Opal shot auction where fast?

Opal shot auction where fast? Opals shot auction where fast? Cat eye effect with a gem of a lot. The gold emerald gem scholars called opal stone opal cat eye effect has, said opal general refers to chrysoberyl cat's eye stones, and other precious stones, cat's eye effect has to be before the "cat's eye" word plus gem name, such as cat aquamarine, tourmaline cat's eye and so on. Strictly speaking, "Cat's Eye" is not the name of gems, but some kind of optical phenomenon gem presented. That is ground into hemispherical a gem bright light, the surface will appear bright reflection of a low height, called "cat's eye Flash" or "cat living light", and then depending on what gem is named, if gems are quartz, is called "quartz cat's eye", if it is gold emerald, is called the "Golden Green Cat's Eye." Stone Types cat may have a lot of flash, according to statistics possibly as many as 30 species, more common on the market in addition to quartz and gold cat green cat's eye, there are "pyroxene cat", "aquamarine cat's eye" and so on. Because most famous and most valuable gold green cat's eye, it is customary it referred to as "cat's eye", others are not so called cat's eye. Opal is chrysoberyl (Chrysoberyl) one in mineralogy, a gold emerald group minerals. Chrysoberyl containing beryllium aluminum oxide, a chemical formula BeAl2O4. It belongs to orthorhombic. Crystal form often has a short columnar or plate. Opal has a variety of colors, such as honey yellow, brown yellow, wine yellow, brown, green, brown, gray-green, of which the most valuable honey yellow. Transparent to translucent. Glass to the oil sheen. Refractive index 1.746-1.755, birefringence 0.008-0.010. Dichroism obviously, the dispersion 0.015, non-homogeneous body. Hardness of 8.5, a density of 3.71-3.75 g / cc. Conchoidal fracture. Yellow opal ball opal gem opal and other similar, the difference between artificial cat's eye. Nature cat eye effect can produce gems as well as tourmaline, beryl, apatite, quartz, kyanite, etc., but not as precious gold green cat. Tourmaline Cat's Eye: hardness smaller, 7-7.5, density 3.06 g / cc, the refractive index of 1.624-1.644. Quartz cat: low hardness, 6.5, density, 2.78 g / cc, refractive index as small as 1.44. Artificial cat: Glass fiber caused by the artificial opal, have brown yellow, blue and red. But artificial opal also appear in the top 2-3 arc bright band, natural opal appears only a bright band. Use a magnifying glass to see the artificial opal hexagonal honeycomb structure, low hardness, is about 5, small density was 2.46 g / cc, refractive index 1.44. Opal shot auction where speed: to promote the Chinese culture antiques, antique collectors to promote the development and prosperity of the market, to better protect the country's cultural heritage, "; Tibetan friends, cultural heritage, and common development"; for the purpose. In strong support of leaders at all levels Shanghai Folk Culture Park will hold a ten-day antiques event, warmly welcomed throughout the country antique operators and collectors visit. Specific arrangements are as follows: First, the organizers Shanghai International Auction Co., Ltd. Shanghai ClearWorld antiques and paintings Identification Center Second, schedule Auction: November 28, 2012 --12 月 8 th (ten days) Third, the General Assembly address Yan'an Hotel four Five exhibition booth 1, fine hall, exhibition scope porcelain, jade, jade, purple, paintings, stamps, ivory, ink stone, rare books, gold and silver, statues, stamps, tickets, jewelry, furniture, miscellaneous: each Collection Exhibit 300 yuan / 10 days; and where I want to send the exhibition, please send to my company holding the spot identified to achieve the participation conditions or formalities immediately collections send pictures to e-mail 450377870@qq.com, stated: " participate antique Conference ", including your name, phone number, address, we will respond to you in the same day. 2, the outdoor stalls Showcase: 500 per session / 10 days; ● Call Phone: 18817610809 E-mail 450377870@qq.com