Antique Moon Necklace ROSE GOLD Brooch Pendant French genuine Diamond Victorian PIN Hallmarked

This originated from Paris and was passed on to a family who eventually moved to NY. 3 or 4 generations back, with no heirs, this was sold at auction and we were fortunate enough to purchase it. THis is 18kt or 22kt higher ROSE gold with 7 ( lucky 7) genuine diamonds set in white gold or platinum stars. There are a few French hallmarks on it and the one I could make out the best is a horse's head with what looks like an hour glass with a flat bottom and top. ( see photo) The hallmark depicted here ( the horse head) is a French hallmark that was struck in gold jewelry. It was used between 1838 and 1919.Before 1910, French platinum jewelry may have a maker's mark, but it was not hallmarked, which is why I think the white metal maybe platinum. As you can see from the exquisite cagework sides, this was a high quality piece. I found a pretty link 24" gold filled chain ( included in this sale) that the brooch fit nicely on. This can give you an idea of the different ways you can use such a wonderful antique piece. The 7 diamonds are crudely cut which makes me believe they were hand cut or on a machine that didn't use electricity. Possibly rose or diamond cut. All the diamonds were tested and are genuine. They measure about 2 cm's across and are flat on top ( on some). Assayed French gold is never lower than 18k which is why I know this is 18 or 22kt. IT is in fine condition and as I said, I am including the chain so you can wear it more than one way.