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Probably within the last 30-40 years, since they are inscribed by lasers. Initial documentation about using lasers in the diamond industry is dated in the early 1980s.
No, but a diamond is.
Diamond.
You have spelled it correctly: diamond.
One carat is equivalent to 100 cents in diamonds. Carat is a unit of weight used to measure diamonds and other gemstones, with one carat equal to 200 milligrams. The term "cent" is commonly used in the diamond industry to refer to a hundredth of a carat. Therefore, 1 carat is equal to 100 cents in diamonds.