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Jewels in watches are usually synthetic rubies, and they are link used as bearings for the steel pivots of gears in the gear train; link steel against ruby, with a good oil, is almost frictionless. Using jewels for pivots started in the early 18th century, although it didn't start to become really widespread for another hundred years. A simple, time-only watch movement usually has 17 jewels, for every link pivot in the gear train, plus three in the escapement.

The Parmigiani Fleurier Toric Corrector case 42mm x 14.1mm 18k rose link gold with openworked sapphire glass dial sapphire caseback. Movement caliber PF252 hours minutes perpetual calendar with retrograde date moonphase accurate to one day's error in 122 link years minute repeater 45 hour power reserve running link at 18000 vph. Price 220000 for availability contact Parmigiani Fleurier. Visit the company online at Parmigiani .