well my ring is a .60 and is stamped 60 so im assuming it means you have a .20 stone
Another Answer
The markings on the metal cannot be trusted to reflect any information about the stone mounted in it. Metal markings give information about the metal.
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It means 20 karat gold
it mean's that your item is 1/20 percent of 12k gold don't try to turn it in its not valuable at all sorry.
It means that the Gold on the metal you have is actually Gold Plated. 120 stands for 1/20, which means since it is only a plating, it is only one-twentieth it's weight in actual gold.
US $20 gold coins are made of 90% gold, which puts it at about 21 1/2 kt.
"Plaque" on a watch case typically refers to a layer of gold or another precious metal that has been applied to the surface through a process like electroplating. The "g" likely stands for grams, indicating the weight of the gold used in the plating process. The measurement of "20 microns" refers to the thickness of the gold layer, with one micron equaling one-millionth of a meter. This measurement indicates the quality and durability of the gold plating on the watch case.