Actually, it's not a question of doping the diamond to look like a natural one -- it's of *not* doping it. Synthetic gemstones ("created" gems, as jewelers calls them, as most people think "synthetic" means "fake") are chemically treated so that they can be distinguished easily from natural ones. In reality, their purity tends to be a giveaway as well. Synthetic rubies in particular appear unnaturally clear and red, as natural ones are almost never that good.<br /><br />Random tidbit: there is a company that will create a diamond out of human cremains. (Cremains = ashes left from cremation.) You can send them a packet of your loved one along with a rather significant fee. They'll extract carbon from the ashes and turn it into a gem-quality diamond, cut the diamond, and mount it in a setting of your choice. It seems like slightly creepy jewelry, but it would certainly be a lasting tribute. <div class="Discussion_UserSignature"> <p> </p><p><font color="#666699"><em>"People assume that time is a strict progression of cause to effect, but actually from a non-linear, non-subjective viewpoint it's more like a big ball of wibbly wobbly . . . timey wimey . . . stuff."</em> -- The Tenth Doctor, "Blink"</font></p> </div>