How to check the weight of diamonds How to calculate the weight of diamonds

When buying diamonds, in addition to looking at the cutting style of the diamond, the weight of the diamond is also very important. The heavier the diamond, the more expensive it is. The size and weight of the diamond are generally expressed in "carats" and "points".

Diamond weight is measured in carats (CT). 1 carat = 0.2 grams = 100 points. 0.75 carats is also called 75 points. The value of diamonds increases in an irregular geometric progression as the weight of the diamond increases. Consumers can determine it based on their personal preferences and purchasing power. Generally speaking, only diamonds weighing more than 50 points begin to have collection investment value.

When there is no weighing machine, people usually use their naked eyes to judge the weight of a diamond. How do we judge it? In general, the diamonds we come into contact with are mainly inlaid jewelry. If we use our naked eyes to judge, round diamonds are easier and can be estimated within a rough range. In addition to weighing and looking at the weight of a diamond ring with the naked eye, there is another way to roughly determine the weight of a diamond ring, which is the calculation method. The formula can be applied: diameter cubed × 0.00366 (allowing an error of ±0.03ct, unit: mm).

1. EXCELLENT cut: This is a standard that only 3% of top-quality diamonds can achieve. This cut allows the diamond to reflect almost all the light that enters the diamond. It is an elegant and outstanding cut.

2. Very Good Cut: This represents about 15% of diamond cuts. It can make diamonds reflect the same light as standard grade cuts, but the price is slightly lower.

3. Good cut: represents about 25% of diamond cuts. Diamonds reflect most of the light that enters the diamond.

4. General Cut (FAIR): represents about 35% of the diamond cutting, which is still a high-quality diamond, but the light reflected by the diamond processed by general cutting is not as good as that of G-grade cutting.

5. Poor Cut (POOR): This includes all diamonds that do not meet the general cutting standards. The cut of these diamonds is either deep and narrow or shallow and wide, which makes it easy for light to escape from the sides or bottom, thus making the diamond lose its brilliance.

According to the customary classification in the diamond industry, diamonds below 0.05ct are broken diamonds, 0.05ct-0.22ct are small diamonds, 0.23ct-1ct are medium diamonds, 1ct and above are large diamonds, 10.8ct-50ct are extra large diamonds, and 50ct and above are named diamonds. Generally speaking, unless the color is rare or there are other special features, only giant diamonds weighing more than 100ct are qualified to be recorded in the history of world famous diamonds. The "carat premium" phenomenon, the higher the grade of the diamond, the greater the impact of weight on the price. This is especially obvious for diamonds of critical weight. When the color, clarity, and cut are similar, as the weight of the diamond increases, its value increases in geometric progression, that is, the price is in a step-like shape. The price of a diamond = carat squared × carat base price. For integer fractions, there is a "carat premium" phenomenon between the prices of diamonds. Even if there is only a difference of 1 point, the price of a 99-point diamond is far from that of a 1ct diamond.