The higher the 4C parameter of diamond, the higher the rarity, the more expensive the price and the lower the cost performance ratio. Diamonds with 30 cents, H color, SI 1 and 3EX are the most affordable choices under certain viewing conditions, and the price of loose diamonds is about 3,000 yuan to 4,000 yuan.
30 points is the mainstream choice of diamond carats, and you can reach the standard with GIA certificate; The parameters of H color, SI 1 and 3EX can meet the requirements of diamond color, clarity and fire color.
Extended data:
4C diamonds:
4C is a measure to judge the value and quality of a diamond. The so-called "4C" is the abbreviation of four English words beginning with C, which refers to the carat weight, clarity, color and cut of diamonds. As long as you synthesize the four points of "4C", it is easy to understand the value and quality of a diamond. Diamond price = weight+color+clarity+cut.
Baidu Encyclopedia -4C