![]() ![]() The absence of chromium (at least with the absence of other minerals) gives rise to the rubies distinct red colour. However, at their core, rubies are essentially the same as sapphires, from the standpoint of their mineral character. Rubies are often compared to sapphires, the top blue coloured gemstone in the market. And its colour is a reflection of the changes effected by the presence of chromium atoms in its atomic structure. The defining characteristic of a ruby stone is its colour. Ruby Stone: Gemstone Education Ruby Stone Characteristics
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