|Cabachon, Annual Calendar, Gregorian Calendar, Full Calendar,
Julian Calender, Perpetual Calender, Caliber, Cannon, Chapter-
Ring, Carousel, Carriage Tourbillon, Case, Center-Wheel,
Champleve, Chime, Chronograph, Chronometer, Circular Graining,
Cloisonne, Clous De Paris, Column-Wheel, Complication,
Corrector, COSC, Cotes Circulaires, Cotes De Geneve, Counter,
Crown, Crown-Wheel| Any kind of precious stone, such as
sapphire, ruby or emerald, uncut and only polished, generally of
a half-spherical shape, mainly used as an ornament of the
winding crown or certain elements of the case. An intermediate
complication between a simple calendar and a perpetual calendar.
This feature displays all the months with 30 or 31 days
correctly, but needs a manual correction at the end of February.
Generally, date, day of the week and month, or only day and
month are displayed on the dial. With respect to the Julian
Calendar, the calendar reform introduced by Pope Gregory XIII in
1582 corrected the slight error of the former cal