I have had this bracelet since the late 70's but have worn it maybe twice. It is in very good condition, but it does have a tiny chip on one of the onyx squares (see last photo top right). I, personally, didn't notice the chip until I looked closely at the bracelet. There is a sterling mark on the rectangle portion see photo #5.
I had to use the loupe to read it. Jade, onyx and tiger eye stones are cut and set into a checkerboard design with sterling silver atop the square of stones, both top and bottom, somewhat like a bezel setting. A truly unique and one of a kind bracelet. It could be Native American, but not certain. Three rounded cords of sterling meet at the rounded ends. I couldn't find a maker's mark. Just so you know, the bracelet is lightweight. I will be adding more and clearer photos soon. Thank you for viewing this item and please check my other items.