What is the difference between a uniform and a graduated strand of pearls?

When it comes to a uniform strand of pearls, all of the gemstones are classified as being of the same size. A graduated strand of pearls is composed of different sized pearls which are arranged on the strand according to size (the center pearls are larger and the pearls near the clasp, smaller). Uniform strands are much harder to come by, thus they are more expensive than graduated strand pearls. 

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