Most common are so-called Green Sapphire Stone. The difference can be felt on a heat-sensitive part of the body because the glass feels warmer. Stone and mineral are placed next to each other for a short time to reach the same temperature. However, this test only works if it is a crystalline mineral. A simple thermal conductivity test helps distinguish between stone and glass. Round bubbles and often streaky structure indicate glass. Glass has a conchoidal fracture and has blurred or worn facet edges. While syntheses are more difficult to detect, the distinction between real sapphire and glass with magnifying glass and a little practice is possible. Many gemstones are in danger of being confused with glass. A careful study of the inclusions brings more clarity to distinguish real stones from syntheses. Even with a magnifying glass and experience, differences can hardly be detected. Other syntheses, which are more elaborate and expensive to grow, need more care to be unmasked. Green Sapphire Stone, which have been produced synthetically since 1904, are distinguished by glass bubbles and curved growth strips from the real stones. Polished stones are more commonly confused than rough stones. It is very similar to tanzanite and iolite. The likelihood of confusion with other blue gemstones, syntheses and glass is very large. Sapphire syntheses produced in mass production hardly differ from the real stones. The sapphire has been produced synthetically for over 100 years.
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