Gem Focus July 2020: Pariba Tourmaline
Clarity enhancement; probably the oldest gem treatment method...
*Gem Focus & Market Pulse (Free Subscriber)Diamond Market News
The diamond market around the world, and especially in North America, has entered unknown waters as far as accurately predicting what’s coming down the pipeline. Diamond “experts” continually weigh in with their predications of what…
Diamond MarketHeat Treatment Experiments of Corundum – Development of a Before/After Collection
Color modification of ruby and sapphire by heat treatment processes has a long tradition in the gemstone industry. First written reports by Bhojarajah and Al Beruni date back to the 11th century (see Hughes, 2017),while…
Featured ArticlesDemand and Someone Will Supply
Sometimes the most basic of questions is the best question. For example, why do markets exist? Most everyone has heard about “supply and demand.” To be blunt, one should view the relationship between supply…
The Appraiser's NotebookColored Stone Market
In Asia, jewelers report improving sales as consumers spend on luxury. In the USA, cautious mood greets traders as more markets emerge from COVID-19 closures. A range of colors are expected to see good demand…
Colored Stone MarketParaiba Tourmaline
Tourmaline is one of the most popular and complex gemstones and has a long history. Due to its rich chemistry and growth conditions, it comes not only in many different colors but also in unusual…
Market TrendsGem Focus June 2020: Kunzite: a rosy spodumene with an American name
Spodumene is almost exclusively a pegmatitic mineral of the pyroxene group that forms in monoclinic system with a chemical formula of LiAlSi2O6. Its hardness is 6.5 to 7 on the Mohs’ scale and displays perfect prismatic cleavage. Transparent and colored varieties show strong pleochroism. Strangely, the name spodumene means “ash-colored” in Greek referring to the dull and colorless examples when it was first named in the second half of the 19th century.
*Gem Focus & Market Pulse (Free Subscriber)Gem Focus May 2020: Engraved Gems
Engraved Gems. Timeless Seals and Canvases of Ancient Scenes.
*Gem Focus & Market Pulse (Free Subscriber)The Gemguide – Gem Market News – May/June 2020 Edition (All Articles)
Easy access to all articles from the The Gemguide May/June 2020 Edition.
Featured Articles