What is an optical phenomenon? Plainly put, this term embodies the result of the way light interacts with the crystalline structure, inclusions, and/or internal structure of a gemstone. It is, in essence, the reflection, diffraction, absorption, and/or diffusion of that light. Without even knowing, we encounter these phenomena on a daily basis, whether in opal, moonstone, alexandrite, or cat’s eye chrysoberyl—that said, one should be careful not to confuse optical property, such as dispersion in a diamond, with optical phenomena.
Rubies in North America are so rare that these stones used to be only available to collectors; however, thanks to a new mine in southwestern Greenland, North American rubies are now being sold in jewellery stores.
Despite the recent terrorist attacks in Bangkok and the global economic slowdown, the 56th Bangkok Gems & Jewelry Fair (BGJF) still registered good visitor turnout. Some 11,000 people entered the show on the first day, keen on seeing the wares of some 2500 exhibitors and stocking up before the holiday season. While a definite showcase for Thai gems and jewellery, the event also featured a wide range of international exhibitors from dozens of countries around the world.