Sphalerite
Though its best-known source was the Aliva Mine in Spain, the mineral has been sourced in a handful of other places. But it isn’t often seen in jewelry due to a few specific characteristics.
Gem NotesThe Value of Attribution
Not every provenance may be marketable. Here’s what appraisers should know about provenance and how it affects value.
The Appraiser's NotebookMandarin Garnet
Traditionally named for the pure orange hues of spessartine garnet, mandarin garnet has been increasingly scarce for more than a decade, driving prices of large and fine goods upwards.
Market TrendsTrends and Market Highlights from a Colored Stone Update in Las Vegas
GemGuide rounds up interesting insights from three industry experts.
The Trade in FocusGem Focus – June 2024 – Featuring Chameleon Diamonds: fancy color diamonds with a temporary color change
These phenomenal stones show a color change when exposed to heat or taken out of the light.
*Gem Focus & Market Pulse (Free Subscriber)Las Vegas Jewelry Shows 2024: Buying, Trends, and the Gold Price
GemGuide reports on how the shows went and which jewelry styles and colors stood out.
The Trade in FocusSales and Foot Traffic Light at Recent GemGenève Trade Show
Worldwide turmoil meant buying was more cautious at the May event.
The Trade in FocusGemstone Source Region Update: Ethiopia
The country’s gemstone trade has been struggling after a multi-year armed conflict.
The Trade in FocusVideo Series: Exhibitors Talk About Their Tucson Bestsellers
A new series on GemGuide’s Instagram gets a pulse on market trends by asking five members of the trade one question.
The Trade in FocusStandard in the Making: A New Grading System for Turquoise
The Turquoise Grading System could standardize the process of evaluating the gem. It has undergone review and development and stands to bring a good addition to the trade.
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