Vintage prong set rhinestone necklace sparkly

Vintage prong set rhinestone necklace gold tone metal, the rhinestones always reminded me of topaz ( my birthstone) the reason I purchased it. Only worn a few times been displayed in my curio these many years . Weighs 42 grams on my kitchen scale . Mannequin's neck is ~ 15". The necklace measures ~14" with a ~2" chain extender, ruler in pictures above, Questions are always welcome. Hook clasp special occasion, date night, wedding guest, formal, prom , cocktail party ,