7.85 Ct 15x10x8 mm This exceptional petroleum-included Herkimer Diamond is a premium collector-grade specimenIs rare clarity and unique fluorescent properties make it a standout piece in any advanced mineral collection. The crystal commands attention with its sharply defined, gemmy body and a prominent upper termination that projects forward decisively, offset distinctly from the central axis. This off-axis geometry imparts a dynamic, sculptural presence—frozen in elegant motion—that elevates it far beyond standard symmetrical Herkimer examples from the classic New York locality. In natural or daylight conditions, the stone displays superb transparency and a brilliant vitreous luster. Facets are crisp and precise, allowing light to penetrate deeply and reveal subtle internal play. The upper apex remains razor-sharp and pristine, serving as the commanding focal point, while the overall habit balances structural integrity with exceptional optical clarity. Internally, a captivating world of ancient inclusions unfolds: delicate layered veils, fine growth phantoms, and scattered petroleum-filled cavities arrange in harmonious, flowing patterns. These features add profound depth and narrative—evidence of hydrocarbon entrapment under immense pressure millions of years ago—without detracting from the crystal's high clarity. The petroleum pockets appear as dark fluid inclusions in ambient light, poised to reveal their secret under UV. Under long-wave ultraviolet illumination, the specimen transforms dramatically into a glowing masterpiece. The interior ignites with intense, zoned fluorescence dominated by vivid electric blue tones, accented by rich violet undertones and intermittent emerald-green flashes that shift across internal planes with changes in angle. Bright white highlights flare against the saturated blues and violets, creating a layered, almost holographic three-dimensional effect that feels vibrantly alive. This clean, powerful, and chromatically diverse response is the hallmark of perfectly preserved petroleum inclusions—a rare and highly desirable trait that confirms authentic Herkimer County provenance. Unlike one-note fluorescent pieces, this example delivers an immersive, multispectral UV performance: blue-dominant yet nuanced, with spatial complexity that rewards close inspection and varying light angles. It bridges scientific mineralogy with aesthetic wonder, turning a natural quartz formation into a luminous geological artifact. Auction Specifications Origin: Herkimer County, New York, USA Mineral: Herkimer Diamond (quartz) Habit: Naturally double-terminated with dominant, forward-projecting upper termination Termination: Exceptionally acute upper apex significantly off-axis Transparency: High, with visible internal veils and petroleum inclusions Luster: Vitreous Fluorescence (long-wave UV): Strong, multicolored—electric blue dominant with violet, deep navy, and green accents Inclusions: Petroleum-bearing cavities, growth veils, natural phantoms Condition: 100% natural, untreated, unpolished—no enhancements Striking symmetrical geometry with bold, off-axis upper termination for sculptural impact Petroleum-driven fluorescence: intense electric blue glow with layered violet/green zoning and white highlights Exceptional preservation: pristine facets, sharp termination, no damage or repairs Authentic Herkimer provenance with classic petroleum-inclusion behavior Dual appeal: superb in daylight clarity + transformative UV drama Internal structures that enhance depth without clouding transparency Petroleum-bearing Herkimer Diamonds represent one of the most coveted variants from this iconic locality, prized by advanced collectors for their dramatic ultraviolet response and encapsulated prehistoric hydrocarbons. This piece stands out with elite termination aesthetics, sophisticated chromatic variety in fluorescence, and spatial richness—qualities that position it as true premium material rather than a standard fluorescent curiosity. Ideal for discerning bidders seeking a specimen that combines commanding external form, intricate internal geology, and a mesmerizing UV spectacle. Comparable high-end examples frequently achieve strong results in specialized mineral auctions due to their rarity and visual power. The crystal's maximum value lies in its untouched natural state. Any lapidary work would compromise the distinctive off-axis termination and disrupt the precise distribution of petroleum inclusions, diminishing its collector significance and fluorescent performance.