ND 925 Italy Chain and Sterling 9K Butterfly Gold Toned Vintage

Butterfly pendant is unique in that the Antennae are used as part of the bale. The butterfly is marked Sterling and 9K. The chain is marked ND 925 Italy. I cannot attest to the markings as I am not a jeweler. The chain is long. Both pieces are gold toned. I gently cleaned but did not attempt to polish with a stronger cleaner. The filigree has indented spots, not sure if it is design or missing stones.