Why Choose RARE.DIAMONDS
A fifth-generation diamantaire's commitment to extraordinary stones, scientific integrity, and the enduring relationships that define a life in diamonds.
Five Generations of Expertise
The Gavin family has been in diamonds since the 1880s, with Brian Gavin representing the fifth generation of diamantaires. This is not simply inherited knowledge — it is a living tradition of hands-on cutting, grading and trading refined across five lifetimes. The depth of understanding that comes from generational immersion cannot be replicated by credentials alone.
Uncompromising Standards
We acquire only a small fraction of the diamonds we evaluate. That selectivity is how we protect our clients: every stone that earns our recommendation has passed a level of scrutiny that most cannot, across color, purity, cut and documentation.
Scientific Verification
Every diamond we offer comes with a GIA report confirming it is natural and, for fancy colors, that the color is natural. On our most significant stones we also seek diamond type determination — we aim for Type IIa on important colorless diamonds, and natural blue diamonds are typically Type IIb. Because type alone does not prove natural origin, it is always read together with the laboratory report. Trust at this level must rest on verifiable evidence, not salesmanship.
Initial Screening
Review of the grading report, color grade and basic characteristics. Most stones are declined at this stage, before any are handled.
Hands-On Examination
Personal evaluation by Brian Gavin under controlled lighting — the judgment of a working cutter applied to every candidate stone.
Scientific Testing
Type verification where appropriate, advanced gemological analysis and authenticity confirmation through independent laboratories.
Cut Quality Assessment
Detailed analysis of proportions, symmetry and light performance — the discipline on which three U.S. patents were built.
Market Analysis
Research into comparable sales, auction results and current market positioning so that pricing rests on evidence.
Provenance Research
Investigation of history, previous ownership and any notable characteristics that add to a stone's story — the kind of history told in our Famous Diamonds series.
Long-Term Desirability
Assessment of the rarity, quality and collector demand that make a diamond one people will still seek in decades to come. Only after this complete evaluation does a diamond enter the RARE.DIAMONDS collection. Read our investment guide.
Global Network
Relationships built over decades with miners, master cutters and established dealers give us access to exceptional stones, often before they reach public markets. Many of our acquisitions are private sales — stones that are never publicly advertised and are offered only through trusted networks.
Transparent Pricing
We price against current auction results and dealer transaction data. We explain how a price was reached, including comparable sales and market analysis, so every acquisition decision is informed by real-world evidence rather than arbitrary markups.
Performance Cutting Expertise
Brian Gavin holds three U.S. patents for cutting designs aimed at light performance — in the round brilliant, emerald and cushion cuts. The same eye is applied to every stone we consider, and our cutting services put it to work for clients: cuts engineered for beauty, not maximum weight retention.
"In diamonds, there are no shortcuts to excellence. Every generation taught the next that your reputation is the only currency that truly appreciates."— Brian Gavin, Fifth-Generation Diamantaire
Lifetime Relationship
We remain available for future acquisitions, sales and upgrades long after the initial purchase. Many of our clients build collections over years, and we support their evolving objectives throughout. This is not a transaction — it is the beginning of a partnership.
Absolute Confidentiality
Complete discretion is assured for all client relationships and transactions. We understand the sensitive nature of significant acquisitions and operate with the same standard of privacy our clients expect from their most trusted advisors.
Education Over Pressure
We prioritize client education over sales pressure because informed collectors make better decisions — and better long-term clients. Our role is to ensure you understand exactly what you are acquiring, why it matters, and how it fits within the broader market before any commitment is made. Our education pages and FAQ are a good place to start.
Begin a Conversation
Whether you are acquiring your first significant diamond or adding to an established collection, we welcome the opportunity to understand your objectives.
Schedule a Private Consultation