Humanity has always treasured gemstones, which we value for their powers and therapeutic qualities as well as for use in jewelry and fashion. Gemstones are gems, and their value should increase with their rarity. We have discussed a few of the world's rarest jewels in this blog post. Most folks aren't even aware of some of these beauties. The world's rarest gemstone is thought to be paunite. This gem has a Mohs hardness of 8 and is available in reddish brown, orange, or pink hues. The Alexandrite diamond, renowned for its extraordinary capacity for color shift. Seldom does one find a stone that changes color in nature, let alone one of such superior quality. The Alexandrite stone may seem red or green depending on the light. This diamond is frequently described as an emerald by night and a ruby by day. However, the light and the gem's optical characteristics are all that are involved in the color shift. Alexandrite, which has a hardness of 8.5, was initially found in the Russian Ural Mountains in the 1830s. The gem may now be found in Brazil, East Africa, and Sri Lanka.