The best sapphire should be "cornflower", which refers to the color of precious stones, but the blue is slightly purple, like the color of blue velvet. In addition, there must be no impurities and be transparent. This kind of sapphire is also very expensive. First of all, the name of "strange sapphire" does not conform to the state regulations, which prohibit naming gems with names that are easy to confuse consumers, such as land names and personal names. There is no way to say whether what you said is true or not. Even if it is true, there is a difference between synthesis and nature. If it's two colors, it should be fake. 4*6mm, 10, a few hundred dollars should not be available. If a gem looks transparent and its interior is clean, it is synthetic. Natural gemstones have many impurities and are not very transparent. Let me give you a piece of advice. At any time, jewelry is worth a penny, and there is nothing cheap to touch. This is absolute. Besides, sapphire belongs to one of the five most precious gems in the world. Merchants generally use 18K gold inlay, while foreign countries use 14K or 9K gold inlay. Nothing inlaid with silver will be a very good gem, and the materials are well matched. So if you don't know anything about jewelry, just look at whether his workmanship is exquisite and whether the tin foil used is good, and you can probably know the grade of this gem.