rarest substances on earth

https://www.livescience.com/32387-what-is-antimatter.html
https://www.telegraph.co.uk/news/2017/03/16/sierra-leone-pastor-unearths-one-largest-diamonds-ever-found/
https://en.wikipedia.org/wiki/Antimatter
https://en.wikipedia.org/wiki/Rain_of_animals
https://www.earthtouchnews.com/natural-world/natural-world/meet-pearl-one-of-the-worlds-rare-albino-alligators/
http://www.emlii.com/5c268a40/24-Rarest-of-Rare-Awesome-Things-Found-on-Earth-Ever
https://www.sciencealert.com/meet-the-rarest-natural-element-on-earth
https://www.miningglobal.com/top-10/photos-top-10-rarest-gems-found-earth
https://en.wikipedia.org/wiki/Astatine
https://www.livescience.com/39514-facts-about-astatine.html
https://www.chemicool.com/elements/astatine.html
https://www.howmuchisit.org/how-much-does-astatine-cost/
https://financesonline.com/10-really-expensive-gemstones-from-tanzanite-to-pink-star-diamond/