JTR’s diamond and jewellery grading institute blends traditional grading processes with the latest proprietary technologies — so every diamond and jewel is documented with clarity, transparency and trust.
Independent grading for finished jewellery — from a single solitaire to pieces set with many small stones.
Expert grading for jewellery with natural diamonds, using advanced analysis to document characteristics and confirm authenticity.
View reportConfirms the natural origin of diamonds in jewellery, while also documenting metal details such as gold, platinum and weight.
View reportSpecialised grading for jewellery with lab-grown diamonds — applying advanced techniques to distinguish origin and document characteristics.
View reportFull identification and 4C grading of loose diamonds and coloured gemstones, backed by advanced instrumentation.
Identification of natural diamonds, documenting their defining characteristics and confirming authenticity with advanced instrumentation.
View reportPrecise identification of lab-grown diamonds, confirming origin and documenting characteristics with advanced detection technologies.
View report
Comprehensive identification of coloured gemstones, detailing their unique characteristics with advanced instrumentation and expert analysis.
View reportImprove your workflow with ease of mind — let JTR handle screening, sorting and visualisation so you can focus on production.
Distinguishes natural diamonds from lab-grown diamonds in your inventory, providing clear results with confidence.
Professional sorting of your diamond inventory according to your specifications, so you can focus on production with confidence.
Interactive 3D visualisation of your diamond or gemstone. Examine every facet from any angle with unmatched clarity.
Per-item rates for all grading reports and diamond services, with trade and volume pricing on request. Jump straight to the list for what you need.
A JTR innovation that carries the report on the jewellery itself. The Tag pairs every essential detail from the grading record with two built-in security layers — so proof of authenticity travels with the piece.
Carat, colour, clarity, weight, metal, brand and product ID — the record's key data on a compact tag.
An iridescent hologram strip that responds to light and cannot be copied — the Tag's first anti-counterfeit layer.
Scan the QR code to confirm the Tag against JTR servers and open the full digital record.
JTR laboratories operate under ISO/IEC 17025 and are recognised through the world’s leading accreditation bodies — guaranteeing that every JTR report is trusted worldwide.
Learn moreConfirm its authenticity and view the full grading record in seconds.
Verify a report ↗Each JTR Tag combines the report's grading data with two anti-counterfeit security features. Here's what every zone means.
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The JTR mark identifies the Tag as an authentic, lab-issued record.
Your brand name, product ID and a scannable barcode tie the Tag to your inventory.
An iridescent hologram that responds to light and cannot be duplicated — the first anti-counterfeit layer.
A unique number matching the piece's full digital grading record.
Scan to verify authenticity against JTR servers and open the complete report — the second security layer.
The essentials at a glance: carat, colour and clarity, total weight and metal purity.