Tiffany Blue is probably the most expensive blue in the world, because it is the blue that exists in the dreams of millions of women around the world, and it is also popular all over the world because of Audrey Hepburn's interpretation. Its origin can be traced back to the French court in19th century.

Turquoise, as one of the four ancient jade in China, began to appear as early as 7000 years ago during Yangshao culture. During the Xia, Shang and Zhou Dynasties, turquoise became a symbol of kingship, frequently appearing on the ceremonial vessels and jewelry of the court, and the identity of the imperial stone began to appear. The swords of Gou Jian, King of Yue, and Fu Cha, King of Wu were all decorated with the best turquoise.

In the Qing Dynasty, turquoise was called "the pearl in the sky" because of the special love of yongzheng emperor and Emperor Qianlong and its aura color, and it was listed as a royal specialty and a national monopoly jewel.

Because gemstones are non-renewable resources, although they are listed as the royal favorite, Yong Zhengdi has always been frugal. He chose porcelain between porcelain and precious stones, and ordered the craftsmen of Jingdezhen Imperial Kiln Factory to successfully fire a kind of glaze with the same color as turquoise, which is called turquoise green glaze, which shows his love for turquoise.

In the Qianlong era, the love for turquoise increased. Emperor Qianlong himself is a big fan of turquoise. Many times, turquoise mines are only owned by the royal family, and illegal mining is prohibited by the people. During the thirty-seven to forty-one years of Qianlong, he gave royal approval to the memorial of mining in Zhushan County, the main producing area of turquoise in China, at least five times.

According to the Records of Emperor Gaozong, in May of the thirty-seventh year of Qianlong, Emperor Qianlong discussed with the Minister of Military Affairs about the exploitation of Zhushan turquoise and wanted to formulate relevant systems. He said: "Today, the turquoise produced in Zhushan, Chu Province. This is a founding thing. Stealing is forbidden in the future. The official is mining. " "I told the governor and commander that they should make rules and compromise with the manager later."

Turquoise, which has been popular all over the world for 7000 years, is not only the exclusive favorite of the royal family, but also accompanied by the top and most luxurious swords, ritual vessels and crowns. It is also called the stone of success and the stone of luck among the people.