You could be considered natural stones, frequently used in high quality jewelry, deserve to be called something more than “semi-precious”.
Among the many varieties which are on the market some of the most interesting are those which are not transparent and are usually cut faceted that as cabochons. These natural stones are not only appreciated for their color but by the natural details that make each stone a unique cut and despite being considered commercially as “semi-precious stones” does not underestimate its high value.
Among the highlights include quartz, tiger eye, malachite, etc. and a huge variety that deserve a privileged place within the modern jewelry design.
Fortunately, its value is much more accessible than the gemstones and their huge variety of cuts is that you can use them as found in nature by applying its form to the most original jewelry designs.