Diamonds are graded by colour, starting at D and continuing
through the alphabet. Truly colourless stones, graded D, treasured
for their rarity and value, are of the highest quality .
While many diamonds appear colourless, they may actually have
subtle yellow or brown tones and these colour grades include P
and Q. Although still beautiful, they will be less rare and therefore
less valuable. To appreciate the simple beauty of each individual
stone, you should compare diamonds side by side with a jeweller.
"Fancy" diamonds -- in well defined colours that include red,
pink, blue, green and canary yellow -- are highly prized and particularly
rare.