Figure 1. Left: 18K yellow gold “Flames” ring with 25.19 ct Mexican fire opal. Right: This 18K yellow gold “Spice” ring ...

The authors examine the gemological properties and commercial potential of a new source of amber, discovered in 2020 on the Vietnamese island of Phu Quoc. It is the only known amber locality in ...

At the AGTA show, the author spoke with Brent Smith, owner of Phoenix Gems (Holly, Michigan), who shared a few parcels of rough spinel of different colors recently mined in Malawi. According to Smith, ...

Many unusually large South Sea cultured pearls have been identified at GIA laboratories in the past (e.g., Fall 2013 Lab Notes, pp. 172–173; Summer 2023 Lab Notes, pp. 216–217). However, a recent ...

Whether you’re taking the next step in your professional journey or starting a new career, GIA courses and diploma programs prepare you for success. We offer the finest gem and jewelry education in ...

Designed for clients who seek in-depth insights into every aspect of a jewelry item. Comprehensive analysis of the diamonds in an item, including number of stones, shape, estimated carat weight, color ...

Aquamarine and heliodor are colored by Fe ions, an important coloring agent for beryl. Blue to yellow gem beryl was studied by quantitative spectroscopy and trace-element analytical techniques to ...

CARLSBAD, Calif. – June 2, 2025 – Beginning later this year, GIA (the Gemological Institute of America) will start using descriptive terms to characterize the quality of laboratory-grown diamonds and ...

Chemical vapor deposition (CVD) technology has been widely used to grow diamonds for the jewelry market, targeting popular colors and sizes. The majority of these products are colorless to ...

A remarkable large calcite recently seen at the GJX show displayed a dazzling array of colors resulting from both high dispersion and birefringence (C.S. Hurlbut and C.A. Francis, “An extraordinary ...

In the jewelry world, innovation continuously drives the industry forward, with jewelry designers often at the forefront of the creative attempt. The author found two bangles exemplifying this ...

At the 22nd Street show, Carter Stay, owner and artisan behind Keycap Quarry (Salt Lake City, Utah), shared his unique craft with the author, opening up about what led him to pursue an alternative use ...