Can anyone please help me identify these hallmarks?

Recently acquired some jewelry from an estate we cleaned out. There is a large collection of turquoise necklaces, earrings, rings in conjunction with other vintage costume jewelry. There are markings on this pendant (JLC) and It opens and closes with a magnet. The set of earrings pictured have (R S with some symbol like a sun ray or something similar) that I have tried to research and cannot find information on. Does anyone know what these hallmarks are? Are these items of any value?

RS unidentified

https://www.art-amerindien.com/hallmarks/r-american-indian-jewelry-marks.htm

pendant is most likely an import silver tone metal faked turquoise

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The turquoise-colored pendant is a base-metal Asian import with a likely howlite stone, not Native American, not turquoise.

Close relative in Japan, asking $18:

https://paypayfleamarket.yahoo.co.jp/item/p1202561024

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