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level: Silver, gold and platinum

Questions and Answers List

Question	Answer
What is the unit of measurement that gold is measured in?	Carat
What is the carat weight of pure gold?	24 carat
What carat of gold contains 37.5 percent pure gold?	9 carat
Aside from it's appearance, what makes gold ideal to use for jewellery?	It is very malleable
What carat of gold contains 75 percent pure gold?	18 carat
What metals are most often mixed with pure gold (alloys) to make 9ct and 18ct gold?	Silver, copper or palladium
Aside from yellow, what are the most common colours of gold available?	White and Rose
What does any item of gold jewellery over 1g, silver over 7.78g, and platinum over 1g need to be sold legally in the UK?	Hallmark
What is the name of the British coin made from 22ct gold, available in half or full sizes?	Sovereign
What is the name of the most common standard for silver sold in the UK?	Sterling
What is the percentage of pure silver in sterling silver?	92.5 percent
What is the most common purity of platinum sold in the UK, showing a '950' hallmark?	95 percent
What is the name of the metal most commonly used in jewellery, both as an alloy and stand alone, that is also a member of the platinum family?	Palladium
What is the name of the process where an item or a piece of jewellery is coated in a thin layer of another metal, such as gold, rhodium or silver?	Plating
What is used to plate white gold to give it a bright white colour?	Rhodium
What is contained in the air around us that causes silver to tarnish?	Sulphur