KMR157blk Coal Black Concrete Ring


KMR157blk Coal Black Concrete Ring



At 4mm wide, this coal black concrete and stainless ring looks like a plain stainless band at first glance. Upon closer look one sees the hidden detail of black concrete cast into the side of the band. Sizes available 5 – 12.

Prices shown in USD.


Materials Coal Black Concrete + Stainless Steel
Size 4mm x 2.8mm
Lead Time 24 hours
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Additional information


We use a new generation of concrete for our jewelry called ultra high performance concrete which has the compressive strength of 150 Mpa. Over 20 times stronger than traditional concrete. We offer a lifetime warranty on these rings, if the concrete were to chip or break at anytime, we will replace it.

Sizing Information

If you are unsure of your size, please visit a local jeweler to have your finger sized accurately. Be sure they use a wider sizer, close to the size of the ring as wider rings will fit tighter. Do not use sizing charts as they are always inaccurate.


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