Sudan Emerald Diamond White Gold Engagement Ring.
By Aamir Mannan Shaikh.
Cut emeralds
Emeralds, like all colored gemstones, are graded using four basic parameters–the four Cs of Connoisseurship: Color, Cut, Clarity and Carat weight. Before the 20th century, jewelers used the term water, as in "a gem of the finest water",
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