In the last post we got you all clued up on the meaning of Cut when it comes to diamonds; this week we’re turning to colour, or a lack of colour should we say.

Diamond colour is graded by how colourless (or white) the precious stone is. The colour grades range from D (colourless) right down to Z (yellow tint). The whiter the diamond, the greater its value, making D graded diamonds the most rare and valuable.

The Colour Gradings are as follows:

D-F: Colourless, so naturally the most valuable and desirable because of their rarity
G-I: Virtually no discernable colour is visible to the untrained eye
J-M: Very faint yellow tint, however – top tip alert – this can be minimised by selecting the correct mount
K-Z: Visible colour tint only sells diamonds with a colour grade of J and higher so there’s no need to worry about an unwanted yellow tinge.

Note that the fluorescence of a diamond can affect the colour a diamond appears to be. Simply, if a diamond exhibits fluorescence it means that its colour changes when exposed to ultraviolet radiation. If the diamond has this characteristic, it can appear to change in colour quite often. Diamonds producing a blue reaction usually appear whiter, or more colourless, under UV light whereas stones that produce a yellow reaction will appear even more yellow under some lighting conditions.

So, that’s your science lesson done for today! Feel like a colour expert now?

18k White Gold Engagement ring with 0.3ct Marquise Diamond D/IF