As to the famous question of why the Diamond normal color scale starts from the letter D instead of starting with the letter A, there is a very interesting reason with a brilliant outcome.
Imagine you have a colorless Diamond, and you call it "A" color, your friend who happens to have a colorless Diamond to, decided to call his "AA", that immediately makes your Diamond a non"AA", the next day when a third friends decided to call his colorless Diamond "AAA" all the other colorless Diamonds become not so colorless because they are no "AAA".
In other words the GIA had to start a new system that had no connection to any existing system, in order to avoid confusion, and this is how the letter D become the first one to start the scale.
Some people say that the reason was to leave an open space in case a new color is discovered, the GIA color grading people realized that if they want to enter history they have to leave open door to possible future discovery of new colors.
So just in case anyone tries to sell you and A B or C color diamonds, tell him you found an "AAA" Diamond for a better price and find your way out as soon as possible.
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