Diamond them with diamonds. Much more recently (tens to hundreds of million years ago), they were carried to the surface in volcanic eruptions and deposited in igneous rocks known as kimberlites and lamproites. Synthetic diamonds can be grown from high-purity carbon under high pressures and temperatures or from hydrocarbon gas by chemical vapor deposition (CVD). Imitation diamonds can also be made out of materials such as cubic zirconia and silicon carbide. Natural, synthetic and imitation diamonds are most commonly distinguished using optical techniques or thermal conductivity measurements. Diamond is a solid form of pure carbon with its atoms arranged in a
What Time Is Love? "What Time Is Love?" was given international commercial releases on many occasions and in many forms between 1988 and 1992. The following lists detail most of these, but are not exhaustive. "What Time Is Love? (Pure Trance Original)" (catalogue number KLF 004T) was first released on 17 October 1988, and deleted following initially low UK media interest and sales. The reaction from continental Europe's clubbers and DJs led to further European releases in 1989 and 1990. In late 1989, a US edition of "Pure Trance 1" (sea-green writing on a black sleeve, and slightly different typography) was issued on the