DiamondBuzz
GIA Puzzled by Rare Starburst Inclusions in Yellow Diamond
A 2.50-carat yellow diamond shows never-before-seen starburst cloud formations, prompting deeper investigation by GIA scientists.
The Gemological Institute of America (GIA) recently encountered an exceptionally unusual diamond that defied easy explanation. The 2.50-carat round brilliant, graded at the institute’s Carlsbad, California, laboratory, displayed star-shaped inclusions so distinctive that researchers struggled to pinpoint their origin.
According to research “several randomly distributed yellow zones consisting of stacks of clouds with four-sided star patterns near the girdle noticed in the diamond.” These clouds—clusters of micro-inclusions—each contained a central concentration of more intensely colored particles arranged in a cross-like formation. When viewed from an alternate angle, the phenomenon appeared as a row of bright-yellow overlapping triangles, prompting the GIA to launch an in-depth analysis.
Initial observations revealed blue fluorescence under long-wave UV light, while the clouded yellow patches displayed weak yellow fluorescence under deep-UV imaging. Testing also indicated the presence of hydrogen-related defects, typically associated with brownish or greenish color components. However, these did not explain the intense yellow coloration of the zones, which is more commonly linked to cape defects, H3 centers, isolated nitrogen (C-centers), or a 480-nanometer absorption band.
To probe further, GIA scientists used photoluminescence spectroscopy to compare the yellow zones with surrounding areas. The results showed no signs of H3-related features or absorption-band activity. The only notable finding was a nitrogen-vacancy center present exclusively within the vivid yellow areas, suggesting the coloration stemmed from C-centers confined to specific surface regions.
The lab initially considered whether the diamond might resemble a case reported in 2020, in which a near-colorless diamond developed a yellow overgrowth layer late in formation. However, the composition and behavior of the current stone’s micro-inclusion clouds did not align with that scenario.
GIA researchers concluded that the origin and formation of the starburst-like micro-inclusions remain unknown — a mystery that will require further investigation.
DiamondBuzz
Botswana Looks Beyond Rough Diamond Sales, Eyes U.S. Jewelry Market
The Duty Exemption By US Presents An Opportunity For Domestic Jewelry Manufacturers In Gaborone To Bypass Traditional Middle-Market Hubs and Establish A Direct Pipeline To American Consumers
Grappling with a painful downturn in global rough-diamond demand, Botswana is pivoting its economic strategy: expanding up the supply chain directly into American retail shelves while leveraging its resource wealth to fund conservation and diversification.
Speaking on the sidelines of New York Climate Week, Bogolo Joy Kenewendo, Botswana’s Minister of Minerals and Energy, highlighted the southern African nation’s plan to capitalize on a 0% import-tariff rate to the U.S. market. The duty exemption presents an opportunity for domestic jewelry manufacturers in Gaborone to bypass traditional middle-market hubs and establish a direct pipeline to American consumers.
shift The push into value-added manufacturing comes as the world’s top diamond producer by value navigates a broader structural Diamond revenues have long formed the bedrock of Botswana’s post-independence balance sheet, underwriting universal secondary education and tuition-free university funding. However, recent market volatility has underscored the vulnerabilities of a mono-sectoral economy.
Under the Botswana Economic Transformation Programme (BETP)—an initiative spearheaded directly by President Duma Boko and his vice president—the government is directing resources toward manufacturing, agriculture, and broader mining sectors to reduce its heavy reliance on rough diamond sales.
To support its luxury exports, Botswana is recalibrating its brand narrative around origin, environmental stewardship, and social impact. The country recently announced a five-year extension of the “Okavango Eternal” partnership alongside De Beers Group and the National Geographic Society. The initiative aims to protect the ecological integrity of the Okavango River Basin while tying diamond purchases to conservation efforts.
With De Beers currently facing an impending ownership change, officials remain optimistic that any capital restructuring could bring additional funds into Botswana to accelerate its domestic economic transition.
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