Gemstones

All the natural gemstones which are not included in the group of the four precious stones, are considered semi-precious stones. They are classified into different groups, species, and varieties. Some popular gems comes from different mineral family, like: quartz, tourmaline, garnet, topaz. Some of the most popular semi-precious stones are: amethyst, aquamarine, tanzanite. Natural colored gemstones can have all the colors of the rainbow, like tourmaline or garnet. Their crystals can presents transparent or translucent clarity and in some case they can be opaque. Some rare material as precious stones, can display optical effect like: chatoyancy, asterism, color change or unique characteristics like: play of colors or labradorescence. Their value can vary a lot, depending of some characteristics like: color, weight, clarity, mineral family, some natural colored gemstones for sale can raise the price of the most expensive precious stones.