Introduction of Diamond Color Grades
The colors of diamonds are divided into two series-colorless series and colored series. The color of colorless diamonds is usually classified according to the color established by GIA, American Gemological Institute. From D to Z, colored diamonds are rare diamonds with strong colors, such as pink, blue, green, yellow and very rare red. The color grading system is not suitable for colored diamonds.
Grade d: completely colorless. The highest color level is extremely rare.
Class e: colorless. Only gem experts can detect trace colors. This is a very rare diamond.
Class f: colorless. A small amount of color can only be detected by jewelry experts, but it is still considered colorless. It belongs to high quality diamonds.
G-H grade: almost colorless. Compared with higher grade diamonds, it has a slight color. But diamonds of this color still have high value.
I-J grade: almost colorless. A slight color can be detected. The value is higher.
K-M grade: dark color, poor fire color, Zakaly jewelry net is not provided, and customers are advised not to use it.
N-Z grade: dark color, poor fire color, Zakaly jewelry net is not provided, and customers are advised not to use it.
Introduction of diamond clarity grade
Every diamond contains natural inclusions, just like natural birthmarks. The quantity, size, shape and color of these inclusions determine the purity and uniqueness of diamonds. Inclusions are hidden in diamonds and can be different colors: white, black, colorless, even green or red. Most of the contents can't be recognized by the naked eye, and they can only be seen clearly under the magnifying glass of 10 times.
FL means that the diamond is clean under the magnifying glass which is 0/0 times of the gem/kloc, that is to say, there are no inclusions inside and outside the gem.
IF means that the diamond has no flaws under the 10 times gem magnifying glass, but there may be some flaws on the surface, which can be removed by grinding again.
VVS means that there are tiny flaws in the pavilion or surface of a diamond when it is observed under a gem magnifying glass which is 10 times. The difference between VVS 1 and VVS2 is that the latter has small cotton spots and stubble.
VS refers to the tiny flaw that a diamond can see under the magnifying glass of 10 times. The difference between VS 1 and VS2 is that the latter may have tiny cotton spots or stubbles.
SI means that it is easy to see defects when observing diamonds under a 10 times gem magnifying glass, but it is invisible to the naked eye.
I 1, I2, I3 refer to the small flaws that are easy to see when a diamond is observed under a gem magnifying glass with a magnification of 10, which are just visible to the naked eye, and some have obvious cleavage and cracks.
All diamonds are observed with a magnifying glass of 10 times, and only the I3 grade can easily see the defects with the naked eye.
Introduction of diamond weight (carat) grade
The weight of diamonds is calculated in carat (CT). 1 carat = 0.2g = 100 min. 0.5 carat is also called 50 cents. Under other similar conditions, with the increase of diamond weight, its value increases geometrically; Diamonds with the same weight will have different values due to different colors, cleanliness and cutting. Diamonds weighing more than 50 carats have the function of preserving and increasing value, and the bigger they are, the more attractive they are.
From the comparison table and schematic diagram of diamond diameter and weight, it can be seen that the larger the carat weight, the more precious the diamond with the same quality.
Introduction of diamond cutting grade
Cutting refers to the angle at which the technician cuts the petal surface of the diamond and the proportion of each part of the diamond after cutting. According to the scientific equation, the perfect cut diamond should reflect the light entering the diamond through different petal surfaces, and finally condense on the top of the diamond to shine. If the diamond is cut too deep or too shallow, the light will flow away from the bottom or side and lose its luster. Therefore, the value of diamonds with appropriate cutting ratio is naturally higher.
Excellent: It represents the standard that only 3% of first-class quality diamonds can reach. This cutting makes the diamond reflect almost all the light that enters the diamond. This is an elegant and outstanding cutting work.
Very good: it represents about 15% of diamond cutting. It can make diamonds reflect the light of standard grade cutting, but the price is slightly lower.
Good cutting: about 25% of diamond cutting. Diamonds reflect most of the light that enters them. Much cheaper than VG.
General: The diamond cutter with a roughness of 35% is still a high-quality diamond, but the light reflected by the general diamond cutter is not as good as that of the G cutter.
Poor: This includes all diamonds that do not meet the general cutting standards. The cutting of these diamonds is deep and narrow or shallow and wide, which makes the light escape from the edge or bottom, thus making the diamonds lose their luster.
Through the above diamond grade table and detailed explanation, I believe you have learned the most basic 4C knowledge of diamonds. I hope that when you buy diamonds, you can shop around and spend the same money to buy bigger diamonds.