Coloured gemstones offer something diamond cannot, which is colour that carries meaning. This collection holds pieces where a coloured stone leads the design, including the Nefertiti 5.04ct Burma sapphire cluster, the Cleopatra 3.99ct diamond ring, the Artemis old cut platinum ring and the Sheba round brilliant platinum ring.Three stones account for most serious coloured gem jewellery. Sapphire is the hardest and the most practical for daily wear, available in every colour except red. Ruby is the same mineral coloured by chromium, rarer than comparable diamond at the top of the market. Emerald is the softest of the three and the most demanding to set, but nothing else produces that green.Buying coloured stones is a different discipline from buying diamonds. There is no universal grading system, origin affects value enormously, and treatments are routine and legitimate but must be disclosed. Two sapphires with identical descriptions can differ in price by a factor of ten, and the difference is visible only to someone who handles stones regularly. That is the argument for buying from a jeweller who will explain what you are looking at.Our gemstone guides cover origin, treatment and value across the coloured stones. For a specific stone we do not hold, our bespoke service can source it and build around it.