What is Diamond | Origins | History | Mining & Distribution | Diamond Jewels

Surface Properties

How is diamond like a newly waxed car? It repels water, an unusual property for a mineral. Diamond's strong bonding and carbon composition cause its surface to resist water but to readily accept wax and grease. These two properties present an effective means of separating diamonds from other minerals that come out of mining operations. Washed gravel containing diamonds is blushing with water over a sloping surface covered with a mixture of wax and grease, a "grease table." The diamonds stick to the table, whereas the wetted waste minerals wash over it. Gem diamonds voluntarily pick up a greasy film, but cleaning with ammonia or a good detergent restores their brilliance.

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