Precious metals are rare metallic chemical element of high economic value. The best-known precious metals are gold and silver. Other precious metals include the platinum group metals: ruthenium, rhodium, palladium, osmium, iridium and platinum. Rhenium is a precious metal that is not part of the platinum group or one of the traditional precious metals.

The Istana Nurul Iman palace domes are made of gold-leaf. It is the official residence of the Sultan of Brunei, Hassanal Bolkiah.

Gold is the most malleable and ductile metal; a single gram can be beaten into a sheet of one square meter, or an ounce into 300 square feet.

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.Marks – Arts & Crafts makers such as Kalo always marked their work. Other makers like Oakes marked just some of their output. And a wide range of well-made
. Mark: PLASTIGOLD — September 1940
. Mark: FETHAGOLD — August 1945 — used for plated plastic jewelry.
. Dates: 1930, closed 1998
. Founded: silver jewelry marks
. Location: New York, NY, USA
. Notes: Some designers for Accessocraft were: Theodore Steinman, Philippe Israel, Edgar Roedelheimer, Robert Appleby amd Albert Freedman. (information from Costume Jewelry 202 by Julia Carroll)

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