AuctionsSep 09, 2025
‘The Mellon Blue’ to Return to Auction, This Time at Christie’s The 9.51-carat fancy vivid blue diamond, which set two world auction records at Sotheby’s in 2014, is estimated to fetch up to $30 million.
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Beyond Borders: Crucial Factors in Colored Stone Origin Determination
Navigate origin determination with Continuing Education seminars offered by the GIA Alumni Collective™.
Brought To You By GIA Alumni Collective™
The value of high-end colored stones can increase dramatically depending on their origins, making 'country of origin' a critical value factor, alongside stone quality factors such as color, size, and shape. What does it take to make accurate, authoritative origin determinations?
Comprehensive Sample Collections
GIA’s field gemologists travel the world investigating mines and collecting samples for GIA’s unrivalled gemstone reference collection. With 26,002 colored gemstone samples and counting, including corundum, emeralds, spinels, alexandrites, and more, GIA’s reference collection only continues to grow. These gems are meticulously documented and researched. As databases expand and more information is gathered, previously held beliefs about geographic origin criteria may shift. For instance, the assumption that orange fluorescence in blue sapphires solely indicated a Sri Lankan origin was debunked when GIA researchers uncovered its presence in multiple low-iron metamorphic deposits.
Advanced Scientific Instruments
Advanced instruments are imperative for laboratories that issue geographic origin reports. As these instruments become increasingly sophisticated, more expertise is required to operate them. This is especially true for certain chemical analysis techniques, such as laser ablation. The cost of such equipment may be prohibitive for smaller labs, but GIA labs utilize the most premium microscopes and spectroscopy instruments to ensure accurate determinations.
Geography Versus Geology
Interesting fact: Did you know that gem deposits are determined by geology, not geography? Country boundaries don't affect where gems form, and gemstones from different deposits may possess similar properties. For example, some blue sapphires from Myanmar are practically indistinguishable from those originating in Sri Lanka. Understanding these technicalities is vital for accurate gemstone assessments.
Continued Education Opportunities with GIA Alumni Collective
The GIA Alumni Collective's Country of Origin seminars covering ruby, sapphire, and emerald offer professionals the chance to learn from field researchers dedicated to these studies. The seminars introduce topics like global colored stone deposits, advanced analysis techniques, and origin reference collection building. Interactive sessions, live demonstrations, and digital reference materials provide an engaging and comprehensive learning experience, including fascinating case studies.
Understanding the complexities of country of origin determination is a challenging yet crucial aspect of the gemstone trade. By participating in these comprehensive seminars, attendees can gain critical insights into the value and provenance of gemstones to make more informed decisions in this rapidly-evolving industry.
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