Inclusion profile
Dense graphite concentration with stable microscopic hematite veining. No dominant surface-reaching fracture is visible across the table. The polycrystalline matrix remains intact under 10× magnification.
A sharply composed collector stone for clients who want the visual gravity of black carbon with the discipline of a modern gallery object. The radiant geometry keeps the stone visually alive without compromising the severe black silhouette.
Acquisition level
From $18,400
Stone-only pricing. Setting and finishing quoted separately.
Rarity index
88/100
Technical dossier
Stone specifications
- Carat
- 8.42 ct
- Dimensions
- 14.8 × 12.1 × 8.6 mm
- Cut
- Radiant modified brilliant
- Hardness
- 10 (Mohs)
- Surface luster
- Sub-adamantine to metallic
- Treatment
- None — natural color
Setting & mounting
- Setting
- Low architectural bezel
- Metal
- 18K white gold with black rhodium finish
- Origin
- Brazilian carbonado selection
- Certification
- GIA dossier + BlackDiamond provenance file
Gemological certificate
In-depth analysis
Light behavior
The stone does not try to sparkle like a white diamond. Its value is in controlled surface reflection: sharp, metallic, and nearly architectural. Under directional light the facets read as a geometric map of the stone's internal density.
Provenance and certification
Sourced from a carefully screened Brazilian carbonado parcel. Full gemological dossier available, including macro imagery, crystal structure analysis, and origin verification. Conflict-free and ethically extracted.
Wearability profile
The low bezel lowers impact risk and makes the piece appropriate for disciplined daily wear. The modified radiant cut distributes stress evenly across the setting, reducing chipping risk.
Care and handling
Avoid ultrasonic cleaning. Use a soft brush with warm water and mild soap. Professional inspection recommended after heavy wear. Store separately from other gemstones to prevent surface contact.
Investment note
Rarity index 88/100 places this stone in the upper collector tier. The carat weight above eight carats represents a significant supply threshold. Documentation supports private insurance valuation.
Curatorial analysis
The radiant geometry keeps the stone visually alive without compromising the severe black silhouette.
A low bezel makes the diamond read as a sculptural object rather than a sparkle-first jewel.
This is the closest evolution of the legacy catalog card: retail-ready, but with enough documentation to satisfy a serious collector.
Acquisition notes
Private appointment recommended
Stone-only or finished ring
Lead time: 6–8 weeks
Origin
Brazilian carbonado selection
Image referencePexels