Vintage Delft Medalion Necklace - Made in Holland

Beautiful medallion necklace. The Delft is definitely Porcelain but unsure of what the filigree and chain are made of. There is some tarnish, but not hallmarked, so simply can't say silver. A small tag attached says made in Holland. The medallion, including the filigree measures 1 5/8" across the back. The chain measures 22.5" in total length. Excellent vintage condition.