Two Sterling Silver Art Deco Rings 6.25 6.5

Two beautiful art deci style rings 925 marked l with unknown stones. The silver tested positive for silver. I was told that the rectangular ring had blue sapphire but it looks like the stones may actually be crystal or glass according to my gen tester. Although I am not sure if my gem tester is working properly. The sizing is as close as I could figure out. I believe the blue one is 6.5 and the light green is 6.25 Excellent pre-owned (vintage?) condition.