Check the ring size. If it is 5 1/2 US the letter K could be the size. Letters are usually used for British made ring sizes, however many pieces made in United States have jewelry markings and hallmarks VERY similar to British hallmarks. Jewelry Manufacturers in the United States, often imitated or followed Britain's example.
Yvonne Hammouda-Eyre Antique Jewelry Investor
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W in Pennant Triangle by: Yvonne
Hi Diane the ring is art deco style, it looks like a transitional piece, you can see glimpses of the style elements of the proceeding era which was art nouveau, in the curvilinear style, the setting and the cut of the onyx. White gold and platinum were popular and so was onyx during the art deco period.
W in a pennant triangle was the trade mark used around the 1920s by J. J. White Mfg. Co. 144 Pine St. Providence, R. I.
Here is another piece by the same manufacturer that I thought you might find interesting as it features a black onyx like in your ring.
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