Blue - Fine Color Blue: B 5/5
Red - Fine Color Red: R, slpR 5/5
Purple - Fine Color Purple: P 5/5: P, rP, bP, V 5/4
Other Colors - Fine Color Orange: O, rO 5/5
The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.
Highest values go to pure blue, size and clarity.