BVLGARI Bulgari  18K  White Gold Chain Necklace 17”” 18”” 19.5” Adjustable in good pre-owned condition. I bought it last summer but hardly wear it.  eBay did authenticated. It weigh approximately 23 gram from my kitchen scale.  I think the model is BVLGARI CATENE.  Can wear by itself or with a pendant.