Newsletter Vol 5

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Newsletter Vol 5

DANAT CEO Visited Hongkong Fair 2017 Journey in to Greenland ; Rubies from Aappaluttoq DANAT visits Mozambique ruby deposits Investing in our trainee gemmologists HRD Diamond Grading Course Natural pearls found in the Kingdom of Bahrain: Characteristic...

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Hassan JahramiDec 10Comments Disabled

Pearls & Gemstones: The facts and the fiction

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Pearls & Gemstones: The facts and the fiction

The Pigeon’s Blood Tale  The most exceptional type of ruby available is currently known as Pigeon’s Blood, this being a trade rather than scientific term. It applies to a ruby that is said to have no trace of blue or pink. Legend states that the...

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Hassan JahramiNov 16Comments Disabled

Why women love gemstones

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Why women love gemstones

Women have long had a love for gemstones. Elizabeth Taylor even wrote a book titled ‘My love affair with jewelry’, which was warranted given her $4.2m dollar ruby, her 69.42-carat pear-shaped diamond and her legendary La Peregrina pearl, itself once...

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Hassan JahramiNov 16Comments Disabled

Bahrain and its pearling history

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Bahrain and its pearling history

With over 4000 years of pearling history behind the Kingdom, the pearl fisheries of Tylos (the ancient name for Bahrain) have been well documented throughout history including by the renowned Roman author, naturalist and philosopher, Pliny. The Kingdom’s...

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Hassan JahramiNov 16Comments Disabled

Black Non-Nacreous Natural Pearls from Pteria sp.

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Research Papers

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). Viewed with the microscope,...

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Hassan JahramiNov 15Comments Disabled

Natural Pearls from Australian Pincada Maxima

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Research Papers

Natural Pearls from Australian Pincada Maxima

The fascinating and colorful history of natural pearling in Australian waters is presented, from the earlysix-man luggers to the large ships in modern fleets where pearl culture has been the focus for the past several decades. For the scientific investigation...

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Hassan JahramiNov 15Comments Disabled

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

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Research Papers

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. This practice involves the placing...

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Hassan JahramiNov 15Comments Disabled