First, what do you think of diamond rings?
If you want to know how to see how many points a diamond ring is, you must first understand what points are. In fact, the weight of diamonds is calculated in carats, 1 carat = 200mg = 0.2g ..
The notch of the diamond ring can be seen from the inner wall of the ring. If there is a main diamond and a small diamond, the inner ring of the diamond ring will be engraved as follows: D0.503ct d0. 100ct. The material and LOGO of the diamond ring will also be engraved on the inner wall of the ring. If the material is 18K, then the gold will be engraved with G 18K, which can be queried according to the certificate.
Second, the criteria for the division of diamond rings
The grading standard of diamond ring can be subdivided into four aspects: weight, clarity, color and cutting, also known as the 4c grade standard of diamond ring. See the figure below for specific classification rules.
1, color
Color Grades of Diamonds GIA classifies the color changes of colorless to light yellow or light brown series diamonds into 23 continuous color grades, with English letters D, E, F, G, H, I, J, K, L, M, N, O, Q, R, S, T, U, V, W, X, Y and Z representing different colors from high to low.
Diamond color classification
Generally buy a diamond ring, the closer it is to colorless, the better. The lower the color scale, the yellower the diamond will be, and the fire color of the yellow diamond will be covered up, so the fire color performance of the diamond will be poor. The color scale of diamonds is more intuitive, and the higher the color scale, the more crystal clear it is.
Step 2 be clear
Diamonds are naturally formed. Even though they generally look smooth, there are actually some natural flaws in them. Just like there are black spots in absorbent cotton or jade, this is normal.
Then the clarity of a diamond is actually an index used to measure the defects of a diamond. It uses a standard magnifying glass of 10 times to observe the degree of defects inside and outside the diamond. The higher the definition, the brighter and the better the quality.
GIA cleanliness grading system has 1 1 cleanliness grades, which are FL, IF, VVS 1, VVS2, VS2, SI 1, SI2, I 1, I2 and I3 in turn.
At the magnification of 10, diamonds have no internal and external characteristics and are subdivided into FL and IF.
Under the magnifying glass of 10 times, diamonds have tiny internal and external characteristics, which are subdivided into VVS 1 and VVS2；;
Under the magnifying glass of 10 times, the internal and external characteristics of diamonds are fine, which are subdivided into VS 1 and VS 2.
Under the magnifying glass of 10 times, diamonds have obvious internal and external characteristics, which are subdivided into SI 1 and SI2；;
Seen from the crown, diamonds have internal and external characteristics, which are subdivided into I 1, I2 and I3.
So according to the naked eye, it is class I that can see the definition defect.
3, cutting work
Round diamond cutting and grinding usually consists of 57 facets, including crown, pavilion and waist; Crown angle, pavilion angle, platform width ratio, pavilion depth ratio, waist thickness ratio, etc.
GIA's cutting level is divided into five grades: EX (excellent), VG (very good), G (good), F (weak) and P (poor).
The cutting level also includes five polishing levels: EX (excellent), VG (excellent), G (good), F (dull) and P (poor).
The cutting grade also includes five symmetrical grades, EX (excellent), VG (excellent), G (good), F (weak) and P (poor).
4. Number of carats
The carat weight of a diamond is the size of a diamond. 1.00ct equals 0.2g, and one carat equals 100 point. Usually, 50 points equals 0.50 carats.