Help in identifying? photos attached!

hi! i picked up these 3 rings at the flea market today & hop you could help me ID them. the smaller one with a greenish stone has no initials, but on both sides of the shank it has stamped crossed arrows (you can sort of see them in pic3). just below the arrows on either side is a stamped swastika shape. the middle ring with the largest stone has “Do” stamped inside (try to see in pic 2). the coral & turquoise ring is stamped “AP” which i believe may stand for alice platero. none of them are stamped sterling or 925, though i’m confident they are sterling. the green stone is not malachite although it is opaque. it is a more jade-y color light & dark. the stones in the other rings are more blue-green than the pictures show & have some brownish coppery flecks. any information would be welcomed! thanks so much.

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The green stone may be amazonite [a feldspar]; I really cannot see them well enough to tell anything for sure. Your ring marked Do may be Joe Delgarito or perhaps Dan Oliver [although I think Oliver ‘O’ is bigger than yours]. I hope this helps to give you a starting point.