F.P. Journe Tourbillon Souverain Set with Diamonds Ref. TJ Jewellery Platinum Diamond Dial

Two hundred and one brilliant cut diamonds sit on the dial of this one, about half a carat between them, set into white gold rather than around the case. It is the earlier of the two gem set tourbillons in the Journe catalogue, built on the horizontal cage and the 40 mm case rather than the later vertical one. Stones on a tourbillon dial are rare from a house of this size, and rarer still done well.

A platinum case at 40 mm, the standard size for the model. The dial is white gold with whitened guilloché silver for the time and the seconds, and the stones fill the field around those rings without ever touching them. Behind it the cage turns flat under an opening on the left of the dial, the constant force device holds the balance steady, and the seconds hand steps once and then stops.