Figure 6. Fluorescence spectra of bleached and optically brightened (red) and bleached and non-brightened (blue) akoya pearls. The non-brightened pearls show a broad fluorescence maximum at around 480 ...

One piece of jewelry customers can get here is blue Akoya pearls . These are cultured pearls that have a blue color so rich and deep that sparkling water seems to come out of the pearl's surface.

Unlike the more limited oyster species that produce South Sea or Tahitian pearls, Akoya pearls may grow in any Akoya species complex consisting of the Pinctada fucata, martensii, radiata, and ...

Also examined were nine tiny shell bead nuclei between 1.59 and 1.74 mm and weighing 0.30 carats total, as well as 67 loose akoya NBC pearls, ranging from 0.80 mm in diameter to 2.82 × 1.91 × 1.75 mm ...

Japanese pearl farmers reaped only 56.6 tons of akoya-grown pearls in 1996, down 22 percent from the 1993 harvest. Currently, production is just a quarter of what it was in 1995.

All processing of Akoya pearls —which originate in Nagasaki—is done in Kobe. Yellowing is removed to improve the natural shine, any blemishes are treated, and a final polish is given. Years of ...

What Makes South Sea Pearls So Unique South Sea pearls have several distinct characteristics that are unique to this gem. The nacre is unusually thick, ranging from 2 - 6 mm, compared to the 0.35 - ...

Akoya pearls are the classic round, white pearls. They were the first pearls ever to be farmed, and are a little bit smaller. A strand of Akoya pearls can cost from $300 to more than $10,000.

One of our pearl farms in Japan now represents more than 80% of the small-sized pearls in Japan; without our own pearl farms, we would not able to consistently produce some of our best-known designs ...