Sajen Green Chalcedony (likely Chrysoprase) Necklace Multi-Strand, 20" long

This is a tough one for me to describe, but I've done some research and I believe this is green chalcedony (specifically Chrysoprase). (I'd originally thought it might be jade, but I don't think so! There's a possibility it's something else, such as dyed quartz or calcite, as well. But I think it's chalcedony). These stones are a light to medium apple-green color with some brownish and white inclusions. They’re irregular nuggets, polished but not faceted, strung with knots between them. The large pendant shows a bit of matrix (the veining you see), which is common in some semi-precious stones. Anyway, it's a multi-strand necklace, 20" long when stretched out. It's quite nice and has its own special box. It's got a "Sajen 925" mark on it, but IDK what the 925 refers to, as I don't see much metal on it aside from the tag itself. Very elegant, though. IDK how old this is. Perhaps from the 90s or even earlier. It came from the estate of an elderly woman who'd passed. (I'm also listing a lapis one of the same design, if interested. See my other listings.)