The Oppenheimer Diamond, a nearly perfectly-formed 253.7 carat (50.74 g) yellow diamond crystal, is one of the largest uncut diamonds in the world. It measures approximately 20 × 20 millimeters. It was discovered in the Dutoitspan Mine, Kimberly, South Africa in 1964. Harry Winston acquired the stone and presented it to the Smithsonian Institution in memory of the late Sir Ernest Oppenheimer.

References

• CNN.com - Discover the science of diamonds - November 20, 2001 Overview: Why are diamonds so valuable? Have students use the article to learn about the formation and mining of diamonds. Diamonds, one of four types of
• Diamond Jewelry - Diamond Engagement Rings - Learn About Diamonds Explore diamond jewelry and diamond engagement rings. Start with the Four C's: color, clarity, cut and carat weight then branch out to other diamond topics.
• Diamonds: Diamond Source of Virginia Safe and easy way to purchase loose diamonds, diamond rings and diamond jewelry. Diamond Source of Virginia is the premier source of loose diamonds and
• Engagement Rings, Wedding Rings, Diamond Rings and Diamond Jewelry Diamond engagement rings and wedding bands in your choice of platinum, white gold and yellow gold settings plus diamond pendants, earrings and bracelets.
• Everything You Always Wanted to Know About Diamond A tutorial about the history and characteristics of diamond. Includes facts about diamond mining.
• Diamonds! Antwerp has been very prominent in diamond cutting for five hundred years—the first written mention of diamond cutting is in Antwerp in 1550.
• Diamonds - Crystalinks Diamonds are minerals. They are one of two crystalline forms of the element carbon the hardest natural substance known, used as a gem and in industry.
• Home - DiamondFacts.org Most people are unaware of the role diamonds play in bringing real benefits to people in the countries around the world where diamonds are sourced.
• Diamonds (1999) Cast/credits plus additional information about the film.
• Diamonds You need to use other radioactive decay schemes (e.g., uranium-lead) to date inclusions in diamonds. Inclusions used for dating are around 100 microns in
• Wholesale Diamonds and Diamond Engagement Rings - Delphi Diamonds Loose Diamonds and custom design Diamond Engagement Rings and Jewellery Specialists in Australia. Prices $100 to $1000000.