Synthetic diamond "nanocrystalline" and "microcrystalline" diamond, respectively. Synthetic diamond is the hardest known material, where hardness is defined as resistance to indentation. The hardness of synthetic diamond depends on its purity, crystalline perfection and orientation: hardness is higher for flawless, pure crystals oriented to the <nowiki>[</nowiki>111<nowiki>]</nowiki> direction (along the longest diagonal of the cubic diamond lattice). Nanocrystalline diamond produced through CVD diamond growth can have a hardness ranging from 30% to 75% of that of single crystal diamond, and the hardness can be controlled for specific applications. Some synthetic single-crystal diamonds and HPHT nanocrystalline diamonds (see hyperdiamond) are harder than any known
Coca Crystal Coca Crystal Coca Crystal (December 21, 1947 – March 1, 2016) was an American television personality and political activist. She was best known for her weekly cable-access variety show "The Coca Crystal Show: If I Can't Dance, You Can Keep Your Revolution", which ran from 1977 to 1995. Born as Jacqueline Diamond on December 21, 1947, to Jack Diamond, owner of J. Diamond Furs and Rita Dunn, a former fur model. She was born in Manhattan and raised in Mamaroneck. Starting in 1969, she was a contributor to the East Village Other (EVO) and the name Coca Crystal was created