Grit Lapidary
How To Make A Gemstone Lustrous By Polishing It
Cutting and Polishing gemstones
The shine given to the surface of a stone -either by rubbing it with grit or powder, or against another stone – is its polish. It can also be said thet polishing is the systematically progressive reduction in the size of scratches until they are invisible to the naked eye.. Polishing of a gemstone is done by the use of very finely powdered abrasives such as corundum powder, tripoli, pumice, putty powder, etc. Each gem material requires special treatment to obtain the best results. It is here that most of the trade secrets apply. In general, the polishing powder should not be quite as hard as the material to be polished, else it may grind rather than polish. The material should be used with water or oil to give it a creamy consistency. Dark-coloured gemstones and those that are translucent or opaque, for instance opal and turquoise, are often polished rather than faceted, as they are organic gems. Opal, being a softer rock require treatment more like that accorded cut glass, and soft abrasive powders, such as pumice, suffice to polish them. They may be polished as beads or as flat pieces to be used in inlay work, or cut en cabochon with a smooth, rounded surface and usually a highly polished domed top and flat base. Gems which are transparent are normally faceted, a method which shows the optical properties of the stone’s interior to its best advantage by maximizing reflected light which is perceived by the viewer as sparkle. There are many commonly used shapes for faceted stones. For example, a rough diamond crystal is fashioned into a brilliant-cut. This is the most popular cut for this stone because it maximizes the gem’s naturally strong light dispersion. The craftsman, or lapidary, who cuts the stone aims to show its best features, taking into account its colour, clarity, and weight. The facets must be cut at the proper angles, which varies depending on the optical properties of the gem. If the angles are too steep or too shallow, the light will pass through and not be reflected back toward the viewer. There are several stages in the cutting of a gemstone, each of which may be carried out by a different expert.
Read more about how gemstones are polished, engraved and carved
About the Author
Iris Dcosta
www.valuablestones.com
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Pro-Quality 20-Piece Diamond-Point Bit Set for Rotary Tool – Glass, Stone, Ceramic $1.10 Professional Quality, 1/8 in. Shank, 180 Grit. Includes 20 assorted shapes covered with diamond particles. All bits have 1/8 in. shanks and come in convienient plastic holder. Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing. Use on wood, jade, ceramic, glass, hardened steel, semi-precious stones and other hard materials…. |
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50pc DIAMOND BURR SET- Ceramics Tile Glass Lapidary for ROTARY TOOLS $14.15 Assorted shapes and sizes for your work. Use them to remove burrs on glass, metal, stone, wood, ceramics, fiberglass and plastic. Diamonds are nickel-bonded to the surface and are of fine to medium grit. Each has a 1/8” shank for use with motor tools, drills, high speed die grinders, and flex shafts. Set comes in a PVC case…. |
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3M 6002J Diamond Hand Pads – 2-1/4 x 3-3/4. 120 grit hand pad. $20.25 3M 6002J Diamond Hand Pads are simply the best diamond hand pads on the market. Long lasting and easy to use, the diamonds make short work of surface preparation on glass, stone, metal and ceramic. Easy to hold and easy to use. One 120 grit hand pad… |
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Lortone 3A Lapidary Rock Gem Rotary 3 Lb. Tumbler New $94.29 Lortone Model 3A Rotary Tumbler Great For Tumbling Rocks. This is a new Lortone model 3A rotary tumbler. It runs on 115V, 60Hz. This model 3A Lortone rotary tumbler is quite simple to operate and gives excellent finish to your stones. It has a molded rubber barrel with screw down closure Barrel interior. Holds up to 3 pounds. The barrel interior measures approximately 4″ diameter x 4″ deep (101 x … |
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