Prong Set Aquamarine In Sterling Silver on Box ChainThis gemstone prong necklace is cast in solid sterling silver with a 16mm aquamarine set in the center. It is 3 4 of an inch round and hangs from a 1. 4mm adjustable stainless steel rounded box chain that can be clasped anywhere between 16 and 20 inches. Each aquamarine stone varies slightly and may not exactly match the photo. Handmade in my Oakland, CA workshop. Items are shipped First Class Mail with tracking.