KMR135blk Coal Black Concrete Ring


KMR135blk Coal Black Concrete Ring



A Konzuk classic, this 7.5mm wide band, centers coal black concrete between stainless steel. Available in sizes 4.5 – 12. Custom sizes are available upon request, please email for details.

Prices shown in USD.


Materials Concrete + Stainless Steel
Size 7.5mm x 2.5mm
Lead Time 24 hours
Currency US Dollars

Custom Engraving

Max. 30 characters in Univers font


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.