There are many varieties of sapphire and imitation sapphire currently on the market. In addition to natural gemstones from different places, there are thermal diffusion methods to optimize sapphire, synthetic sapphire and natural blue gemstone similar to sapphire. Their appearance is very similar and needs to be carefully identified.
Thermal diffusion optimization sapphire: thermal diffusion optimization sapphire was successfully tested in the United States in the 1970s, mass production in Thailand in the 1990s, and entered the Chinese market in 1993. The gemstone optimized by this thermal diffusion method is called “Chin diffusion sapphire†and “American sapphire†in the sales process, and is called “Thai sapphire†in China.
This gemstone is mainly from Thailand. It is a colorless, milky white sapphire produced in Sri Lanka and other places. After being polished into a cross-section gemstone, it is placed in a baking material with a tantalum and iron oxide in a high-temperature heating (1750 house). ), the pigment ions of the blue such as iron and iron are diffused from the surface of the gemstone to form an indigo blue shell attached to the gemstone, and then the final polishing treatment is performed.
Synthetic sapphire: Synthetic sapphire is produced by traditional flame melting methods, including synthetic transparent sapphire and synthetic star sapphire.
Synthetic transparent sapphire. Synthetic transparent sapphire is generally uniform in color, transparent, and clean inside, making it difficult to see the internal flaws with the naked eye. This synthetic transparent sapphire is only placed in a tray filled with water, and a curved growth line with a blurred boundary is observed with a 20-fold magnifying glass, and a straight or angled ribbon of natural sapphire is not seen. Sometimes small melting points that have not yet melted can be seen.
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