My wife has given birth to a daughter and now I want to give her a diamond ring. Can you recommend where there is a good selection of such jewelry?

You're a great spouse for a baby gift. But I would recommend that you choose such jewelry together with your spouse, so that she likes the ring. And here is a selection of such rings is on the site http://pierrejewellery.com/katalog/engagement-rings I think there will definitely find the option that will not leave her indifferent.