| Cabochon | A smooth round or oval convex-shaped, polished gemstone. In watch terminology, it describes a decorative stone set in the watch. |
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| Calendar | A watch feature that shows the date and sometimes the day of the week and the month. |
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| Case | The metal housing of a watch's parts. Stainless steel is the most common type, but titanium, gold, silver, and platinum are also used. |
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| Case Back | The cover for the back of the watchcase that is removed to access the watch movement for service. |
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| Chronograph | A multifunction sport watch with a stopwatch function. Most have two or three subdials, or minidials, for measuring minutes and hours. |
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| Chronometer | The chronometer indicates that the watch is in perfect running condition with high degree of precision according to the Official Swiss Chronometer Testing Institute standards. |
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| Clasp | The attachment used to connect the two ends of the watch bracelet or strap around the wrist. |
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| Countdown Timer | Lets the wearer keep track of the time remaining in a preset period. Particularly useful for sporting events. |
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| Crown | The ridged winding knob on the right side of the case that is used to set the time (and date). On a manual watch the crown doubles as the winding mechanism to power the watch. |
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| Crystal | The clear cover over the watch face or dial. Crystals can be made of mineral, synthetic sapphire, plastic, or acrylic material. The sapphire crystal is the most durable. |
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| Crystal Skeleton Caseback | A Caseback made of transparent material that reveals the intricate movement of the watch. |
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| Cyclops | A small window or lens in the crystal that is added to magnify the date 2 1/2 times. |
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