Global Diamond Laboratory
ISO & International Gemological Accreditation • Mon – Fri: 10:00 – 19:00
Knowledge & Research
Stay informed with expert insights, scientific grading standards, market education, and practical care guides curated by our senior laboratory gemologists and research scientists.
Explore the universal standard established for evaluating diamond quality. Learn how each 'C' influences beauty, optical performance, and value.
Dr. Alistair Vance
Lead Gemologist & Head of Grading, GGDL
Browse by topic or search our gemological research archive.
Explore the universal standard established for evaluating diamond quality. Learn how each 'C' influences beauty, optical performance, and value.
Understand the chemical identity, crystal growth patterns (HPHT vs. CVD), and spectroscopic methods used by gemologists to distinguish natural and created stones.
A comprehensive guide to identifying the Big Three precious gemstones, recognizing common heat and clarity treatments, and understanding geographic origin determinations.
Keep your heirloom jewellery sparkling for generations. Expert tips on safe at-home cleaning, ultrasonic cleaner hazards, and storage best practices.
Does blue UV fluorescence make a diamond look milky or whiter? Learn what causes fluorescence, how laboratories grade it, and when it represents smart buying value.
Learn the crucial difference between store appraisals and third-party laboratory reports, and why independent certification is essential for security and resale value.
Submit your specimen to GGDL for precise, independent, and scientifically rigorous grading reports trusted by jewellers and collectors worldwide.
