The chemical composition of 42 various colour spinel minerals from the Vietnam Luc Yan locality and the Sri Lanka Ratnapura locality were investigated and according to the results of the research the chromophore influence on colour was interpreted. It was established that the colour of spinel mineral is determined not only by chromium, iron, cobalt but also by vanadium. We assume that V³⁺ determines the brown or yellow spinel colour, since a relatively high content of V₂O₃ (0.44–0.88%), which may determine the orangey hue of mineral, was found in the investigated orangey pink samples from the Ratnapura locality. Other chromophores found in these samples, such as chrome oxide (0.05–0.36%), iron oxide (0.08–0.28%) and cobalt oxide (0.05–0.20%), show low or medium contents, which determined the pink hue of spinel. After carrying out the research on the samples of dark red spinel, it was established that the red colour is determined by a high content of Cr³⁺. The purple/violet colour of samples is determined by Fe²⁺ and a low content of Co²⁺, whereas the pink hue of samples is determined by Cr³⁺ and a high content of Fe²⁺, which saturation depends on the quantitative ratio of Fe²⁺ and Cr³⁺. Relatively low contents of chromophores V³⁺, Cr³⁺, Fe²⁺ and Co²⁺ were found in the pinkish grey spinel, thus their hue is grey.

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