Two Vintage Lucite Rings Clear with Applied Color & Design on Reverse VERY COOL!

Two reverse painted clear lucite rings. Rings are painted in layers on the underside of the top. Everything else is left clear. Each is a size 6.25. The one with pink has black designs along with the pink which predominates. This ring is flat on the top. The domed ring has pink and gold designs within black. These are very well done and both are in excellent condiiton. The lucite material is very clear, no scratches. I purchased these at an antique store so I don't know their history. I think they look really cool no matter what year they were made but they do look vintage, seventies would be my guess.