We got hers at Kay, it's a sterling silver ring (Gold gives her a rash) with a sapphire center stone and cubic zirconia accompanying gems. Kinda close to this one
Mine is Tungsten carbide and looks like they're under $20 these days. Example
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Metal Masters Co. Men's Bla...
Double Accent 8MM Stainless Steel Black Anodized Card Ace Wedding Band (Size 8 to 13), 9