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My engagement ring is the 123-ring and I love it. My 123-ring is in titanium and has been complemented as tasteful and classy.
I would recommend trying rings of similar width and height before ordering just to make sure if you'd like one a bit thinner or other alterations. I chose the titanium one, which is smooth and shiny. Korus gives you plenty of information about different materials, which you should read carefully before making your decision. There is a lot of misinformation about pure titanium jewels.
Ordering the ring online made me a little anxious, because you can't return made-ti-order -jewels. But in case you are not satisfied they do promise to exchange your order to a product of similar value. This made me happy.