I believe that the earrings are guilloche enamel. Guilloche is a process where metal is treated to “machine-engraved decoration…over which a translucent enamel is often applied”. (pg. 266 of Warman’s Jewelry Identification and Price Guide 2002)
The earrings are marked 925 S and below that an E in a cloud. This is the mark for Elvik and Co. of Oslo, Norway. Metal has not been tested in my possession.
These measure approx. 1" tall by 1/2" at the widest point.
Condition is good. Perhaps not for the perfectionist. Light surface wear to the gorgeous enamel...each earring does have a tiny ding (a tiny sliver) or two in the enamel surface. Not particularly visible with the naked eye...but can be felt when a fingernail is gently slid against the surface. The gold washed silver has some patina and wear, but the majority is on the backsides of the earrings...unseen when worn. These have been worn, please expect normal surface wear. Issues are reflected in the price. Items are not polished in my possession. Please look closely at the photos.
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Vintage. Do NOT use liquid silver polish or harsh chemicals on pieces with stones (especially turquoise), as those substances will cause damage. A simple silver cloth will do, taking care to avoid the stones as much as possible.
Jewelry will arrive gift wrapped.