I bought these three months ago but waited to review until I saw how they held up.  They are perfectly round and very attractive.  The backing seems sturdy.  I wear them as my standard go-to earrings (most days of the week) and they still look good - in fact, they go very well with my other Mikimoto pearl jewelry that was far more expensive.  All in all, I am happy with this purchase and would certainly recommend this item to others.