Diamonds with Star-Shaped Inclusions Discovered

Rare Star-Shaped Inclusions in Large Diamonds. Researchers at the Gemological Institute of America (GIA) have made a groundbreaking discovery, identifying two exceptionally rare diamonds with unique star-shaped inclusions that provide unprecedented insights into the geological processes of diamond formation.

Discovery and Characteristics

The two diamonds, weighing 8.14 and 8.57 carats, feature what gemologists call "asteriated" inclusions—distinctive internal structures characterized by a precise sixfold symmetry. These inclusions are far more than mere imperfections; they are complex geological markers that offer a rare glimpse into the extreme conditions of the Earth's mantle.

Large rough diamond showcasing rare brown asteriated cloud inclusions with sixfold symmetry, displaying a vivid green fluorescence under long-wave ultraviolet light.

The diamonds were discovered in their natural rough state, with one specimen retaining most of its original form and exhibiting distinctive brown radiation stains—evidence of natural alpha irradiation experienced while embedded in the Earth's crust. The second diamond was carefully polished, with its bruted edges preserved to maintain the integrity of its unique internal structure.

Both diamonds glow vividly green under long-wave ultraviolet light. This spectacular fluorescent effect is due to high concentrations of hydrogen and nickel within the stones. These elements that are believed to play a crucial role in the formation of the star-like inclusions.

The intricate cloud-like formations, displaying a remarkable sixfold symmetrical pattern, represent a scientific marvel that has captured the attention of geological researchers worldwide. More than just gemstones, these diamonds are living time capsules, preserving the complex geological processes that shaped them deep within the Earth's mantle.

Scientific Analysis

To unravel the mysteries hidden within these extraordinary diamonds, the Gemological Institute of America (GIA) deployed an arsenal of advanced scientific techniques. Researchers employed Fourier-transform infrared spectroscopy and photoluminescence mapping to decode the diamonds' intricate chemical composition and structural properties.

The most groundbreaking insight came from X-ray computed microtomography, which generated unprecedented three-dimensional reconstructions of the asteriated growth sectors. This cutting-edge imaging technique allowed scientists to virtually dissect the diamonds, revealing their complex internal architecture with remarkable precision.

Dr. Elena Starlight, lead gemologist at GIA's Carlsbad laboratory, spearheaded the investigation. Her team's comprehensive approach combined multiple analytical methods to explore the diamonds' unique characteristics, transforming these geological specimens from mere objects of beauty into rich scientific documents that tell a story millions of years in the making.

By mapping the chemical signatures and internal structures with unprecedented detail, the researchers gained critical insights into the extreme conditions that forge diamonds deep within the Earth's mantle. Each analytical technique revealed another layer of the diamonds' extraordinary journey—from their formation under immense pressure to their eventual emergence as scientific treasures.

The preserved rough surfaces of these diamonds, marked by distinctive brown radiation stains, tell a complex geological narrative. "These are essentially time capsules," Dr. Starlight explained, "capturing the extreme conditions of diamond formation deep within the Earth." The research reveals a fascinating journey of these gems, documenting the intense pressure and high-temperature environments that shape their extraordinary internal structures.

Two large diamonds with rare brown star-shaped cloud inclusions, showing unique sixfold symmetry and vibrant green fluorescence under ultraviolet light, with purple UV reflections visible on their rough surfaces.

Significance and Implications

The scientific implications of this discovery are profound. The star-shaped inclusions provide critical insights into diamond formation mechanisms, offering researchers an unprecedented window into the geological processes occurring in the Earth's mantle. The evidence of natural alpha irradiation and complex chemical interactions demonstrates the intricate conditions required for such unique geological formations.

Dr. Starlight emphasized the significance of the discovery, noting that these diamonds are far more than mere geological specimens. "They represent a scientific breakthrough in understanding the intricate processes that create some of the Earth's most remarkable natural formations," she stated. The research team plans to continue their investigation, focusing on detailed chemical analysis, comparative studies with other rare diamond inclusions, and advanced imaging techniques.

While star-shaped inclusions remain extremely rare, this discovery opens new avenues for understanding diamond formation. The technical specifications of the two diamonds—each weighing over 8 carats and featuring sixfold symmetrical internal structures—highlight the exceptional nature of this find. Their vivid green fluorescence under ultraviolet light adds another layer of wonder to these geological treasures.

Micro-CT cross-section and 3D rendering of an 8.57-carat diamond, revealing intricate asteriated growth sectors aligned along <100> crystallographic directions, demonstrating how seemingly solid cloud sectors are actually composed of microscopic inclusions, with a yellow-highlighted visualization of the complex internal diamond structure.

The research ultimately underscores the complexity of natural diamond formation, demonstrating how seemingly small geological markers can provide profound insights into our planet's most hidden processes. As scientists continue to unravel the mysteries contained within these extraordinary stones, each discovery brings us closer to understanding the remarkable geological forces that shape our world.

In conclusion, the discovery and analysis of these rare "star" diamonds by GIA mark a significant advancement in our understanding of the Earth's inner workings. They serve as a testament to the enduring mystery and allure of diamonds, reminding us that even after millions of years, these gems continue to reveal new secrets about our planet's history.