NATURAL SIRI LANKAN ZIRCON 1.09 cts Dimension 6.2x4.9x3.4 mm. Clarity Si 3. This material was derived from gem gravels in the Ratnapura district (Dahanayake and Ranasinghe, 1985). Zircon is an underrated but magnificent gemstone. When it is properly cut, it rivals diamond in beauty, but often the cutting is not correct and the gem is relatively dull and lifeless. The dispersion is very high, close to that of diamond. Zircon is very brittle and edges of stones are easily chipped and abraded. Zircon must be worn carefully to prevent damage. The range of color in the material is wide, and many additional colors are produced by heating. (We use DHL registered Singapore post and Australia post all items are posted in Australia.) Disclaimer. We use natural sunlight when we can. We also use lights that produce as close to possible natural daylight. We use photo shop to cut and edit but not to enhance. We also know many computer screens buyers use, vary greatly along with their eye sight. You get the products we sell at a very good price because we buy in bulk. Gems and opals especially need light sometime strong to see their wide ranges of colors and color play So make sure you have a good source of light when examining them. Cheers and thanks for your support.