Diamondius

Diamondius is an object that appears in the Adventures of Sonic the Hedgehog television series. It is an extremely durable type of mineral.

Description
Diamondius is a type of mineral found underground. It is very valuable and is said to be the strongest substance on Mobius, being so durable that a cage made of it is able to withstand Sonic's Triple Spin.

Trivia

 * Diamondius is a parody of Diamonds, which were believed to be the hardest material in the world up until the early 21st century.