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The notation ctw indicates that the carat total weightis...in this case 1.50 carats. The notation also means that the total weight is made up of a combined number of diamonds, and not the weight of a single stone.
It means that there are multiple diamonds involved that make a total carat weight (ctw) of .17 carats.
CTW or TCW expands to read carat total weight or total carat weight.In dealing with gemstones, when multiple stones are mounted in jewelry, the total carat weight of the combination of stones is advertised.A single gemstone of the same weight as the CTW or TCW of several stones will always be more expensive.
The term means that the total carat weight is 13. The value of these stones depends on their colour, cut, clarity and individual carat weight.
(2 + 12) ÷ 2 = 7 Note: mean is the same as average.