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The chromium-containing members of the garnet family are emerald green because of the chromium content, and their value is much higher than that of the brothers of the same family. It has become a upstart in green gems. For example, the chrome garnet cheap promise rings, which is called "Sanjiang Emerald" in the Chuankang area of ​​China, contains 1% to 2% chromium. Another demantoid known as "one of the most beautiful gems discovered by humans", because its composition of Fe3+ in andradite is replaced by Cr3+, Its beauty level is not inferior to emerald and high-grade green jade cheap name bracelet. Just because of the scarcity of production and the relatively late discovery (mid-19th century), it became the new favorite of some gem and mineral lovers and collectors, but its price is quite expensive.