This is a brand new necklace. It has an 18” 925 sterling silver box chain marked AGI 925 Italy. The pendant setting is also marked 925, along with a tiny maker’s mark. I can’t see it clearly because it’s on the inside rim of the setting. The stone is a 6mm blue green sapphire. The pictures don’t do the color justice, but it’s a beautiful medium blue ocean color. I have two of these, and I’m keeping a third for myself!