what kind of frame material do you suggest for my grand mother?

[glasses lens]

next Dec. 27th is my grand mother's 70 birthday, what do you think of buying her a pair of quality and great looking reading eyeglasses? As the last pair has been broken by my naughty niece, I want to buy pattern design on the frame legs, nowadays, what kind of eyeglasses frame is most popular for old ladies?, Her Rx is:
OD: +1.75 OS: +3.25
And, another question, what kind of frame material do you suggest?
Waiting for you kind answer!

[eyewear]

how about TR 90 plastic frame?
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