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Understanding Basic Jewelry Gemstone Terms

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Author Topic: Understanding Basic Jewelry Gemstone Terms  (Read 821 times)
Taogem
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« on: February 09, 2008, 01:21:24 am »

It is easy to feel intimidated and out-of-place when you are visiting a high-class jewelry store for the first time. To avoid making unwanted and uninformed purchases, improve your knowledge about jewelry starting with the tips below. If you speak the same language people in the jewelry industry speak then you all go home with the jewelry piece you want, need, and definitely can afford.

The Meaning of Gemstone

A gemstone may be a rock, mineral, or even a petrified material that is cut and polished to be used for making jewelry. It may even be harvested like pearls or organic material like amber, just as long as it has aesthetic appeal. In the old days, precious gemstones only referred to the Big Three: emeralds, sapphires, and rubies. Everything else was labeled as semi-precious gemstones.
Categories today, however, have changed and expanded to avoid further confusion.

The Ins and Outs of Lapidary

Lapidary refers to the process of cutting and polishing gemstones. Rough materials are left uncut and unpolished. Cobbed materials are referred to as fractured. Materials like silicon carbide and diamond, due to their hardness, are used for cutting gemstones in a progressive abrasion process. Compounds like aluminum and chromium oxide are, on the other hand, used for polishing gemstones.

Common cutting techniques include tumbling, drilling, polishing, lapping, sanding, grinding, and sawing. Cut gemstones are then polished into several forms such as sculptures, intaglios, cameos, mosaics, intarsias, inlays, spheres, beads, cabochons, and faceted stones.

Sawing The main tool used in sawing is a copper or steel blade with diamond grit on the edges. Water or oil is used to eliminate cutting debris and prevent the blade and stone from overheating.

Grinding

Diamond-impregnated grinding wheels made of silicon carbide are used to grind gemstones and shape them into a pre-form. Liquid substance is also used to prevent both the stone and tool from overheating.

Sanding

This process is similar to grinding but uses finer abrasives. It is often performed as a follow-up after grinding for removing scratches caused by the previous cutting technique. For round gemstones, a belt sander may be used to ensure smoother and rounder curves.

Lapping

A lap, which is a flat disk that is either vibrating or rotating, is used to create flat surfaces rather than round ones. The process however is similar to sanding and grinding.

Drilling

This technique is used if the lapidarist wishes to create a hole through or in a gemstone. Drilling tools may be rotating or ultrasonic.

Tumbling

A gemstone that is placed in a rotating barrel filled with water and abrasives is tumbled for polishing. These gemstones are usually roughly shaped and the polishing process is gradual and performed with interval washings. Sometimes, vibratory machines are used in lieu of rotating barrels. This way, the barrels vibrate rather than rotate. Tumbling techniques are also used to polish metal jewelry pieces.

Cabochons

Cabbing or cabochon cutting is achieved by gluing or dopping the gemstone into a metal or wooden dopstick or simply holding it in place. The cabbing machine then twirls and creates a round smooth surface top and a flat or slightly rounded bottom for the gemstone. This is usually an alternative to faceting for gemstones that possess too many inclusions.

Faceted Stones

Gemstones that have faceted forms reflect brilliant color and clarity from all sides and at all light levels. This technique is most suitable for transparent stones. Today, new techniques like grooves and concave facets are used to create new looks for faceted gemstones.
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kumf
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« Reply #1 on: October 24, 2015, 11:54:17 am »

This post is extremely helpful to a newbie like me. Thank you! :)
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