CTF is the abbreviation of Chow Tai Fook's English trademark chow tai fook, and is also its manufacturer code. This is Chow Tai Fook's product AU750, which is made of 18K gold. The S seems to refer to sapphire. These are Chow Tai Fook's 18K gold inlaid sapphire earrings. As for the market price, it is hard to say. It has a lot to do with the size of the gemstone, the amount of precious metal used, and the craftsmanship.

It is recommended that you go to the Chow Tai Fook counter to look at the same product. If the style is the same and the gemstones are similar in size, the price difference will not be much, and Chow Tai Fook will give you a 50% discount at most, so The price is easy to calculate