Composite gem stone and production method

Coating processes – Solid particles or fibers applied – Applying superposed diverse coatings or coating a coated base

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Details

427204, 427294, 156 61, 428 15, 428414, B05D 136

Patent

active

050154990

ABSTRACT:
Composite or assembled gemstones are usually made by laminating together several layers of rock or mineral substances. Established lapidary processes used in making these stones are very effective when the gem-material part of the composite stone is of stable composition. Such material can then be easily cut and ground into the smooth flat layers necessary for laminating. These same methods, however, prove much less effective when applied to poorly-consolidated gem material: material that because of its friable nature tends to chip and flake when attempts are made to cut it into layers. My process is designed specifically for use on this latter type of gem material and is especially suited to processing gem-quality fossil ammonite shell. This process differs from the traditional methods in that it eliminates the need for cutting and grinding the gem material into smooth, flat layers. Instead, the gem material is simply shredded or fragmented into a mass of small, thin flakes. These flakes are then sprinkled on to pre-finished, crystal clear, adhesive covered bases and are overlain by another sprinkling of a dark granular substance. The composite stone is ready for use when the adhesive sets.

REFERENCES:
patent: 3670060 (1972-06-01), Cuffaro et al.
patent: 4657791 (1987-04-01), Ukkonen
patent: 4664954 (1987-05-01), Hurd

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