Research Papers

Chemical Characteristics of Freshwater and Saltwater Natural and Cultured Pearls from Different Bivalves

DANAT research detailing the chemistry of more than 1000 samples from different molluscs was recently published. Samples from freshwater sources were found to contain more manganese and barium than their saltwater counterparts. On the other hand, samples...

adminJul 03Comments Disabled

REAL-TIME MICRORADIOGRAPHY OF PEARLS: A COMPARISON BETWEEN DETECTORS

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REAL-TIME MICRORADIOGRAPHY OF PEARLS: A COMPARISON BETWEEN DETECTORS

Over the past ten years, gemological laboratories have been replacing film-based microradiography with real-time X-ray microradiography (RTX). This paper compares the output quality and resolution provided by two RTX units fitted with different detectors:...

Hassan JahramiMar 15Comments Disabled

Black Non-Nacreous Natural Pearls from Pteria sp.

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Black Non-Nacreous Natural Pearls from Pteria sp.

The Bahrain Institute for Pearls & Gemstones (DANAT), Manama, recently received a 5.70 ct black pearl (9.49–9.51 ´ 8.75 mm) and an 11.84 ct black and brown pearl (13.63–13.71 ´ 9.55 mm), both of button shape (Figure 1).

Hassan JahramiMar 15Comments Disabled

Natural Pearls from Australian Pincada Maxima

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Natural Pearls from Australian Pincada Maxima

Hassan JahramiMar 15Comments Disabled

Experiments in using atypical ‘beads’ and mantle interference in the production of cultured pearls with Australian Pinctada maxima

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Experiments in using atypical ‘beads’ and mantle interference in the production of cultured pearls with Australian Pinctada maxima

Since approximately 2010 a practice has been developed of using low quality natural pearls as the substrates for cultured nacre growth – natural pearls used as ‘beads’ in the production of ‘bead’ cultured pearls.

Hassan JahramiMar 14Comments Disabled

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