Determines whether blue zircon, inadvertently altered to brown by exposure to long-wave UV radiation, can be restored to its original colour through the use of incandescent light.
Read MoreA treatise on the design, display, care and repair of fine gemstones.
Read MoreThis article reviews the history of the conch "pearl," discusses S. gigas and its fisheries, and examines the gemmological properties and other characteristics of this attractive material.
Read MoreSeveral pearl-in-chicken cleaning experiments are carried out to test the validity of recipes from an ancient Egyptian source.
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