Stones have been valuable for humans since time immemorial. They were one of the first tools for defence when we were evolving and surviving the wild. Some of our oldest monuments are built by stones, no wonder, because they may have seemed formidable as well as eternal to our ancestors. And some of them stood out in this function. The pretty gemstones with their tenacious strength as well as the quality to attract light may have seemed like something divine.
And they continue to fascinate us. Even to this day we assign them names, and have seemed to have developed a science describing how they affect us. Whether they really do so or not may be a matter of debate. But here is an entire website describing qualities of gemstones and their healing qualities as described in a branch of Ayurveda.