Diamond - wikipedia, the free encyclopedia, The conditions for diamond formation to happen in the lithospheric mantle occur at considerable depth corresponding to the requirements of temperature and pressure.. Hope diamond - wikipedia, the free encyclopedia, Hardness. diamonds in general, including the hope diamond, are considered to be the hardest natural mineral on the earth, but because of diamond's crystalline. Blood diamond - wikipedia, the free encyclopedia, Blood diamonds (also called conflict diamonds, converted diamonds, hot diamonds, or war diamonds) is a term used for a diamond mined in a war zone and sold to finance.
Gemstone - wikipedia, the free encyclopedia, There is no universally accepted grading system for gemstones. diamonds are graded using a system developed by the gemological institute of america (gia) in the early. Wedding anniversary - wikipedia, the free encyclopedia, A wedding anniversary is the anniversary of the date a wedding took place. traditional names exist for some of them: for instance, 50 years of marriage is called a.