Zincite
To complicate matters, zincite can be and has been intentionally synthesized in a laboratory. Many years ago, synthetic zincite was used as semi-conductor crystal detectors in radios before the advent of vacuum tubes.
Gem NotesSecret Valuation Service
After months of intense work, under the burden of a top-secret clearance, a cryptanalyst 1 breaks an encryption. However, based on the maximum of “the need-to-know,” he is not allowed to read any intercepted secret…
The Appraiser's NotebookGem Focus April 2022: Peridot; an ancient stone aptly named after olives as a mineral.
Peridot is a yellowish green to green gemstone belonging to the olivine mineral group. It has been known for thousands of years.
*Gem Focus & Market Pulse (Free Subscriber)Gem Focus March 2022: Alexandrite; emerald by day and ruby by night…
Alexandrite is the variety of chrysoberyl that exhibits a change of color from blue-green hues in day light into purple-red hues in incandescent light. It is arguably one of the rarest of all gemstones.
*Gem Focus & Market Pulse (Free Subscriber)Tucson Color Report
During interviews conducted the week after the AGTA and GJX shows closed, many dealers expressed their satisfaction with the strength of business conducted in Tucson. “It was a very good show, one of the best in years”
Featured ArticlesStrong Demand = Price Increases
What a great start to the year for the diamond industry. Demand is strong and prices are climbing. Tucson was good for color but even good for those that sold diamonds, being a “non-diamond” gem show.
Diamond MarketSome Interesting Finds in Tucson
Blue chalcedony is not a gem that the GemGuide normally researches, but in Tucson was a dealer selling Ethiopian blue chalcedony that was of the finest we have seen.
Gem NotesThe Trade of Appraising
The ideal stability on the appraisal teeter totter would be to have a professional valuator on each side or having both ends worked by trade appraisers. Here one can expect consistency in valuation approach.
The Appraiser's NotebookColor Filters: Useful Tools that Gemologists Should Use But Often Don’t
All qualified gemologists will have encountered color filters. This ‘encountering’ may take place during their gemological studies and might be as far as they get. They are losing attention and though there are obstacles, we should return to their teaching.
Gem TestingConstantin Wild: Gems, Colors & Wild Stories
This is a unique book in the way it was produced and laid out. The last book that I reviewed for the GemGuide was on the collection of gems and jewelry of the Smitsonian Museum in the USA. This is a perfect followup
Book Review