Announcement

Collapse
No announcement yet.

Species with Hinged Teeth

Collapse
X
Collapse
  •  

  • Pinctada radiata

    Distinguishing Characteristics

    Pinctada radiata is most notorious as one of the greatest sources of natural pearls. Historically, P.radiata pearls from the Ceylon region constituted the majority of pearls available. This particular variety has almost entirely white nacre that produces predominantly silver and yellow pearls. The lip of the pale yellow shells is slightly pinkish. Seven-eight brownish radial bands encircle the shell. The Persian variety is larger and darker with a reddish lip.

    Habitat and Ecology

    P. radiata is characteristic of hard surfaces and has been discovered attached to rocks and hard sandy plateaus, 10-20 meters deep. The oysters attach in clusters of several to many through byssal threads (tough organic fibers created by the oysters). Over years assemblages form consisting of dead pearl oyster shells, worm tubes, calcareous algal clumps and dead coral. These structures act as a landing dock for the veligers (free-swimming larvae) to metamorphose into juvenile pearl oysters that will maintain the reproductive cycle. Storms and predators are major threats to the continued health of this thriving habitat.

    The Pearls of Pinctada radiata

    Pinctada radiata is mostly known for producing seed pearls and some medium sized pearls. A seed pearl is a commercial term describing a pearl less than 2mm in diameter (<.25 grain). Due to the thinness of their shells, P. radiata provides the cheapest Mother of Pearl. Until the 1920's, P. radiata (mainly those from the Ceylon region of Sri Lanka) fueled the world's demand for both Mother of Pearl and pearls.
    The Ceylon oyster is Akoya-like, but is not used in pearl culture in the way that Akoya pearl oysters are. This is due to a few factors:
    • Since the 1930's, Petroleum dominates the economics of countries in the Persian Gulf and Red Sea, which account for the bulk of the P. radiata shells. The discovery of oil in the 1930's ended pearl harvesting and diving is only a pastime.
    • Bahrain, Sri Lanka and India have each tried to develop a cultured pearl industry, but tradition favors natural pearls
    • Through years of aquaculture, the Japanese have created farms of the fittest Akoya oysters in order to culture favorable pearls: large, round, lustrous and milky white.
    Pearls from P.radiata were historically used for decoration and in jewelry. Most of the pearls were exported from Bahrein and then shipped to London. The shells were assigned symbolic meaning and some have been recovered from ancient tombs of the Hellenistic-Roman period.

    Originally thought to be P. radiata, P. anomioides is now designated a separate species.

    Related Articles:
    Last edited by CortezPearls; 03-15-2021, 11:04 PM.
      Posting comments is disabled.

    Categories

    Collapse

    article_tags

    Collapse

    Latest Articles

    Collapse

    • A review: The History of Pearls in the Gulf of California, Mexico Part 3
      by CortezPearls
      THE FIRST COMMERCIAL PEARL OYSTER FARM IN THE WORLD

      It is at this particular crossroad that we find a Mexican-French Medical Doctor by the name of Gastón Vivès, attempting what very none had tried before: initiate a commercially viable, large-scale pearl oyster farm to produce shell and pearls. The Vivès family owned a pearl fishing armada in La Paz, Baja California Sur, and they were experiencing diminishing profits every year, thus wanting to revert this trend we find Gastón Vivès...
      05-08-2021, 05:20 PM
    • A review: The History of Pearls in the Gulf of California, Mexico PART 2
      by CortezPearls
      The arrival of the Iberian Conquerors

      The Native Nations had no real interest in establishing a commercial venture in pearl fishing and we understand little to nothing of the way they fished for pearls, since most of the information was either lost or destroyed during the conquest of Mexico. The rich plunder of the Conquistadores was sent to Spain and later dispersed all over Europe. The most significant information we have on the subject comes from the period of colonization of northwestern...
      04-05-2021, 03:26 PM
    • A review: The History of Pearls in the Gulf of California, Mexico - PART 1
      by CortezPearls
      A review: The History of Pearls in the Gulf of California, Mexico
      By Douglas McLaurin-Moreno


      Since unrecorded time, man has obtained many bounties from the world’s oceans: food, shells, corals, sponges, seaweeds, and the most desirable of all of these were the beautiful mother-pf-pearl shells and their valuable treasure, Pearls.

      Mexico has four species of pearl oysters inhabiting its coasts, two -the larger sized- on the Pacific side: the Panamic Black Lip...
      03-18-2021, 03:04 PM
    • About Pearl-Guide.com
      by Kevin Canning
      More than 10,000 Members Strong
      Founded in 2003 with the addition of a community forum in 2004, Pearl-Guide.com is a friendly group of pearl dealers, farmers, traders, wholesalers, hobbyists, authors, and consumers. With members from around the world engaged in daily conversation, Pearl-Guide.com is the largest community of pearl enthusiasts in the world.

      World's Only Open Pearl Discussion Forum Pearl-Guide.com exists for the benefit of consumers and the trade. With the world...
      07-24-2014, 07:33 PM
    • The French Blue
      by WayneCMS
      By Richard Wise I was fortunate enough to get an early Kindle edition of Richard Wise's newest masterpiece The French Blue. I also own a copy of Wise's Secrets of the Gem Trade, and it is one of the very few gem books that I've read cover to cover, not just skipping ahead to the sections about pearls. The French Blue is a completely different kind of work. It is a novel that begs to be read slowly, but once one becomes entranced in the story, it is nearly impossible to put down. Not for the f...
      07-21-2014, 10:36 AM
    • Pearl-Guide.com Forum Policies and Rules of Conduct
      by WayneCMS
      Pearl-Guide.com, its owners, moderators and administrators reserve the right to:
      • Remove or move any content for any reason at our sole discretion
      • Modify or edit any content for any reason at our sole discretion
      • Suspend or ban any members for any reason at our sole discretion
      Use of Pearl-Guide.com will constitute acceptance of the following policies and rules of conduct. These policies and rules of conduct may change periodically. The forum on Pearl-Guide.com is presented "as is" with no w...
      07-21-2014, 10:31 AM
    Working...
    X