Very nice. Don't know what you listed it as, but engraved enamel late Victorian bangles like this are most usually 'gold fill'... a thicker coating of gold than you would get from electro-plating but nevertheless not solid gold. Like this one:
The thickness of the plate means that they may well superficially assay as gold so, unless reputably/officially marked, it's wise to assume they have a non-gold core.
No markings. Solid gold though. The enamel is Taille d’epargne (champleve). You can usually spot the solid gold ones based on one very easy thing: The body is extremely thin and dents easily (they were saving gold). This one sadly has a few dents but they’re passable overall.
If you’re uncertain, cut into the tongue with a hard file (I like a full mm to be certain). Then you can test with standard gold test acids.