A UK-based jeweller has released what is claimed to be the world's most expensive phone. The gold and diamond encrusted iPhone 3GS Supreme costs $A3.5 million.

According to research by U.S. and Chinese researchers, the world’s hardest material is no longer diamond or nanomaterials. Lonsdaleite has taken over the top hardness spot here on Earth, and wertzite boron nitride is the second hardest material known on Earth. Even though both are very hard, they are also very hard to find in nature.