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While you may think diamonds are clear, they are all graded on the basis
of their colour. The colour scale starts with D, which is colourless
and continues through to Z which has a light yellow hue. If a diamond
is a saturated pink, blue, green or yellow, however, they are considered
very valuable due to their rarity. Diamonds are graded for colour face
down, through the pavilion.
Colour should be assessed under daylight or fluorescent light. Another
factor that can affect colour is the diamond's proportions. A shallow
diamond can look lighter than a well-proportioned diamond. Size also
plays a part in the visibility of colour. The larger the diamond, the
easier it is to see colour variations.
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