Is anything harder than a diamond?

Diamonds are naturally hard, but is there anything from Earth, space or even a lab that

Is there anything stronger than diamond?

Would it be possible to make a much harder material than diamond by forming an allotrope of a different element, or is Carbon the best option? : r/askscience

Calling Cartier Love Bangle Owners

Materials: Scientists create 'ultrahard' GLASS that's even harder than a diamond

Diamonds: So Much More Than A Birthstone

Have scientists found something harder than diamonds?

Carbon Crystals Harder Than Diamond Found In Finnish Meteorite

Are diamonds the hardest substance in the world? - Quora

How hard is a diamond? - Quora