It belongs to the mono-crystalline family of quartz.ĭesigned to withstand shocks without being damaged.Ī projection on the edge of a gear, escapement wheel, ratchet wheel, etc. Under certain conditions, it.Ī rock crystal that has inclusions of rutile that looks like golden hair. Quartz has the specific property of vibrating at a very high frequency (32 MHz) placed under electric current. The time the watch will continue to function before the mainspring must be wound. Pearls and cultured pearls are covered with nacre by certain species of oysters and mussels. The iridescent substance secreted by molluscs around a foreign object. Its principal characteristic is to have dispensed with the fusee and to have.Īn opaque ornamental stone with striations of deep and light green- Used by the ancient Egyptians in jewellery, today it is sometimes found on watch dials. French watchmaker and inventor of the calibre that bears his name. Kunzite has a hardness of 6-7 and a specific gravity of 3.1. The colour of some kunzite can be enhanced by irradiation. On a chronograph, a hand that makes one rotation every second, pausing four, five, even eight times to indicate quarters, fifths or eighths of a second.Ī transparent pink or light purple gemstone and is a variety of spodumene. Iolite is pleochroic a single stone will show up to 3 colours (in this case violet-blue, light blue, and yellow-gray). Iolite is a transparent, violet-blue, light blue, or yellow-gray mineral. In a watch, the train comprises a wheel whose teeth mesh with a pinion's leaves.Ī watch whose case has a front and back cover. Fluorite is such a mineral.Ī system for transmitting power and motion through toothed wheels. The ability of certain gemstones to transform invisible light (ultra violet light) into visible light. Cushion cut diamonds were cut in the 18th and 19th century.Ī valuable yellowish green, very lustrous and rare variety of the garnet group.Ī plating technique using electrodeposition.
In a "bent" index, this angle is smaller to reduce the distance between the stud and the pins. The balance spring stud and curb pins are usually within a 90° angle. Repeater watch (see complication) in which hammer and bell are replaced by a sharp pin which protrudes from the case to prick the finger once for each hour.A type of watch made after.
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