After a slow start, the spring 2023 auction season ends with multiple broken records.
Read MoreJohn Woodmark provides an update on the Ponderosa sunstone mine in Oregon.
Read MoreAn impressive variety of natural, wild, nacreous, and non-nacreous pearls were on display at the GJX show.
Read MoreFran Mastoloni shares his thoughts on the status of the cultured pearl market.
Read MoreA successful spring season set high expectations for colored diamonds at auction in late 2022.
Read MoreDocuments Namak Mandi’s transformation from a salt market to one of Pakistan’s primary gem trading centers, with a look at the commercial activities taking place today.
Read MoreUsing customized, image-based measurement systems to quantify the effect of fluorescence on the color, brightness, and transparency of gem diamonds viewed in both face-up and table-down orientations.
Read MoreChronicles important auctions of jewels from European royal collections over the years, with a focus on a recent high-profile sale of items that once belonged to Marie Antoinette.
Read MoreThe geographic source of this rare color-change gem has a significant impact on value. Trace element chemistry profiles allow GIA to accurately determine origin for alexandrite from several countries.
Read MoreThe relative chemical diversity of emeralds from different deposits worldwide allows clear origin determination in most cases. This contribution explains the criteria used by GIA to make geographic origin conclusions for emeralds.
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