Diamond
Testing & Verification
Using advanced photoluminescence spectroscopy, thermal conductivity profiling, and microscopic analysis, we distinguish natural diamonds from laboratory-grown (CVD & HPHT) diamonds and detect simulants like Moissanite, Cubic Zirconia, and White Sapphire.
Laboratory Diagnostic Suite
While lab-grown diamonds share a chemical blueprint with natural stones, their crystal lattices retain distinct growth markers. Simulants differ entirely at the molecular level.
CVD & HPHT Detection
We use Photoluminescence (PL) spectroscopy to detect silicon-vacancies (CVD) or metallic fluxes (HPHT), and DiamondView imaging to trace geometric growth patterns and phosphorescence.
Moissanite Verification
Silicon Carbide conducts heat similarly to diamond. We isolate Moissanite by checking for double refraction (birefringence) under 10x-60x magnification and utilizing electrical conductivity.
Cubic Zirconia (CZ)
A heavy zirconium dioxide simulant. We detect Cubic Zirconia through specific gravity measurements (CZ has ~1.6x the density of diamond) and thermal resistance testing.
White Sapphire & Glass
Corundum and glass simulants lack diamond's high refractive index (RI 2.42) and dispersion. We identify them via refractometry (RI ~1.76 for Sapphire) and polariscope analysis.
Diamond & Simulant Verification Matrix
Technical properties compared to establish absolute diagnostic certainty during analysis.
| Material Type | Composition | Refractive Index (RI) | Thermal Conductivity | Key Distinguishing Laboratory Test |
|---|---|---|---|---|
| Natural Diamond | Carbon (C) | 2.42 (Singly Refractive) | Exceptional (~2000 W/m·K) | Natural nitrogen impurities (Type Ia/Ib), mineral inclusions, and irregular growth lines under magnification. |
| HPHT Synthetic Diamond | Carbon (C) | 2.42 (Singly Refractive) | Exceptional (~2000 W/m·K) | Metal flux inclusions (Ni, Fe, Co), strong phosphorescence, and cuboctahedral growth patterns under DiamondView. |
| CVD Synthetic Diamond | Carbon (C) | 2.42 (Singly Refractive) | Exceptional (~2000 W/m·K) | Silicon-vacancy (SiV-) defect line at 737nm detected by Photoluminescence, and tabular growth striations. |
| Moissanite (Mozinite) | Silicon Carbide (SiC) | 2.65 - 2.69 (Doubly Refractive) | High (~150 W/m·K) | Birefringence (displays facet doubling under 10x loupe), electrical conductivity, and high dispersion (intense rainbow fire). |
| Cubic Zirconia (CZ) | Zirconium Dioxide (ZrO₂) | 2.15 (Singly Refractive) | Very Low (Thermal Insulator) | High Specific Gravity (5.6 - 6.0, feels 1.6x heavier than diamond), immediate failure on standard thermal tester, lower hardness (8.5 Mohs). |
| White Sapphire | Aluminum Oxide (Al₂O₃) | 1.76 - 1.77 (Doubly Refractive) | Low | Much lower Refractive Index, lacks dispersion/fire (looks glassy), doubly refractive, and low thermal conductivity. |
Why Certification Matters
Investment Security
A laboratory-backed diamond report verifies identity and grades, protecting your capital value across all global diamond trading exchanges.
Laser-Inscribed Provenance
Tested diamonds receive a microscopic laser inscription on the girdle, linking the physical gemstone directly to its secure digital database registry.
Ethical Tracing
We strictly audit the supply chain of all submissions, ensuring diamonds certified by our laboratory are conflict-free and compliant with the Kimberley Process.
Begin Your Laboratory Analysis
Secure your diamond's legacy with the industry's most rigorous scientific verification. Appraisals and testing bookings available at our key global stations and Delhi headquarters.
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