*** FINAL REDUCTION. ***
These earrings appear to have been re-purposed from a mid-Victorian era (circa 1860) book chain necklace - perhaps from the piece that hung in the center of the chain the hold a locket. Alternatively, they could have been made to match such a chain from the very start, however as screw-back earrings weren't invented until just prior to 1900, and the gold is both 14K and 10K, I find this less likely.
Regardless, what I do know is such. The screw-back portions are crafted in solid 10K yellow gold, and hallmarked as such upon the back. They do bear a maker's mark of a crown (see photos) but since that was a commonly used hallmark, it has not assisted me in identifying their maker. (I have also acid tested the link portion of the earrings and the brighter gold links test as 14K while the oxidized links test as 10K).
The earrings each have three book chain links, two bright gold links and a final oxidized link with a flower applique. They dangle slightly lower than the ear lobe when worn and have a nice bit of movement and jingle, without being garish.
They measure 0.82" from top to bottom, with a maximum width of 0.53" from side to side. The backs are screw back, so they are suitable for both pierced and non-pierced ears. The pair together weigh 3.91 grams.
Condition is very good, with no repairs. One of the earrings does has a small dent where the oxidized link goes through the middle link.