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https://www.gemsociety.org/gemstone-encyclopedia/
Our Gemstone Encyclopedia has information on over 300 gemstones, from traditional and popular jewelry standards to collector’s stones that rarely appear for sale. Each entry has photos and detailed information about the gem’s properties. Entries for jewelry stones also have price guidelines and discussions of their most important value factors.
https://www.gemsociety.org/article/gem-pricing-guide-sample/
Gem Price Guide. The IGS Gem Price Guide covers commonly traded colored gems as well as more unusual, collectible gems. Prices are retail in US dollars. Unless otherwise noted, all prices are for cut gems and all weights are in carats. Learn How to Use Our …
https://www.gemsociety.org/article/tourmaline-jewelry-and-gemstone-information/
Jul 27, 2020 · Tourmaline Value, Price, and Jewelry Information. 1.99-ct bi-color tourmaline, Mozambique. Photo courtesy of liveauctioneers.com and Kissing Auction. Tourmaline is a name applied to a family of related minerals with widely varying properties.Colors: All
https://www.gemselect.com/other-info/best-value-gems.php
Mar 17, 2008 · Tourmaline. Durable at 7 to 7.5 on Mohs Hardness scale, good brilliance and fire, the best choice of colors in the gemstone world, affordable in large sizes and usually untreated. Bigger gemstones can have uneven coloring. $20 - $300 + per carat, depending on size, Paraiba tourmaline $300 to $1000 + per carat.
https://www.thesprucecrafts.com/vintage-costume-jewelry-identification-value-4066126
May 13, 2020 · The large round stones in this parure are known as rivoli stones. The color of these glass stones is often referred to as "watermelon" by collectors due to their similarity to natural watermelon tourmaline. Juliana jewelry is not signed, but can sometimes be found with its original hangtag. Value: $512.99 (eBay 10/07)
https://www.gemsociety.org/article/turquoise-jewelry-gem-information/
Dec 24, 2018 · Accompanying value information: The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services. In terms of value, color evenness and saturation are the primary considerations. A turquoise’s capacity for taking a good polish without stabilization is …Hardness: 5-6
https://www.jtv.com/category/gemstones/loose/_/N-1936241390
Semi-precious gemstones are everything else. Pricing and the value of loose gemstones are decided by rarity, clarity, beauty of stone, demand, and defects. While there is no universal system for determining the value of a gemstone, the four C's (clarity, cut, color and carats) are used to help shoppers make educated decisions themselves.
https://kamayojewelry.com/jewelry/precious-stones-names/
Oct 28, 2020 · 2 Ruby. Ruby is a red precious stone that comes from the mineral group corundum, which is second only to diamond in hardness (9 out of 10 in the Mohs scale). An extremely rare gem, the red gemstone is more expensive than white diamond, and is the second most valuable precious stone in the world next to red diamond.
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