This amazing ring is an original era piece.
925 - sterling silver
size 6 US. It is sizable within a large range of sizes.

The top of the ring measures 3/4" in diameter and rises 7/16" high off the finger. At the center of the setting the malachite cylinder has a diameter of 1/2" (19mm x 11mm, 12mm).

This ring is in good overall condition and in my view it presents much better than the photos in person. There are some nibbles, chips and surface scratches to the malachite cylinder. The patina of the silver is consistent with being an original era ring and not a reproduction.