01 · UNDERSTAND
I want to understand a diamond.
Know what it is, what matters and what remains uncertain—without having to interpret the evidence alone.
Understand a Diamond →DIAMONDMARK · Personalized Gemological Ecosystem
Know what matters.
Trusted gemological understanding, market context and continuing intelligence around the natural colour diamonds that matter to you.
ASK DIAMONDMARK
Private by default. Evidence and source status are shown where they matter.
Prototype visual study. Production should use rights-cleared macro photography of natural colour diamonds with museum-level restraint.
02 · DECIDE
I am considering an opportunity.
Examine the evidence, market context and questions that deserve attention before you act.
Review an Opportunity →03 · MANAGE
I want my important diamonds looked after.
Keep their information, documents, history and meaningful updates together in one private place.
See My Diamonds →WHAT MATTERS NOW
Selected intelligence. Not more information.
Diamondmark should surface only developments that help users understand a natural colour diamond, an opportunity, or the wider context around it.
Fancy colour diamond pricing remained broadly stable through Q2 2026.
FCRF reported a −0.1% quarterly movement in its Fancy Color Diamond Index. Diamondmark would interpret the category-level relevance rather than treat an aggregate index as the value of any individual diamond.
Open Source →Sotheby's Gem Drop September is live in New York.
The sale includes coloured diamonds among its jewels. Individual lots require stone-specific analysis before they become meaningful comparables.
Sotheby'sGIA continues research into natural-colour diamond classification and colour origin.
Diamondmark should translate scientific and laboratory evidence into client-relevant understanding without overstating what the evidence establishes.
GIAAuthoritative report data can be integrated directly into applications.
GIA's Report Results API supports coloured natural diamond reports and available report assets, enabling a reliable report-number doorway when approved access is in place.
GIANATURAL COLOUR DIAMOND MARKET
Current public context
Aggregate index movement is stable, but individual colour, intensity, size and stone-specific factors remain decisive. Diamondmark should always interpret the individual diamond.
−0.1%
FCDI Q2 2026
Quarter-on-quarter · FCRF
14–17
September
Sotheby's Gem Drop · New York
Live
GIA Research
Colour origin & classification resources
YOUR DIAMONDMARK
Useful because it understands what matters to you.
The interface stays calm. The relevance changes with the user, the diamond and the moment.
Everything important is in order.
One diamond needs attention.
MY DIAMOND
3.66 ct Fancy Vivid Pink
Provenance documentation remains incomplete. No other material change requires attention.
Review →My Diamonds6
Active Opportunities1
Need Attention1
Ask Diamondmark: What would you like to understand?ASK →
DIAMONDMARK INTELLIGENCE
Editorial intelligence with a professional purpose.
Research-journal discipline, museum-level presentation and decision relevance. Each publication should lead naturally back to the diamond or question the user is working on.
What a “Fancy Vivid” grade tells you—and what it does not.
A concise gemological explanation that separates laboratory description from market interpretation.
Open Brief →How to select meaningful comparables for a natural pink diamond.
Colour family, modifier, intensity, size, shape, clarity, provenance and transaction context all affect relevance.
Open Brief →What should remain with an important diamond through time?
Reports, images, provenance, ownership, insurance, expert review and material life events belong in one continuing record.
Open Brief →TRUST
Built around evidence. Designed around you.
Diamondmark should be useful precisely because it distinguishes established information from claims and interpretation—and knows when professional judgement is required.
01
Evidence
Important conclusions remain connected to their source, date, scope and status. Seller claims never silently become facts.
02
Privacy
Private by default. Users decide what to share, with whom, and for how long. Sensitive portfolio information stays separate from public intelligence.
03
Judgement
Technology supports the work. A gemologist becomes involved when physical examination, complex interpretation or consequential judgement matters.
MEMBERSHIP
Choose how Diamondmark works for you.
Begin with useful public intelligence. Personalize Diamondmark around your diamonds when it becomes valuable. Bring it into your organisation when the relationship grows.
START
Explore Diamondmark
For anyone beginning with natural colour diamonds and wanting reliable, useful understanding.
- Public ASK with sensible limits
- Market intelligence and selected reports
- Basic diamond snapshot
- Save selected interests
PERSONALIZED
Diamondmark Private
Keep your important natural colour diamonds understood, current and privately organised.
- My Diamonds and personalized ASK
- Private records and relevant updates
- Opportunity context and secure sharing
- Annual Diamondmark Review
- Priority professional support
ORGANISATION
Diamondmark Institution
One consistent standard for natural colour diamond intelligence across your organisation.
- Institutional workspace and multiple users
- Client / collection records
- Permissions and review workflows
- Secure client sharing and audit history
- Integrations / API where applicable
“When judgement matters, a gemologist should be available without making the client start again.”
PROFESSIONAL SUPPORT
The human layer remains part of Diamondmark.
Physical examination, complex provenance, important acquisitions, special research, major transfers and collection reviews can move naturally from Diamondmark intelligence into professional review while retaining the same context.
Ask a Gemological ExpertKNOWLEDGE FOUNDATION
HAYAGRIVA GEMOLOGICAL ACADEMY
Truth · Responsibility. HGA provides the quiet institutional foundation through research, education and preservation, while Diamondmark remains the specialized user-facing ecosystem for natural colour diamonds.
BEGIN WITH WHAT IS IN FRONT OF YOU
Have a natural colour diamond in mind?
Begin with the question, report or opportunity you already have.
Private by default · Evidence-led · Gemologist support when required