Color.  Simple colors of diamonds grading.

Color is the first subject, we are going to talk about. Diamond scale is not difficult at all. First of all, it’s easy to understand because the scale goes in the alphabetical order, we just begin our scale from letter “D” as the highest color. Why do we start with “D”-? Because A, B, and C were already used for other definitions in diamond industry. Now, we can divide the whole scale into 3 groups:

D,E,F - Colorless

G,H,I,J - Near Colorless

K,L,M,...Z - Light Yellow

It is not difficult, is it right? Most of the diamonds have yellow tints of color, which are caused by the trace of nitrogen inside the crystal lattice of diamond. The more nitrogen is in the diamond – the yellower it is and the price is lower. The less color is in the diamond – the rarer it is and the price is higher. According to it, we grade diamonds from D to Z colors scale. From absolutely colorless D color to the strongest tint of Z color grade.

Your next question is: how to understand a simple way, what all those grades from D to Z mean? First of all, let me tell you a small, but very important secret. The gemologist and the customer see the same stone in absolutely different ways, in the literal sense of the word. They see the diamond from different directions or positions. The gemologist inspects the color of the loose diamond, looking from the side position when the stone is turned upside down. Instead of it, the customer sees the diamond already set in a ring or other jewelry, from the face-up position.
The first group is the rarest and high priced one – Colorless - D, E, F color. From D – absolutely colorless to F, that have almost unnoticeable, very, very slight tint of yellow. Is it possible to see the difference between D, E or F colors from the face-up, out of the laboratory and not under the proper lighting? No, it is almost impossible, only skilled - gemologist might see the difference between the diamonds, but still, he will not be able to grade the color exactly out of the lab. If you don’t find any reason to pay more for D color, you do not have to, only when your social status makes it possible for you or your fiancé insists. Buy F color, you will not see any difference. The slight difference might be seen only if you place two diamonds of F and D colors aside, but it’s still not easy to detect. In the case, that you want only the best, prepare your bank account, it may cost you additional 10% (for the low clarity) up to 40% (for the high clarity diamond) comparing to the same clarity F color diamond.
From face-up the tints are undetectable.
The second group is Near-colorless – G, H, I and J. It will be easier for you to divide next category into two parts. Will a regular person see a slight yellow tint from the  face-up position? I don’t think so because it will remain almost white. The difference from face-up position can be seen only if you place the stone next to the colorless (D, E, F) one, otherwise, it is almost undetectable. G, H and I are still expensive but they are not as expensive as colorless stones. The second part of this Near Colorless category is represented by J color. From upside down position loose diamond will demonstrate easy noticeable light yellow tint. From face-up position, it will demonstrate not easy, but detectable light tint. Set in the jewelry, J color looks almost white.
G, H tints are almost undetectable. J color is recommended to use with yellow, red or pink gold to make it look "whiter".
K, L, M... up to Z
Next, third category is represented by K, L, M..up to Z colors. From K color, you start to notice light yellow tint from not only from the side but also from the face-up position when the stone is set in the ring. Does it mean, that you shouldn’t choose K or L color diamonds? No, it doesn’t. If you set low color diamond in yellow, pink or red gold by open prongs setting, you will get fabulous, surprisingly white looking stone, due to the colored background of the engagement ring. If instead of it, you will set the K, L or M color diamond into white metal, you will easily see non-attractive strong yellow tint of the stone. This knowledge may help you save good amount of money, you may spend on another matters, and still to get fabulous ring.
I2 and I3.. don't even think to approach such a clarity if you don't want to get devorse even before you get married.
In Conclusion

D, E, F and G colors are perfect for the white metal ring.

H and I can be used with both metals white and yellow. H color, set in yellow metal with open prongs will look almost like E color, due to the contrast of yellow metal ring.

J, K, L, and M are better to be used with yellow, pink or red gold with open prongs setting. The contrast of colors make them look much whiter up to 3 grades up.

So, I hope these small secrets will help you make the right choice.
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