The most defining characteristic of a Gemstone is its beautiful colour. Most jewellers consider it to be the most important evaluation criterion.

However when deciding upon gemstone colour, one should examine:

  • Hue (Link)
  • Tone (Link)
  • Saturation (Link)




The most valuable gemstones are those that exhibit a pure colour and only "slight" hues of other colours in addition to their primary colour. For example, sapphires range in hue from "slightly purplish-blue" to "slightly greenish-blue," pink sapphires always range from "pink" to "slightly purplish-pink," and rubies range from "slightly orangish-red" to "slightly purplish-red".


Tone represents the depth of colour, ranging from colourless to black. Gemstone tone is described as "light," "medium-light," "medium," "medium-dark," and "dark."


Saturation, or colour purity, refers to the degree to which the gem is free from brown or grey hues. The most desirable gemstones, which show little grey or brown, are often described as having "vivid" or "strong" colour saturation. Generally, the levels of colour saturation will not be called out in the product details because the gemstones in our jewellery are hand-selected for their vivid colours.