Two-layered Y-shaped long necklace

Love this piece, but I can no longer comfortably wear necklaces with shorter layers (makes me feel like I’m choking). Only worn once, in stellar condition. I think it’s gold-plated stainless steel. Not sure. Measurements: short chain - 16 inches, 2-inch extender; long chain - 18 inches, with 6.5-inch gemstone/chain hanging from the front