Emerald, known as the king of emeralds, is one of the four precious gems recognized by the international jewelry industry, and it is also a very old gem variety. The green color of emerald comes from chromium ions, and a small amount of chromium oxide makes it appear crystal clear and beautiful green.
Jasper is a kind of Hetian jade with more minerals, which contains more than 20% iron oxide and clay minerals. Jasper is mostly dark red, green or variegated, which can be called ruby and green jasper according to color.
Turquoise is a phosphate minerals aggregate of copper and aluminum. Its appearance color is generally blue-green, green, light green, yellow-green, gray-green and so on. Its texture is delicate and soft, and its hardness is moderate. Usually divided into four varieties, namely porcelain pine, pine, bubble pine and iron pine.