I worked with Gottlieb & Sons products at a fine Jewelry store for 5 years and their quality is great. They really cover a wide spectrum of price points and are super easy to work with. I like they're a Cleveland family owned company too. Hope this helps!
CP
They are pretty well made, esp considering they are a "higher priced" brand. I have only been told of one issue by a jeweler that was related to how hard the person wore her rings that in 4 years theyd rubbed themselves together so hard that the diamonds were loosened. And these were beadset/channel style rings.