Colorless: D-E color...the whitest you can get.
Royal white: replaced "RG White" which was approximately an F/G color. It is heat enhanced.
Imperial White: replaced "Chinese" or "CW" white, approximately an H color. It is also heat enhanced.
RLY: Russian Lightest Yellow. Also no longer available except for the precious few we have left in inventory. This color was approximately a J-K color on the scale. Was also referred to by some as lightest yellow.
Light Yellow: This is approximately a N-O-P color. The brilliant cuts such as the round and princess show the color differently than an emerald, Angel, or Cartier cut. The more facets, the lighter it looks.
There is a picture guide on our site which shows which color is which.
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