Semi-precious purple opal have been valued for many years and have been used as decoration for that long. Gemstone or as we will refer to them as semi-precious stones is a natural mineral and when these beautiful stones are cut and polished they are used to create amazing handmade jewelry. Not all semi-precious blue fire opal are outright gems, and not all sparkle and glitter, natural minerals like opals and pearls, but even fewer still fall into the semi-precious category. After being cut and polished, these natural stones are used set in precious metals to make earrings, blue fire opal, pendants, necklaces and jewelry sets.