Most things get their colour due to how they react with light. Without colouring elements (and/or colour centres), all Sapphires would be colourless. In their pure state, 'other coloured' minerals are colourless, for example Sapphire. For example, Peridot will always be shades of green from its high iron content, which comprises 12-15 percent of its total mass.Ģ.Other Coloured (Allochromatic): Colour is caused by small amounts of colouring elements that are not part of the mineral's normal crystal structure and/or crystal imperfections (colour centres). In general, intense colours are more favoured than those that are dark or light, but there are exceptions, for example, that Victorian favourite, Rose de France Amethyst.īut how does colour actually work? Simplistically, gemstone colour occurs in two ways:ġ.Self Coloured (Idiochromatic): A colouring element is incorporated into the mineral's crystal structure, always giving it a characteristic colour. Inversely, if a gem's colour is popular and it's rare, such as Paraíba Tourmaline or Padparadscha Sapphire, then you've got a gemstone superstar. Fashion is easy to understand, it's all about colour popularity if no one finds a gem's colour attractive, then its rarity really doesn't matter. The most valuable colours depend on two factors, fashion and rarity. ![]() It will come as no surprise that the more attractive a gem's colour, the higher the value. ![]() This is not to say that there are no colour paradigms in gemstones, there certainly are, but these should never be at the expense of personal preferences. But like everything to do with beauty, it is highly subjective and at the end of the day, in the eye of the beholder. Yellow Sapphire is an 'other coloured' gemstoneĬolour is the single most important factor when assessing coloured gemstones.
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