Foilbacking is a gemstone surface enhancement technique where a thin sheet of, sometimes colored, metal is placed behind the gemstone (backing) in order to reflect more light, and/or color, back into the stone and then towards the viewer.
Foilback: A method of coating the back of a stone with silver, gold, or colored foil. This enhances the brilliance of the stone, by reflecting back as much light as possible. It is commonly seen in costume jewelry.
Foilback
A foilback (or foiled stone) is a stone that has a metallic foil backing; this thin metallic backing is frequently composed of mercury and tin.
foilback
A gemstone that has a thin metallic foil backing it to make it more reflective and enhance its sparkle
fracture
See feather ...
FOILBACK - Any gem material that has an applied metallic backing to improve color, brilliance and/or phenomena such as a glass, rhinestone-accent stone, or other material.
A doublet, foilback, or any other assembled stone, can be a fake if it is mis-represented as a natural or solid gem, and when set in a closed bezel may look completely convincing.
FoilA thin sheet of metal placed behind a crystal or glass stone to make it brighter FoilbackA method of coating the back of a stone with silver, gold, or colored foil.
A foilbacked rhinestone whose foil has been damaged (often from water creeping in) does not sparkle anymore and is said to be a "dead" stone, lowering the value of the piece.
The metal acts as a foilback of sorts, increasing light return from the stone. Often, a silver-colored plating is added to the inside of this backing to further increase reflection.
Crystals, rhinestones, or acrylic stones that are coated on the back to increase the brilliance. The foilback can be damaged by glues that heat up, such as epoxies, so when repairing costume jewelry that has foilbacks, use white glues.
Foldover clasp ...
Later, as the power of the native rulers declined, foilbacked crystal often replaced precious gems in the kundan setting. At the same time, harder 22-carat and 18-carat gold began to be used. This was then polished and diamond-cut.
Physical Properties of Gemstones
The Crystallography and Forms of Gemstones
Types of Gemstone Deposits
Sources of Gemstones
Doublets, Coated Stones And Foilback
Identification By Double Refraction & Pleochroism ...
 See also: Color, Diamond, Shape, Surface, Gemstone
  
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