ALGT — Antwerp Laboratory for Gemstone TestingALGT — Antwerp Laboratory for Gemstone Testing
Research

Natural Bluish Green rough diamond

Natural Bluish Green rough diamond. Luckily with lots of radiation stains. Very difficult to judge from spectra alone ! If polished, color origin will often be undisclosed.

FTIR shows type IaAB (with H1a radiation damage), UV-Vis-NIR confirms this with 415 nm. Also clearly visible the radiation damage GR1 at 741nm.

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Fantastic cloud patterns in diamond from Zimbabwe

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Emerald in Colombia

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Recently a deep blue 0.71 carat sapphire (heated) was submitted to ALGT for origin report

Recently a deep blue 0.71 carat sapphire (heated) was submitted to ALGT for origin report

This amazing 3.03 cts and 3.15 cts demantoid pair originated from Russia was recently brought in ALGT for research.

This amazing 3.03 cts and 3.15 cts demantoid pair originated from Russia was recently brought in ALGT for research.

ALGT recently received strings of ruby beads purchased by a client at the Hong Kong Jewellery Fair.

ALGT recently received strings of ruby beads purchased by a client at the Hong Kong Jewellery Fair.

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