These are some great color descriptions. I can see these being of use in a lot of rp.
One caveat I must mention is the use of stones to reference color. I only see Emerald and Jade being used so far, and while emeralds are a form of beryl with specific impurities which make them green (the word originates from a Hebrew word meaning "green"), jade can come in a great variety of colors (historically, white jade has been particularly prized in China). This is true for many stones which are categorized by properties other than color, such as diamond, garnet, topaz, and all the stunning varieties of quartz (flint, agate, onyx, citrine, amethyst, carnelian, and jasper are all forms of quartz).
Even emerald, green by definition, has had some misuse due to other colors of beryl being marketed to raise the perceived value. (Google "pink emerald")
My point: Very few stones are actually named for their color, and the nature of mineral composition means that a crystal of any sort could form with impurities that alter the color dramatically.