NOBLE METALS: GOLD, SILVER, & PLATINUM
Among the noble metals, gold reigns supreme. It has awoken love, desire, and greed. Empires have been building on gold, and civilizations have been destroyed by it.
Gold - It can be dissolved with hot chlorine bleach, selenic acid in water, a hot cyanide solution, and a mixture of nitric and hydrochloric acids, thus Gold is very durable. Gold is wonderfully workable because no other metal is more ductile or malleable. One ounce can be drawn out into a wire thread of more than 50 miles long.
Pure gold is expensive and soft; metalworkers alloy gold with at least one other metal. Karat refers to the relative fineness of gold in the alloy. It tells the number of parts, by weight, of gold in 24 parts of alloy. The gold content of an alloy is indicated by Karat stamping.
|KARAT||PARTS GOLD||GOLD PURITY||FOREIGN STAMPING|
SILVER - has drawbacks, it tarnishes easily, and if you neglect it, it will turn almost black. Silver is less durable than gold or platinum, but is a more solid heat conductor which makes it harder to work with than other metals. Silver has a nice feel to it and takes a high polish.
STERLING SILVER - must be at least 92.5% pure (The rest is usually copper)
THE PLATINUM GROUP - Platinum is rarer than gold. Its grayish-white color and non-tarnishing quality makes it a preferred setting for colorless diamonds. Platinum occurs in association with other rare metallic elements known as the platinum group of metals. Jewelry platinum is usually 90% platinum and 10% iridium.