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Step 1
Get familiar with the six main types of lamps: floor, desk, hanging shade, wall sconce, table and chandelier. Most traditional lamps have brown-brown-green patinated bases, but some showcase silky, opulent dore patinated bases. Fat hollow bases usually held liquid for fuel-burning lamps before electric lamps became common.
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Step 2
Know that the first and simplest Tiffany lamps use favrile glass. The term "favrile" stands for "handcrafted" and incorporates leaded, blown and stained glass in a hollow shade.
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Step 3
Look for the geometric patterned shades with pieces of leaded glass in common shapes like squares, ovals and triangles. The pieces are arranged on cone, panel glass and globe-shaped shades. Geometric shades boast either a smaller number of large pieces of glass or greater number of small pieces.
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Step 4
Recognize floral pattern shades that blend floral, vine, leaf and geometric elements. Floral designs come in two styles. Lamps with the "belted" style have a floral band across the base of an otherwise geometric shade while other lamps have an all-over floral design.
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Step 1
Identify cone-shaped lamp shades which top most Tiffany lamps. Cone shades usually wear a floral pattern along straight sides but often feature dragonfly decorations.
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Step 2
Find that floor lamps always wear the globe shape, usually extending from 12 to 18 inches in diameter with enough room to depict full scenes on the glass.
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Step 3
Recognize bordered lampshades. The irregularly-bottomed border usually occurs in globe shaped shades and features a scalloped or curved design along the shade rim. On the most luxurious and collector-sought shades, both the top and bottom undulate into waves or other designs such as curling branches and petals.
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Step 1
Look for old dirt in the cracks. Even the most diligent dusting leaves some dirt behind. Appraisers can distinguish between 100-year old dirt and new dirt masquerading as old.
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Step 2
Ignore stamps and engravings on the lamp base. Many reproductions plagiarize the Tiffany name in engravings that may be virtually impossible to distinguish from the genuine article.
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Step 3
Have a Tiffany expert appraise the lamp.












