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2. Peridot - Wikipedia

   en.wikipedia.org/wiki/Peridot

   The visible-light spectroscopy of the same Chinese peridot samples showed light bands between 493.0–481.0 nm, the strongest absorption at 492.0 nm. [14] The largest cut peridot olivine is a 310-carat (62-gram) specimen in the gem collection of the Smithsonian Museum in Washington, D.C.

3. Rapaport Diamond Report - Wikipedia

   en.wikipedia.org/wiki/Rapaport_Diamond_Report

   Each grid has the clarity options on the horizontal line and the color options on the vertical line. In order to calculate the price of a diamond according to the Rapaport Price List, you need to know the size, color and clarity of the diamond. The price listed based on this information is in hundreds of dollars per carat. [3]

4. List of diamonds - Wikipedia

   en.wikipedia.org/wiki/List_of_diamonds

   A 5.05-carat (1.010 g) Emerald-cut red diamond formerly known simply as "Red Diamond". This is the second-largest known red diamond. It was cut from a 35-carat (7.0 g) piece of boart discovered near Lichtenburg, South Africa. It reappeared in 2007 after a 37-year absence from sight, and was purchased by Kazanjian Brothers Inc. —

5. Move over diamonds, these little-known gemstones are heating up

   www.aol.com/move-over-diamonds-little-known...

   Lily Gabriella's "Memphis Deco Pin," is crafted in 18-carat rose gold and platinum and features a 7.34 carat grey spinel cushion, princess cut pink sapphires and custom cut lapis lazuli (price on ...

6. Charoite - Wikipedia

   en.wikipedia.org/wiki/Charoite

   Common tradenames include charoite jade and lilac stone. Although considering its rarity and only type locality, even the highest quality charoite gemstones cost only a few dollars a carat, usually costing between 1.10 - $3 per carat. [9] [10] In its price, color and chatoyancy are the main

7. Diamonds as an investment - Wikipedia

   en.wikipedia.org/wiki/Diamonds_as_an_investment

   The price matrix for brilliant cuts alone exceeds 1,400 entries, and even this is achieved only by grouping some grades together. There are considerable price shifts near the edges of the size bands, so a 0.49 carats (98 mg) stone may list at $5,500 per carat = $2,695, while a 0.50 carats (100 mg) stone of similar quality lists at $7,500 per ...