gold ring with glass and diamonds

An 18 carat rose gold and ring with a hexagonal concave element with dark green, transluscent glass over which a silver diagonal grid set with rose cut diamonds, the shank is florally engraved and with a three forked hoop with scrolls, the shank has been marked with an old mark possibly a weevel as an old French import mark and with modern French assay marks for 18 carat gold and silver, the owl and the swan, second quarter of the 19th century.

weight: 5.80 grams
size: 16.5 mm / 6 US
dimensions : 23 x 13 mm