By subjecting graphite to extreme pressure and heat, researchers synthesized a rare hexagonal diamond, also known as lonsdaleite—a crystal structure that has long been theorized to be stronger ...

In testing the diamonds using sound waves, the scientists behind the study found the manmade hexagonal diamonds to be significantly stiffer than natural cubic diamonds. “Diamond is a very unique ...

However, researchers say, the applications of such a hexagonal diamond (HD), known as lonsdaleite, have been “largely unexplored” due to the low purity and minuscule size of most samples obtained.