Inclusion profile
Broad black body color with small mineral concentrations near the pavilion; stable enough for a larger table. The cushion shape masks minor variations in inclusion distribution.
A large cushion-cut black diamond with enough softness for fine jewelry, but enough mass to remain an asset-class object. At this carat weight, the stone demands institutional documentation.
Acquisition level
From $24,200
Full gemological report and insurance valuation included.
Rarity index
92/100
Technical dossier
Stone specifications
- Carat
- 10.20 ct
- Dimensions
- 13.5 × 12.8 × 9.1 mm
- Cut
- Cushion modified brilliant
- Hardness
- 10 (Mohs)
- Surface luster
- Sub-adamantine, strong surface reflection
- Treatment
- None — natural color
Setting & mounting
- Setting
- Protective double claw setting
- Metal
- 18K yellow gold with platinum seat
- Origin
- Brazilian heritage stone
- Certification
- Full gemological report + insurance valuation
Gemological certificate
In-depth analysis
Light behavior
The cushion shape softens the black mass, producing broad pulses of reflected light rather than sharp flashes. In diffused light, the stone reads as a single, uniform void.
Provenance and certification
A documented Brazilian heritage stone with traceable acquisition chain. Recommended for clients who want a visible centerpiece with valuation support and private custody options.
Wearability profile
Best worn as a statement ring or convertible pendant because of its carat weight. The double claw setting protects the stone while allowing maximum surface exposure.
Care and handling
Store separately from white diamonds and sapphires to preserve metal finishing and stone edges. Professional cleaning every six months is recommended.
Investment note
Above ten carats, natural black diamond supply is extremely limited. This stone qualifies for institutional-level documentation and long-term holding strategies.
Curatorial analysis
The cushion keeps emotional warmth, which prevents a large black diamond from becoming visually harsh.
At more than ten carats, the stone needs a page that reads like a dossier, not a simple product card.
Gold accents echo the legacy site's luxury palette while giving the stone a ceremonial tone.
Acquisition notes
Insurance valuation advised
Private vaulting available
Lead time: 10–12 weeks
Origin
Brazilian heritage stone
Image referencePexels