Assembled Stones
An assembled stone is one that is constructed out of two or more materials. This category includes, for example, such creations as: doublets and triplets, intarsias and inlays, foilbacks and Mabe pearls.
Assembled stone: Any stone constructed of two or more parts of gem materials, or one of gem and one of glass.
B Top
Baguette: From the French, meaning rod. A style of step cutting for small, rectangular shaped diamonds.
Assembled Stone: Layers of stone or synthetic material "sandwiched" together to imitate a gemstone. Garnet and glass doublets are assembled stones and frequently seen in antique jewellery.
Assembled stones - Composites of colored stones and glass or a cheaper grade of similar color stone. Called doublets or triplets, with full disclosure, this is a good way to have the beauty of a ruby, emerald or tanzanite at a fraction of the price.
Assembled Stones and Other Imitations. There are many assembled stones that resemble jadeite. These include triplets made by taking a highly translucent piece of pale-colored jadeite and cutting it as a thin, hollow cabochon.
An assembled stone of two material bound together with a colorless cement
Dwt.
The abbreviation for penny-weight which equals 1/20 of one troy ounce.
DOUBLET - An assembled stone of two portions bound together by a cement or fused together by heat. An opal doublet, for example, may be opal cemented to black onyx with a black colored cement.
Doublet
An assembled stone of two parts. Colorless cement or heat is used to join the parts together. Often used with Opals.
Composite gems (assembled stones)
The separation plane of a ruby doublet is visible at the girdle. This doublet consists of a natural green sapphire crown on top of a synthetic ruby pavilion.
Natural opals are also found in composite or assembled stones called opal doublets or triplets.
Such stones are sometimes called an 'assembled stone'.
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson ...
Unfortunately, full disclosure seems to be the exception rather than the rule in the marketplace. Here are a few examples of some of the methods frequently used: heat treatment, irradiation, impregnation,assembled stones.
Heat treatment ...
 See also: Natural, Stone, Gem, Diamond, Gemstone
  
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