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Cat's eye (chatoyant chrysoberyl) is a yellow to green-yellow to grey-green stone with a bright, pupil-like slit that seems to move slightly as the stone is moved.

Most Cat's eye is cut as cabochons to maximize the distinctive pupil-like effect. This stone is sometimes enhanced by irradiation (this process improves the colour and accentuates the stone's asterism).

The majority of cat's eye chrysoberyl is found in Brazil.

Cat's eye chrysoberyl has a hardness of 8.5.

Two-handled vessel, used for drinking gruel.

Celtic jewellery was made by the Celts in Ireland, Wales, Scotland, and Brittany. The Celts used bronze, silver and gold in their jewellery and stones like cairngorm and amethyst.

Circular brooches with a long, hinged pin, called penannular brooches, date from ancient times.

The earliest-known piece of Celtic jewellery is the Hunterston brooch from 700 A.D.

Chalcedony is a family of minerals (microcrystalline quartz) that are often milky to grey to bluish in colour.

Chalcedony includes: Agate Carnelian waxy red Chalcedony blue Chrysoprase green Onyx black and white Bloodstone Sard brownish-red Jasper hornstone Seftonite

and others.

Chalcedony is porous and translucent.

Chalcedony has a hardness of 6.5-7 and a specific gravity of 2.6.

Champleve, also called email champleve, means sunken enamel and is a method of applying enamel to metal in which the design is first outlined on the metal surface by cutting lines into the surface. The engraved grooves are then filled with enamel, then fired to a glassy sheen, and polished.

Champleve is similar to cloisonne, but not as delicate.

See also Cloisonne

The part of the dial of a clock or watch on which the numbers are marked.

Large circular or oval dish or plate, often richly decorated.

A charm bracelet is a type of bracelet, from which a number of decorative charms are suspended. They are made mainly from gold or silver but other inexpensive materials are also used.

Charm bracelets have been popular throughout the 1900’s and continue to be today, as the variety of charms has greatly increased.

Chatelaines originated in Europe and are derived from the ornaments worn by the medieval lady of the castle – the chatelaine; later it became the badge of the housekeeper in a large establishment.

The chatelaine hung from the belt, with all the components such as the keys to store cupboards, scissors, thimble, bodkin and other useful objects suspended on swivelled chains from the belt plate. Gradually the chatelaine became a piece of jewellery in its own right, with beautifully fashioned small objects dangling from it. Often the belt plate was highly ornate and set with jewels or enamelled, whilst objects hanging from it might be in gold or silver.

By the 1850’s, steel was a favoured metal, but so ornate as to be almost unrecognisable. (See also Biedermeire Jewellery). By the early 1900’s the fashion for chatelaines had waned, and it had become, once more, an object worn for its usefulness by shop-workers, seamstresses and the like. Today they are only used as a collectors’ item.

A châton setting (also called coronet or arcade setting) is one in which the stone is held in by many metal claws around a metal ring.