A gemstone is a piece of mineral crystal which, in cut and polished form, is used to make jewelry. Most gemstones are hard, but some soft minerals are used in jewelry because of their luster or other physical properties that have aesthetic value. Rarity is another characteristic that lends value to a gemstone. Many types of gemstones available you can choose according to your birth year. A birthstone is a gemstone that represents a person's birth month. Every month has a unique birthstone. These are often worn as jewelry and as pendants. Go through this https://en.tatias.com/SG/pages/company/birthstone.html to get more idea.