J.Crew Gold-Plated Magma Necklace Nwt. Style Bg685. Retail $98.00. Item Bg685. Measurements: Measures 17.5" But Wears A Little Shorter Due To The Clasp. Material: Gold-Plated Recycled Brass Casting, Cubic Zirconia. Brand New And Never Worn. Smoke Free Home. Comes With The J.Crew Jewelry Bag.