Certified Excellence
Every diamond comes with independent certification from world-renowned gemological laboratories, guaranteeing quality and authenticity.
Why Certification Matters
A diamond certification is an independent, professional assessment of a diamond's quality characteristics. It provides an unbiased evaluation of the 4Cs and serves as proof of your diamond's authenticity and value. At StoneBridge Jewelry, every diamond comes with certification from GIA or IGI, the industry's most trusted authorities.
Our Certification Partners
We work exclusively with the world's most respected gemological laboratories
GIA
Gemological Institute of America
The world's foremost authority in gemology, established in 1931. GIA created the 4Cs grading system and is known for its uncompromising standards.
IGI
International Gemological Institute
One of the largest independent gemological laboratories, founded in 1975. IGI is a leader in lab-grown diamond certification.
What's in a Certificate?
Understanding your diamond grading report
Detailed Analysis
Every diamond undergoes rigorous examination using advanced gemological equipment and techniques.
Comprehensive Report
Receive a detailed certificate documenting all aspects of your diamond's quality and characteristics.
Authenticity Guarantee
Each certificate includes security features and can be verified online for authenticity.
Laser Inscription
Certificate number microscopically inscribed on the diamond's girdle for permanent identification.
How Diamonds Are Certified
A rigorous multi-step process ensures accuracy and consistency
Initial Inspection
Diamond is received and logged into the laboratory system with a unique tracking number.
Grading Analysis
Expert gemologists evaluate the 4Cs using calibrated instruments and controlled lighting.
Quality Verification
Multiple gemologists independently verify the grading to ensure accuracy and consistency.
Report Generation
Comprehensive certificate is created with detailed specifications and security features.
Laser Inscription
Certificate number is inscribed on the diamond's girdle (optional but recommended).
Final Delivery
Diamond and certificate are returned with full documentation and online verification.
Benefits of Certification
Why every diamond should come with a certificate
Confidence in Quality
Independent verification ensures you're getting exactly what you pay for.
Investment Protection
Certified diamonds maintain their value and are easier to insure and resell.
Informed Decision
Detailed specifications help you compare diamonds and make the best choice.
Authenticity Proof
Certification confirms your diamond is natural or lab-grown as stated.
Sample Certificate
What to expect with your diamond certification