karat is the global unit for measuring the purity of gold. Its history dates back to ancient times when the carob seed was a unit of weight.
How much is 40 karat of gold? - Quora
How we can identify the gold is either 24 or 22 karat? - Quora
What is the highest karat of white gold? - Quora
Is 22 karat gold considered pure? - Quora
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What are the factors to consider when looking for the best karat gold jewelry? - Quora
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What karat is white gold? - Quora
Which karats do I melt to get 21k gold? - Quora
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As I understand it, karats are a measure of gold's purity, so where does gold become more gold than other materials? Where is the majority? - Quora