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Why are gemstones valuable?
Because of their value and portability gems have often been used instead of money. Traditionally, their size is given in carats, which is a term of weight (1 carat = 0.2 gram).
A stone's value is determined by its quality and size. This is stated, as a rate per carat. The rate per carat is then multiplied by the actual weight of the stone to give a selling price. Large or special stones have an additional premium value.
Because synthetic gemstones can be produced to order in a laboratory, their value is much less than that of their natural counterpart.
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