The gold quality of Chong Hing Jewelry is said to be slightly lacking in purity compared with other jewelry companies. Regarding diamonds, the value of diamonds is mainly investigated from four aspects: carat number, color, clarity and cut, which is often referred to as 4C standard. The price difference of diamonds with the same quality, the same color, the same clarity and the same cut is within 3%; Diamonds with the same quality and different color grades have a price difference of 20% to 30%; The price difference of different diamonds is 30% to 40%; The difference of different clarity can reach 40% to 50%. 1 carat size, color, clarity and cut diamonds are the best. Compared with a 1 carat diamond with color, clarity and cut, the price difference can reach 70% to 80%. The clarity of diamonds is generally divided into six grades: FL, IF, VVS, VS, SI, I, and diamonds of VVS grade are generally beautiful.