Gold is the most malleable and ductile precious metal on earth

Gold is the most malleable and ductile of all metals; a single gram can be beaten into a sheet of about 1 square meter, Gold leaf can be beaten thin enough to become translucent.

The transmitted light appears greenish blue, because gold strongly reflects yellow and red. Such semi-transparent sheets also strongly reflect infrared light, making them useful as infrared (radiant heat) shields in visors of heat-resistant suits, and in sun-visors for spacesuits.

Gold readily creates alloys with many other metals, like silver, platinum, and even aluminum which creates purple gold. These alloys can be produced to modify the hardness and other metallurgical properties, to control melting point or to create exotic colors.

Gold is a good conductor of heat and electricity and reflects infrared radiation strongly. Chemically, it is unaffected by air, moisture and most corrosive reagents, and is therefore well suited for use in coins and jewelry and as a protective coating on other, more reactive, metals. However, it is not chemically inert.

Because of it properties and rarity gold is a great medium for jewelry designing. Jewelry made from gold has been found dating back to the Byzantine era. Goldsmiths from this era used the most rudimentary tools like alcohol lamps and blow pipes to fuse and soldier there works.

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Silver

Silver is also a highly cherished jewelry metal for it beauty, color and properties. Not as rare as gold and it is easily tarnished by moisture, and and even the oil from your skin.