This is more of an upper arm cuff than a bangle. The crossed parts move and naturally fit the upper arm. The material should be silver, but there are no hallmarks. I believe the stone is garnet. I've included a photo with a measuring tape to show the size. I've kept it at home for a long time, and it was completely black, so I polished it. It's still beautiful, and it's a rare type, so I hope you'll wear it. Please understand that this is a used item.