What should I gift my friend for her seventieth birthday?

I’ve got a string of very pretty, pink freshwater pearls that cost me $25; in a black velvet pouch, that I bought for a few dollars.

I usually stick to the $25-$45 mark for her gifts, as she’s not a close friend and I don’t have much money, but lots of friends for whom to shop. Should I add on anything, like a dog poster or a silver plated jewellery box, or is what I’ve got her enough? Should I save one for Christmas and another for her next birthday?

What should I gift my friend for her seventieth birthday?
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