Gemstones, precious stones, jewels and gems, are all popular names used to describe mineral pieces which are cut and polished in order to be used in various jewelry pieces. Although most such stones have a mineral origin, there are certain rocks that are not made from minerals and yet are still considered to be gems. Jewels are valued according to their weight (measured in carats), rarity and purity. Lets take a look at some of the main types of jewels. The main jewels and gems classification is diamonds and colored stones; in other words, diamonds and the rest of the pretty stones.
These gems are made from carbon atoms which are compressed at very high temperatures within the Earth’s mantle. They are often brought to the Earth’s surface through volcanic eruptions. Diamonds are the hardest and most thermally conductive of all known natural materials. In the world of jewelries, the value of a diamond is given by the four Cs: carat, cut, clarity and color.
The difference between precious and semi precious stones was emphasized at the beginning of the 19th century. Although this difference exists, it doesn’t always mean that precious stones are more valuable than the semi precious ones. There are many semi precious jewels like opal or jade which are more expensive than certain precious jewels. The prices are usually set according to the rarity of the stone.