Inside. "CTF" is the English trademark representing Chow Tai Fook. Every Chow Tai Fook product will have "CTF" printed on the inside, which means that the product is manufactured by Chow Tai Fook. It is also an anti-theft product mark. For example, the Chow Tai Fook Heritage Bracelet has a small mark on the inside of the bracelet. This "CTF" logo sign. "Chow Tai Fook" is a well-known Chinese jewelry brand with a history of 17 years and 2,300 chain stores, covering more than 300 large and medium-sized cities in 32 provinces and cities across the country. It is rooted in China and blooms in the spring of China's rejuvenation. Chow Tai Fook has been in the market since the 1990s. China is vigorously developing diamond jewelry and other jewelry retail chain businesses.