White gold jewelry typically is made from a gold-palladium-silver alloy or gold-nickel-copper-zinc alloy. However, about one in eight people experience a reaction to the nickel-containing alloy, usually in the form of a skin rash.
Composition. Electrum consists primarily of gold and silver but is sometimes found with traces of platinum, copper, and other metals. The name is mostly applied informally to compositions between about 20-80% gold and 20-80% silver atoms, but these are strictly called gold or silver depending on the dominant element.
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Gold will form alloys with most metals, but for jewelry, the most common alloying metals are silver, copper, and zinc. However, other metals may be added, especially to make colored gold. Here’s a table of the compositions of some common gold alloys:
The actual composition of AuAl 2 is closer to Al 11 Au 6 as the sublattice is incompletely occupied. Blue gold. Blue gold is an alloy of gold and either gallium or indium. Gold-indium contains 46% gold (about 11 karat) and 54% indium, forming an intermetallic compound AuIn 2.
It checks in at 91.67% purity (which in addition to gold is 3% silver and 5.33% copper). This is commonly referred to as 22-karat gold. Again, note that it contains the same amount of gold as the Canadian Gold Maple Leaf, which is 99.99% pure gold (more commonly referred to as 24-karat gold). Is Higher Purity “Better”?
Gold nuggets. Credit: Sick Chirpse. First and foremost, what makes a precious metal is its rarity. Rarer than silver or copper, two other metals mined since antiquity, its value was …
For example, for gold coins the user can select pure gold, 22 K gold, 90% gold, or American eagle gold; for silver, pure silver, sterling silver, 90% silver. and Britannia silver. Pure platinum, palladium, rhodium, and copper also have stored values.