(6) Artificial rutile: Rutile is an ordinary natural mineral, and its composition is titanium dioxide. Because its refractive index (2.61~2.90) is higher than diamond (2.42), it is polished into a gem. Bright and dazzling flashes and rainbow-like changes can appear afterwards, which is very beautiful. It is a pity that almost all natural rutile is opaque, so it was only in 1947 that the American Lead Company produced artificial rutile. Among them, the colorless and transparent ones are used as diamond substitutes or counterfeit products. Their colorful flashes surpass real diamonds. They are often called “fancy diamonds” or “five-color diamonds”. However, rutile has a strong but strong refractive index. Like zircon, it can be seen from the top surface to the bottom ridgeline with a magnifying glass, which has a prominent double shadow, so it is easy to distinguish it from diamonds. In addition, the “multicolored diamonds” have a vulgar feeling because they are too bright and have an unclear milky white light. They are far less elegant and lovely than diamonds.
(7) Cubic zirconia (ie “Soviet diamond”): This is the most ideal diamond substitute crystal or counterfeit product first introduced by Russia. It is a man-made compound without natural minerals. Since the advent of cubic zirconia, a variety of other synthetic gem materials have only been used as substitutes for other low- and medium-grade gemstones, and are no longer used to polish fake diamonds. This is because cubic zirconia is very close to natural diamonds in terms of refractive index and dispersion. But its hardness is low (8.5), its density is 1.6~1.7 times that of diamond, reaching 5.6~6g/cm3, and its thermal conductivity is much lower than diamond, so it can still be accurately distinguished from diamond by instrument Come.
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