DiamondBuzz
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
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.
DiamondBuzz
Divine Solitaires Reinforces The Value Of Diamonds Amid Rising Gold Prices and Evolving Consumer Sentiment
Divine Solitaires Shares Its Perspective On Why Natural Diamonds Remain A Timeless and Relevant Choice For Modern Buyers.
Amid recent debates about rising gold prices and changing consumer purchasing habits, Divine Solitaires has provided a timely brand viewpoint pushing customers to reconsider how they approach milestone and aspirational purchases. Drawing on the greater economic conversation about reduced gold dependency and smarter purchasing choices, the brand has proposed a simple but relevant idea: halting gold purchases does not have to imply pausing personal celebrations or dreams.

Built around the message, “A Golden Pause. A Diamond Moment.”, the brand’s latest communication reflects the current market reality, where consumers are becoming more mindful of gold purchases amid unprecedented bullion price hikes and evolving government measures impacting the gold sector. Divine Solitaires believes this moment presents an opportunity for buyers to shift their focus toward natural diamonds, which continue to hold emotional, symbolic, and long-term value for milestone moments.
The idea also stems from a broader industry and economic perspective. While more than 90% of the gold consumed in India is imported, India’s natural diamond ecosystem remains deeply connected to the country’s economy, with Indian artisans cutting and polishing over 90% of the world’s diamonds, most of which are exported globally. Divine Solitaires highlights how choosing natural diamonds not only celebrates emotional and milestone moments, but also supports Indian craftsmanship, employment, foreign exchange generation, and the country’s global leadership in the diamond industry.

Additionally, the brand positions solitaire diamond coins as meaningful modern purchases that can serve as a thoughtful alternative to traditional gold coins. While gold coins often offer limited value addition to the Indian economy due to high import dependency, natural diamonds contribute significantly to India’s craftsmanship, exports, employment, and global industry leadership combining emotional value with lasting economic impact.
Commenting on this perspective, Jignesh Mehta, Founder and MD, Divine Solitaires, said:

“Jewellery has always been deeply emotional, whether it marks love, achievement, commitment, or self-reward. At Divine Solitaires, we looked at the current gold price scenario and felt there was a larger, more relevant consumer conversation to participate in. If buyers are consciously holding back on gold due to current market conditions, it doesn’t mean their celebrations or aspirations should be put on hold.”
He further added,”Natural diamonds offer timeless emotional value and remain deeply aspirational. At the same time, they are part of an industry where India has built extraordinary global leadership through its craftsmanship and processing expertise. This is our way of encouraging consumers to think differently, thoughtfully, and meaningfully in the current environment.”
With this, Divine Solitaires maintains its position as a brand that goes beyond product-driven conversations, engaging with real customer sentiment and bigger societal developments while underlining natural diamonds’ enduring value.
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