On the market more common red ruby red spinel, garnet, tourmaline, such as varieties, appearance and natural ruby very similar:
Red spinel: spinel is red or pink color one, good diaphaneity and turn the spinel, observations from different directions and no color depth changes, and not under fluorescent light luminance.
Red garnet: garnet color one is maroon, fainter, gloss is not strong. No light and shade change under polarizer, ruby red fluorescence under ultraviolet fluorescence, however the garnet inert, absorption spectrum is different from the ruby garnet.
Red tourmaline: red tourmaline is one kind of similar to ruby gem, the more show copies of dense brown in color, refractive index difference is one kind of effective way to distinguish them.
13 test sample are: jade, amber, hetian jade, topaz, pearls, agate, sapphire, emerald, coral, Tanzania stone, opal, chalcedony, turquoise, glass, jade, etc.
Finally, the IGTC expert warns customer, for most ordinary investment collectors, if do not have the relevant knowledge of professional identification, it is difficult to identify, so when the choose and buy should be more cautious, before buying please detailed identification of professional quality inspection institutions and issue the certificate (such as NGTC certificates, etc.), for formal invoice at the same time, to safeguard their own rights and interests.