The four ways of judging gemstones are known as the 4C's. They are Cut , Color , Clarity , and Carat-Weight .
Diamonds come in every color of the rainbow, plus clear, grey, brown, and black.
Subtle color differences can make major price differences in the cost of a gemstone. There are the perfect colors accepted for some gemstones. Although the majority of gem quality diamonds appear to be colorless, others can contain increasing tinges of yellow or brown or grey, some of which are referred to as champagne gold-red diamonds. It is a totally colorless diamond that allows white light to pass effortlessly and be dispersed as rainbows of color. Above is a color grading scale from totally colorless to light yellow.