Jewellery Examination & Mounted Stone Testing
In-situ non-destructive examination of mounted gemstones, diamonds, and metal hallmark documentation set in finished jewellery.
In-Situ Examination of Finished Jewellery
Unsetting gemstones from fine or antique jewellery can risk damaging delicate prongs, bezels, or the gemstones themselves. IGL provides specialized mounted gemstone examination services designed to test and document stones while remaining securely in their settings.
Using specialized long-working-distance micro-optics and mobile optical spectroscopes, our laboratory examines mounted rubies, sapphires, emeralds, diamonds, and pearls without unmounting.
What Mounted Examination Covers
- Main / Center Gemstone Identification
- Accent & Side Stone Screening (Natural vs Synthetic)
- Treatment Indicators (Heating, Oiling, Filling)
- Estimated Dimensions & Calculated Carat Weight
- Metal Hallmark Documentation & Photographic Capture
Mounted Testing Methodology
How IGL ensures accurate findings while respecting setting limitations.
High-Clearance Microscopy
Wide-field binocular microscopes with adjustable illumination allow inspection of pavilion facets beneath metal under-gallery wires.
Weight Estimation Formulae
Carat weight of mounted stones is calculated using standard gemological mathematical formulae based on exact leveridge gauge measurements.
Mounted Report Documentation
Reports state explicitly that examination was conducted in-situ, detailing setting style, stone count, and overall jewellery features.
Discover the IGL Difference
Professional Testing · Trusted Certification · A Brighter Tomorrow