Precious stones are the minerals which are used for the purpose of jewely making and ornamental purposes. There are categories in which precious stones are divided some of them are very precious while others are semi precious.
All precious stones possess some kind of unique beauty and such attributes can be identified by considering the hardness, rarity, colour or colourlessness of the stones. It is a fact that some stone are more precious than the others. For instance, diamond is considered to be a very precious stone but still there are many different types of diamonds and every one type of diamond is different from the other in terms of preciousness.
The most precious stones which are commonly used for the purpose of jewellery making or just as accessory consist of; topaz, amethyst, emerald, opal, pearls, diamond, ruby, zicron and many others. The value of each type of stone differs on the basis of their colour or colourlessness, availability, quality, cut, hardness, uniqueness etc.
The more rarely available the stone is the more precious it is considered. Like; the black diamond is a very rare type of diamond which makes it quite precious from other types of diamonds. But at the same time, the preciousness of diamonds also depends upon the type of cut they possess. If a very rare type of diamond is not treated with great craftsmanship it can ruin the whole preciousness of the diamond.
Similarly, some pearls are more precious than others it depends on how they are grown and in which region of the world they come from. It can be the case where stones are not much precious but they are attached to gold or platinum ring, therefore their value increases to an extent. Considering different stones, it is said that diamond is one of the most precious and valuable one as compared to opal or amethyst.
Lastly, it is a very wrong practice to judge the preciousness of a particular stone solely on its price. Because what happens is that when a certain precious stone is in fashion, its price goes up automatically as compared to other stones.