HM3 Frog Zr

PURPLE IS THE NEW BLACK… The new Black Frog, that is.

Until recently, the world's rarest frog was thought to be Isthmohyla rivularis, from the rainforests of Costa Rica. Now, however, that tiny tree frog's place in the record books has been taken by a new amphibian: the Frog Zr by MB&F, a limited edition of just 18 pieces.

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Frog Zr ? Zr is the chemical symbol for zirconium, a metal resembling titanium – but tougher! To give an idea of just how tough zirconium is, the blades in modern jet engines can only support the incredibly high temperatures and stresses they generate thanks to a protective ceramic layer of zirconium and yttrium oxide.

We introduced the HM3 Frog in 2010 to bring some fun into high-end watchmaking. The Frog Zr is no exception: underneath its tough black PVD zirconium skin, the flamboyant purple 22K gold rotor reflects hints of green and yellow…