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Isle of Man 2015 - 175th Anniversary of the Penny Black Stamp-Proof Fine 999.9 1/5oz Gold Crown.
The different gold alloys commonly used in dentistry have a karat value ranging anywhere from around 10 to 22. 1  At 10 karats, the alloy is about 40% gold. 2  At 20 karats, it's roughly 80%. 3  Probably on average, the typical yellow-colored gold dental crown is around 16 karat (67%).