You think Tiffany and you think diamonds, right? Fabulous baubles, right? Emeralds, rubies, pearls, even breakfast?

 But concrete?

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And yet, that’s exactly the material architect Frank Gehry has appropriated for his latest pieces for the jeweler. He’s used it in a fab bangle and a ring, both in his popular Torque design  --  bold, very modern, and, yes, quite lovely.

The light gray concrete pieces are backed with ridged sterling silver; the bracelet is $1,350, the ring, $375, both at Tiffany & Co., The Americana Manhasset and