Upcycled Repurposed Necklace

I made this pendant out of an old vintage earring that had lost its mate. I've attached this onto a very long chain that I had in my jewelry supplies, I didn't write down the measurements 📏 but it's about 100,000 ft long. 😊 I will come back and edit this listing to include the exact length of the chain. Earrings border has a gold rim, black enamel and oversized white pearl in the center. I don't know the metal content of this high-fashion costume jewelry piece.