Used on a diamond and left on a board. It's great for a gymnast his grip to restore. What is it?

Answer: chalk

More Difficult Riddles with answers

More Difficult Riddles

Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
Using only brackets, parentheses, and these signs +,-, X, /. How can you express 100 with 5 1's and express 100 three ways with five 5's?
Vikings use this for warmth.
Voiceless it cries, wingless flutters, toothless bites, mouthless mutters.
Voiceless it cries, Wingless flutters, Toothless bites, Mouthless mutters. What is it?
Walk on the living, they don’t even mumble, Walk on the dead, they mutter and grumble. What are they?
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.
Walking home one day, you take a short cut along the train tracks. The tracks cross a narrow bridge over a deep gorge. At the point you are 3/8 of the way across the bridge, you hear the train whistle somewhere behind you. You charge across the bridge, and jump off the track as the train is about to run you down. As it happens, if you had gone the other way, you would have reached safety just before being run over as well. If you can run ten miles per hour, how fast is the train moving?
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find
We are few to the wise; We are abundant to the drunken; We can calm the beast and are precious to the child; We can devour the heart, without piercing the skin
We are five little objects of an everyday sort, You will find us all in a tennis court.
We hurt without moving. We poison without touching. We bear the truth and the lies. We are not to be judged by our size.What are we?