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Gold won't tarnish, rust, or corrode, and though it's very strong,
it is also the most malleable of all metals.

Gold in its pure form (24ct) is too soft to withstand abrasions
caused from extensive daily wear, so it is alloyed with other
metals to give it strength. This strength makes gold an excellent
choice for a ring setting.
Common gold alloys are silver, copper, nickel, and zinc.
Gold colour is determined by the percentage of alloys that are
included in the metal. When gold is alloyed with silver, copper,
and zinc, the shade of colour will vary. When gold is alloyed
with nickel, copper, and zinc, it becomes white gold.
Yellow gold and white gold have very similar strength and malleability.
White gold looks very similar to platinum, but the two have very
different properties and prices.

The purity of gold is measured in carats, which are expressed
in 24ths. So 24-carat gold is pure while 18-carat gold is 75 percent
gold and 25 percent alloy.

The price of gold jewellery is dependent upon the purity of the
gold used or carat weight, as well as the design and construction
of the piece of jewellery.
When the carat weight or the gold percentage of the jewellery
is high, the yellow colour of gold is brighter, raising the value
of the jewellery.

Keep your gold jewellery away from harsh chemicals such as chlorine
and cleaning fluids. This will reduce daily abrasions and prolong
gold's lustre.
To clean gold jewellery, use a solution of warm water and detergent-free
soap and wash gold gently with a soft-bristled brush (a dull tooth
brush works well).
Store gold pieces separately in soft cloth bags or original boxes
to protect them from the exposure to harsh daily elements.
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