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Isle of Man 2015 - 175th Anniversary of the Penny Black Stamp-Proof Fine 999.9 1/5oz Gold Crown.
The gold isotope, gold-198, is also used for the treatment of cancer. Gold is often combined with other metals for use in modern dentistry. The gold used for dental work, including fillings and crowns, is predominantly white gold or gold alloys. When white gold is used, the purity of the gold is usually 15 carat or higher.