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Chatoyancy is the lustrous, cat's eye effect seen in some cabochon stones, like cat's eye, tiger's eye, and sometimes in other stones, like aquamarine.

In chatoyancy, light is reflected in thin bands within the stone. Chatoyant stones are cut in cabochon to maximize the lustrous effect.

The name given to a particular Chippendale design for a chair in the Chinese taste – Chinoiserie. It was supposed to resemble Chinese fretted work and is an example of the highly romanticised vogue of Far Eastern styles and objects which swept fashionable circles in the mid 1700's

Thomas Chippendal (1718 – 1779) was a designer and cabinet maker. He published 'The Gentleman and Cabinet-maker's Director' in 1754, reissued in 1755 and again between 1759 and 1762. He worked in London in St Martin's Lane at the sign of 'The Chair' where his son Thomas Chippendale the younger carried on the business after his death

Chrome diopside is an emerald-green colored gemstone.

It is a chromium-rich variety of the common mineral diopside (Calcium magnesium silicate).

Chrome diopside has a hardness of 5 to 6 and a specific gravity of 3.3 to 3.6.

An instrument for recording time with immense accuracy.

Chrysolite is a name used for many stones.

During Victorian and Edwardian time, it referred to green-yellow chrysoberyl.

It can also refer to peridot.

Long ago, the name was used to refer to almost any yellowish gem.

Cire perdu, French for "lost wax", is a process of casting metal in which the original model is sculpted in wax. The wax is entombed in clay, and the wax is then melted out, producing a hollow mould. The mould is then filled with molten metal. When cool, the clay is broken off and the cast metal remains.

A claddagh ring is an Irish betrothal ring.

The Claddagh ring, from the Irish: fáinne Chladaigh, is a traditional Irish ring given as a token of love or worn as a wedding ring. The design and customs associated with it originated in the Irish fishing village of Claddagh, located just outside the city of Galway. The ring was first produced in the 1600’s during the reign of Queen Mary II, though elements of the design are much older.

The Claddagh's distinctive design features two hands clasping a heart, and usually surmounted by a crown. The elements of this symbol are often said to correspond to the qualities of love (the heart), friendship (the hands), and loyalty (the crown). The expression which was associated with these symbols in the giving of the ring was: "With my two hands I give you my heart, and crown it with my loyalty." Yet, the expression, "Let love and friendship reign forever" can be found as another meaning for the symbols.

See also Engagement Ring

A clasp is a fastener that can open and close, attaching two things together, for example, the two ends of a necklace, or a pin to a garment. The clasp on a piece of jewellery can tell you a lot about the piece, including giving an indication of its age, by determining when that particular type of clasp was invented and looking at the wear on the clasp, its quality (better quality pieces generally have better-quality clasps), and its composition and manufacturer (the clasp is often where the maker's stamps are).

For example, the spring ring clasp was invented early in the 1900's; jewellery made prior to 1900 or so will not have a spring ring clasp.

Some other common clasps include the lobster claw clasp, the box clasp, the barrel clasp, the fold-over clasp, the hook-and-eye clasp, and the bar and ring toggle clasp.

Larger clasps are used to fasten girdles and belts whilst smaller clasps are used to fasten bracelets and necklaces. A slot does not attach some clasps for a belt, but have a hook(s) that is fitted into a hole(s) in the other end of the belt.

On some valuable pieces of jewellery there is an added safety clasp that is closed after the main clasp has been fastened, to prevent the accidental loss of the item.

The style of a chair or table foot, a lion's or an eagle's claw clutching a ball, gained increasing popularity throughout the first half of the 1700's and has been used a lot since on reproduction pieces. It went out of favour for fashionable furniture with the classical revival of the later 1700's