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Inductively Coupled Plasma Mass Spectrometry (ICP-MS) trace mapping: titanium-iron ratios in sapphire?

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E
Elena Spectra•910 rep

What parts-per-million (ppm) trace element thresholds measured via LA-ICP-MS differentiate natural metamorphic corundum from treated synthetic material?

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5 Answers from travellers

✓Accepted Answer

Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) is the gold standard for advanced gemmological origin and treatment testing. By vaporizing a microscopic 35-micrometer crater on the girdle of a gemstone using an ultraviolet laser, vaporized ions are swept into a mass spectrometer to measure trace elemental concentrations down to sub-ppm levels. Evaluating titanium (Ti), iron (Fe), gallium (Ga), and magnesium (Mg) ratios constructs chemical discriminant diagrams that prove geographic origin (such as Sri Lanka vs Madagascar) and detect artificial diffusion treatments.

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D
Dr Kularatne Lab•1950 rep

The laser ablation pit is microscopic (smaller than a human hair diameter) and positioned discreetly on the unpolished girdle, preserving stone beauty.

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E
Elena Spectra•910 rep

High gallium-to-iron ratios (Ga/Fe > 0.02) serve as a chemical marker pointing toward metamorphic gem deposits in high-grade gneiss terrains like Sri Lanka.

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L
Lars Crust•915 rep

Detecting trace beryllium (Be) concentrations above 0.5 ppm confirms low-temperature lattice diffusion treatment in yellow and padparadscha sapphires.

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M
Max Rigging•925 rep

NGJA and international gem testing labs issue comprehensive trace-element profile reports alongside standard identification memos for high-value stones.

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C
Clara Gastronomy•885 rep

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