From Rock to Ring

1. FORMATION
Millions of years ago intense heat and pressure caused loose particles of carbon hundreds of miles below sea level to crystallize into diamonds. Volcanic eruptions then pushed the diamond-bearing ore close to the earth's surface

2. MINING
The ore, known as kimberlite, is dug or blasted from mines; the deposits are then crushed and boiled in grease and water to separate the diamonds. About 80% of the world's rough stones come from Angola, Australia, Botswana, Namibia, Russia, South Africa and Zaire

3. SORTING
The rough diamonds are sorted and...

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