Certification you can trust.
Every gemstone is individually documented, photographed, and sold as a singular piece.
Why certification matters
Certification is not a formality.
It is the foundation of trust.
The market reality
The global gemstone market includes highly respected laboratories — and a growing number of actors whose standards, methods, or independence are questionable.
For the untrained eye, certificates may appear similar. In reality, the differences are substantial.
At Vincentigue, certification is chosen deliberately, not conveniently.
Independent verification
Every laboratory report can be verified directly with the issuing laboratory.
Our choice for coloured gemstones: Guild Laboratories
After careful consideration, Vincentigue has selected Guild Laboratories as our primary certification partner for coloured gemstones.
Guild is known for:
- strict analytical standards
- transparent reporting
- conservative colour and treatment assessments
- independence from commercial trading
Why Guild fits our philosophy
Guild is recognised for analytical precision and conservative grading standards. Their reports focus on what a gemstone is — not how it could be marketed.
This aligns with our philosophy of restraint, precision, and long-term value.
Diamonds: GIA and IGI
For diamonds, Vincentigue works exclusively with GIA (Gemological Institute of America) and IGI (International Gemological Institute).
Both laboratories are internationally recognised and widely accepted within the fine jewellery and diamond trade.
GIA is regarded as the global benchmark for diamond grading.
IGI is used selectively, particularly for diamonds intended for contemporary jewellery contexts, where consistency and accessibility are essential.
What certification does — and does not — do
A certificate confirms: gemstone identity, natural origin where applicable, treatment status, and measurable characteristics such as weight, dimensions, and cut.
A certificate does not determine beauty, desirability, or future value on its own.
Those qualities are judged through experience.
One stone. One report.
Every gemstone offered by Vincentigue is accompanied by its own independent laboratory report.
No shared certificates. No assumptions. No substitutes.
Because transparency is not optional.