Vintage silver and gemstone ring duo from Thailand

These rings are crafted of raw rubies, paired with raw emeralds in one case. Neither is marked, but the ruby ring, which also has marcasites, is jeweller tested as solid silver, while the other is in plate, with great etching details. They are in very good condition, with one of the rubies missing from the ruby ring (hard to notice as it's on an edge), and three from the one paired with emeralds. The ruby ring is size 5-3/4, the one with emeralds is size 6.