Diamonds appear gray under light and may emit blue fluorescence, which is not very strong. High purity diamonds have a transparent and colorless appearance, but when they contain other chemical impurities, diamonds will slightly show different colors. Although diamonds themselves are not brightly colored, they have a high refractive index, allowing them to shine brightly under light.
Diamond color grading
GIA has classified diamond colors based on the amount of yellow elements contained in diamonds, from high to low as D E、F、G、H、I、J、K、M、N。
D-level: The color of D-level diamonds is completely colorless, which is the highest level among diamond grades. However, diamonds of this grade are very rare, so the price is also very high.
E-grade: Colorless grade, consumers cannot see any difference with the naked eye. Only professional gemstone appraisers can distinguish the slightly cool elements contained inside diamonds with the help of special machines, so they are also very rare.
F-grade: Both belong to the colorless grade, and jewelry appraisers can see almost no yellow elements, so it is also a high-quality diamond.
G-H grade: close to colorless grade, only by comparing with high-quality diamonds can the difference be seen, so the quality of diamonds is still very high.
I-J level: A small amount of yellow elements can be seen with the naked eye.
K-N level: The yellow element of diamonds can be observed with the naked eye and has no investment value. It is not recommended to purchase.
