To determine the color quality of a diamond, the appraiser needs to look at it before it goes into a piece of jewelry though. When it is in a setting, the metal can actually make a clear diamond look as though it has a slightly different color. When they are in yellow gold, they might appear as though they have a yellow tint although it is just a trick of the light. Many times it’s not possible for the appraiser to look at the diamond before it is set. An experiences appraiser can make a close judgment in color, but it’s very helpful for you to bring in your documentation or diamond certificate to the appointment.
Experts will judge the color of the diamond based on a system set up by the Gemological Institute of America. They have a grading system for diamonds that goes from D to Z. Those diamonds that have a score of D are extremely rare. It means that they are entirely colorless, and these are the most sought after of diamonds. The diamonds that have a Z grade would have a lot of unwanted color in them. Naturally, where the diamond falls in this grade will greatly determine the value of the diamond.
The diamonds rated D, E, and F are colorless. Those rated G, H, I, and J are nearly colorless, and K, L, and M have some color to them. It is usually slight but yellow. Most of the time, people can’t see the color with the naked eye. Diamonds graded N, O, P, Q, and R have a visible yellow tint to them. S through Z graded diamonds are visible as well, and they are noticeably worse. The diamonds that fall into that category may even take on a brown appearance. You may even be able to see the color difference when the diamond is mounted.
*Courtsey AGI New York