendant too. Custom cut gems available from Directstones can accomodate all your requirements in terms of gem types, gem shapes and gem sizes. Get more information on iolite stones at http://www.iolite.directstones.com/iolite-gemstones-01.htm