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2. Hierarchy of precious substances - Wikipedia

   en.wikipedia.org/wiki/Hierarchy_of_precious...

   The measurement of sales of popular music starts high relative to the wedding anniversary scale, concentrating on gold and platinum (see gold album).Likewise, credit card companies usually have a "gold card" and a "platinum card" (many formerly had a "silver card" then followed by a "gold card", but due to similarity in appearance between silver and platinum these were often discontinued with ...

3. Colombian emeralds - Wikipedia

   en.wikipedia.org/wiki/Colombian_emeralds

   It is estimated that Colombia accounts for 70–90% of the world's emerald market. [1] While commercial grade emeralds are quite plentiful, fine and extra fine quality emeralds are extremely rare. Colombian emeralds over 50 carat can cost much more than diamonds of the same size. [citation needed]

4. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Group of precious and semiprecious stones—both uncut and faceted—including (clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem , jewel , precious stone , semiprecious stone , or simply gem ) is a piece of mineral crystal which, when cut or ...

5. 40 of the most expensive celebrity engagement rings of all time

   www.aol.com/news/40-most-expensive-celebrity...

   From Gwen Stefani's $500,000 sparkler to Mariah Carey's 35-carat emerald-cut diamond, here are the most expensive celebrity engagement rings ever.

6. 10 Most Expensive Sunglasses in the World and What They Cost

   www.aol.com/10-most-expensive-sunglasses-world...

   Here are the 10 most expensive sunglasses in the world and what they cost. ... Gold & Wood 253 Diamond — $55,000. ... Shiels Jewellers Emerald — $200,000.

7. Emerald - Wikipedia

   en.wikipedia.org/wiki/Emerald

   Unlike diamonds, where the loupe standard (i.e., 10× magnification) is used to grade clarity, emeralds are graded by eye. Thus, if an emerald has no visible inclusions to the eye (assuming normal visual acuity) it is considered flawless. Stones that lack surface breaking fissures are extremely rare and therefore almost all emeralds are treated ...