- 中文
- English
- Español
Diamond Color and Grade (2)
2023-04-13 16:22:33
Click：
“
The color of a diamond, on the one hand, can affect the appearance of the diamond; on the other hand, it can also reflect the rarity of the diamond. The more colorless a diamond is, the rarer it is. Although the hue difference between diamonds that are close to colorless has no real effect on the appearance of the diamond.
”
According to my country's national diamond grading standard (GB/T16554-2010), the color of unmounted diamonds is divided into 12 grades, and diamond color grades are described in two ways: letter terms and number terms
diamond color grade(GB/T16554-2010) | Reference characteristics of the corresponding master stone | |
D | 100 | Grade D: Extremely white to slightly watery blue |
E | 99 | E grade: pure white |
F | 98 | Class F: white |
G | 97 | Grade G: almost no yellow tinge on the pavilion and girdle sides |
H | 96 | Grade H: The pavilion and the sides of the girdle appear to have a yellowish tint |
I | 95 | Grade I: Very slight yellowish white on the side of the pavilion and girdle |
J | 94 | Grade J: slightly yellowish-white on the side of the pavilion and girdle, very slightly yellowish-white on the crown |
K | 93 | Grade K: very light yellow-white on the side of the pavilion and girdle, slightly yellow-white on the crown |
L | 92 | L grade: light yellowish white on the side of the pavilion and girdle, slightly yellowish white on the crown |
M | 91 | Grade M: Pale yellowish-white on the side of the pavilion and girdle, and light yellowish-white on the crown |
N | 90 | Grade N: The diamond has an obvious light yellow color when viewed from any angle |
<90 | ||
The world's major diamond grading agencies have no essential difference in diamond color grading standards. European color grades use A descriptive term whose meaning is close to that of a color phenomenon, and which is easy for people without professional knowledge to understand.
The color of a diamond, on the one hand, can affect the appearance of the diamond; on the other hand, it can also reflect the rarity of the diamond. The more colorless a diamond is, the rarer it is. Although the difference in hue between diamonds that are close to colorless has no real effect on the appearance of the diamond, they are still classified into different grades and differ in price more than diamonds with darker hues. big. The color of a diamond is closely related to its price. Under the same conditions as the other three "Cs", the higher the color grade, the higher the price. The price difference between each color grade is between 10% and 45%. The price difference of high-color diamonds is greater than that of low-color diamonds. It is precisely because of the huge difference in the value of diamonds of different color grades that it is necessary to accurately grade the color of diamonds.
-
Why Are Large-Size Single-Crystal Diamond Heat Sinks Manufactured Using a Mosaic Assembly Process?
In the packaging design of 5G RF power amplifiers, automotive VCSEL radars, high-performance AI chips, and high-power industrial lasers, large-area single-crystal diamond heat sinks measuring 35 mm or larger are an essential requirement. Most procurement and thermal design engineers ask the same question: Why do 25×25 mm single-crystal heat sinks on the market tend to use a mosaic assembly structure? This is not due to a simplification of manufacturing processes, but rather because of unavoidabl
-
CVD Diamond: Growing Diamonds for the Future
When people talk about diamonds, the first thing that comes to mind is usually luxury jewelry. But today, diamond is becoming much more than a gemstone. With the rapid development of AI, semiconductors, 5G, and high-power electronics, diamond is attracting attention as an advanced material because of its exceptional thermal properties.
-
What Are Treated Diamonds? From Technology, Differences to Identification
In the diamond consumer market, one question is being asked by more and more buyers: "Is the colour of this diamond natural, or has it been treated?" So what exactly is a treated diamond? How is it "treated"? And how can consumers identify and judge it?
-
The Metamorphosis of Diamond: From Jewelry to a Cornerstone of Technology—Three Key High-Tech Applications of CVD Single-Crystal Diamond Wafers
When you hear the word "diamond," what comes to mind first? Is it dazzling diamond jewelry, or the romantic vow that "a diamond is forever"? In reality, diamond is making a major breakthrough in the realms of industry and technology—demonstrating its value in a truly "hardcore" way. Thanks to its status as the hardest material in nature, its exceptional thermal conductivity, and its broad optical transparency (spanning from ultraviolet to infrared), CVD (Chemical Vapor Deposition) single-crystal
