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It is the quantity of Gold which is applied on the ring.
It means your jewelry (ring, earring) is made of 14 karats gold and has a I-G (clarity, colorless) diamond.
K.P.G. = Kilometers Per Gallon it means plumb gold
The chemical symbol for gold is Au
"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.