What is the rarest thing in the world?

The rarest thing in the world is subjective and can vary depending on the context. However, one example of something extremely rare is the Pink Star diamond, which is a 59.60-carat pink diamond that was mined in Africa in 1999. It is considered one of the most valuable and rarest diamonds in the world due to its size, color, and purity. Another example of rarity is the Philippine Eagle, which is one of the rarest and most endangered bird species in the world, with only around 400 individuals remaining in the wild. Ultimately, rarity is often determined by a combination of scarcity, uniqueness, and desirability.