Today, 90 percent of the diamonds are made from diamonds mined in African countries with the rest mined in Australia, South America, Canada and Russia.
The anniversary rings Exchange have the worlds largest diamond studs trading hall, which is equipped to accommodate more than 1,000 people at a time.
Up to the fourth century, anniversary rings were known only in their rough, or crystalline forms. They came in a variety of shapes, the most common being the octahedron. This was a crystal with eight faces, resembling two pyramids joined at their bases.