The scale of China's colored gemstone market has grown from RMB 20.00 billion in 2013 to RMB 31.86 billion in 2017, with a compound annual growth rate of approximately 12.3%. According to the forecast of authoritative institutions, the market size of colored gemstone jewelry is expected to reach 53.08 billion yuan in 2022, and the compound annual growth rate from 2017 to 2022 is expected to reach 10.7%, and the growth rate is optimistic. In the current market, in addition to the three precious gemstones of ruby, sapphire and emerald, other potential colored gemstones have also entered a period of rapid development. A systematic understanding of the identification and grading evaluation of colored gemstones is more conducive to judging the value of gemstones and grasping the development trend of colored gemstones.

With its brilliance and rarity, ruby and sapphire have been widely used in the jewelry decoration of European royal families since the Middle Ages. In recent years, ruby and sapphire have appeared frequently in the auctions of major colored gemstones, and their attention has been increasing. As two important roles in the five precious gemstones, ruby and sapphire are not only the main jewelry purchased by consumers, but also an important asset for people's collection and investment. However, both the origin and treatment of ruby and sapphire have a direct impact on the price of gemstones. Only by understanding the systematic identification, value evaluation and quality grading of ruby and sapphire, and mastering the frontier market and on-site mining information of ruby and sapphire, can we truly know ruby and sapphire and discover the value behind them.

Emeralds have long been famous as ancient precious gemstones. The time for it to enter the Chinese market is not long, but the development is very rapid. In the short three years from 2015 to 2018, the domestic emerald wholesale market ushered in a blowout growth, with a continuous increase of up to 300%. As the fastest-rising precious gemstone, emeralds have attracted a large influx of practitioners. In the increasingly chaotic competitive situation, how to correctly appreciate emeralds? How to understand the emerald price from the perspective of color, transparency, clarity, cut and weight? How to distinguish between treated and synthetic emeralds? How to grasp the rhythm and trend of the market? These questions have plagued many emerald practitioners.