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.
VBJ, Vummidi Bangaru Jewellers, one of South India’s most trusted heritage jewellery brands, partnered with IGNITION, the acclaimed thought leadership platform presented by the Shiv Nadar Foundation and curated by award-winning journalist Shoma Chaudhury. Held at ITC Grand Chola, Chennai, the event brought together distinguished voices from diplomacy, cinema and international affairs, while VBJ showcased its latest PARRO – Signature Collection, celebrating exceptional craftsmanship inspired by nature.
The evening featured compelling conversations with Dr. Abdul Majid Hakeem Ilahi, representative of Iran’s Supreme Leader, who shared perspectives on the evolving geopolitical landscape in West Asia; acclaimed actor Ali Fazal, who reflected on his artistic journey from Indian cinema to Hollywood; and former Foreign Secretary Vijay Gokhale, who discussed the changing global order and insights from his latest book, China’s Wars.
Adding an artistic dimension to the evening, VBJ unveiled a curated display of its PARRO – THE SIGNATURE PARROT COLLECTION, an exclusive line inspired by the grace, vibrancy and symbolism of the parrot. Combining intricate craftsmanship with contemporary design sensibilities, the collection reflects VBJ’s enduring commitment to transforming nature into timeless wearable art.
Speaking on the occasion, Amarendran Vummidi, Managing Partner, VBJ, said:
“IGNITION has established itself as a platform where influential voices come together to spark conversations that shape perspectives. At VBJ, we believe that meaningful ideas and enduring craftsmanship both have the power to inspire generations. Our continued association with IGNITION reflects our commitment to supporting platforms that celebrate excellence, dialogue and creativity.”
Jithendra Vummidi, Managing Partner, VBJ, added:
“The PARRO collection embodies our pursuit of artistry that is rooted in heritage yet resonates with contemporary lifestyles. Presenting it at IGNITION, a forum that celebrates ideas, innovation and culture, is a fitting way to showcase how timeless craftsmanship continues to evolve while staying true to its origins.”
As a fifth-generation family-run brand, VBJ takes immense pride in its legacy as the creator of the historic Sengol (sceptre) – a sacred symbol of India’s democratic journey. Rediscovered after 72 years through meticulous research by the VBJ team, the Sengol was reinstated beside the Speaker’s chair in India’s new Parliament building, Sansad Bhavan, by Hon’ble Prime Minister Narendra Modi, marking VBJ’s enduring bond with India’s cultural and national heritage. Continuing this legacy, VBJ is now set to unveil its largest jewellery showroom on Coimbatore’s 100ft Road.
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