Plage Le Neptune, Cagnes-sur-Mer

What Seaglassmap found here

A working Riviera town beach, and a good one for glass. The finder who put it on the map spent ten days here and came away with a sorted boxful. Their advice is the useful part: the dry sand is full of raw, half-made pieces with sharp edges, so walk down to the waterline and search the wet strip, where the properly frosted ones are. Blues turn up. Sea glass is explicitly legal to take in France; the pebbles are not, so leave those.