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GIA Studies Unusual ‘Mottled’ Pink Diamond Formed Through Multiple Treatments

Analysis reveals how HPHT, irradiation and heat transformed a brown diamond into a fancy pink stone with a rare visual pattern

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The Gemological Institute of America (GIA) has examined a rare pink diamond displaying an unusual mottled appearance, shedding light on how a combination of advanced treatments can influence both colour and visual texture.

The 1.10-carat round diamond, submitted to GIA’s New York laboratory, was graded as fancy deep brownish orangey pink. According to findings published in the fall issue of GIA’s Gems & Gemology journal, the stone stood out due to its patchy, mottled look—an uncommon feature in treated pink diamonds.

GIA’s analysis revealed that the diamond had undergone multiple enhancement processes, including High Pressure-High Temperature (HPHT) annealing, laboratory irradiation, and subsequent moderate heating. These treatments worked together to create nitrogen-vacancy (NV) centres within the stone, which are responsible for producing the pink colour. Prior to treatment, the diamond was originally brown.

Microscopic examination showed that the mottled pattern extended from shallow depths all the way to the polished surface. Further testing using visible and near-infrared (Vis-NIR) spectroscopy identified features consistent with irradiation and heat treatment.

GIA noted that the distinctive mottled appearance likely resulted from an uneven distribution of NV centres, influenced by the diamond’s nitrogen aggregates. While detailed mapping was not conducted to confirm this theory, the findings provide valuable insight into how complex treatment pathways can create unexpected visual effects in coloured diamonds.

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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

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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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JewelBuzz is Asia’s First Digital Jewellery Media & India’s No.1 B2B Jewellery Magazine, published by AM Media House. Since 2016, we’ve been the trusted source for jewellery news, market trends, trade insights, exhibitions, podcasts, and brand stories, connecting jewellers, retailers, and industry professionals worldwide.

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