Nungu Diamonds at Griffin & Sloane
Nungu Diamonds is a South African diamond sourcing firm engaged by Griffin & Sloane where exceptional stones form an integral part of a bespoke commission.
Their role is defined by access, provenance, and discretion, ensuring that stones meet the same standards of integrity and judgement as the objects they become part of.
Stones as responsibility, not ornament
In high jewellery and fine watchmaking, stones introduce complexity as much as beauty. Provenance, cut history, ethical handling, and long-term stability matter more than immediate visual impact.
Nungu Diamonds exists to manage this responsibility. Their involvement ensures that when stones are specified, they are sourced, assessed, and selected with rigour rather than impulse.
Access, not inventory
Nungu does not operate a public catalogue. Stones are sourced in response to specific commissions, guided by design intent rather than availability.
Access extends across white diamonds, coloured diamonds, and selected coloured gemstones, with selection governed by suitability, proportion, and character. not trend or excess.
Nungu Diamonds operates within the De Beers sightholder system, providing access to primary-market diamonds under strict governance and traceability requirements. This allows sourcing decisions to be made upstream, with clarity around provenance, handling, and long-term accountability.
Provenance and discretion
Rooted in South Africa, Nungu’s sourcing emphasises traceability, ethical practice, and long-term accountability. Discretion is fundamental. Stones are never displayed publicly by default, and sourcing details remain private.
This approach aligns with Griffin & Sloane’s commitment to commissioning that is personal, considered, and unexposed.
Stones within a commission
At Griffin & Sloane, stones are considered only once intent is clear. Not every commission requires them, and many are stronger without.
Where stones are specified, Griffin & Sloane may work with Nungu to determine appropriate cutting and finishing. This allows proportion, symmetry, and optical behaviour to be aligned with the design intent of the commission, rather than constrained by pre-existing inventory.
Working with Nungu through Griffin & Sloane
All commissions involving Nungu Diamonds are governed by Griffin & Sloane. We define requirements, context, and integration before any sourcing begins, ensuring coherence across design, execution, and provenance.
This structure preserves discretion, integrity, and control throughout the process.