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  1. #1
    Super Moderator Senior Pearl-Guide.com Pearl Expert jshepherd's Avatar
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    Default New Freshwater Pearl Coatings

    This is just out in G&G Briefs, written by GIA's Akira Hyatt.

    https://app.e2ma.net/app/view:Campai...edBeadCultured

    Unusual Coated Bead-Cultured Freshwater Pearls

    In September 2011, a strand of unusually large white baroque “pearls” was submitted to the New York laboratory for identification. The 17 pieces measured 22.43 x 17.60 x 14.17 mm to 29.46 x 19.64 x 16.50 mm. They had a noticeably unnatural color and surface appearance, but their baroque shape was typical of some freshwater cultured pearls seen in the marketplace ...

  2. #2
    Super Moderator Senior Pearl-Guide.com Pearl Expert Kevin Canning's Avatar
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    They really went for it with that coating, look how thick it is.


    The coating contained significant amounts of bismuth, which is often used to create a pearlescent appearance.
    Makes sense why they would use it as a coating when you see what Bismuth looks like:
    Kevin Canning
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  3. #3
    Pearl Enthusiast Senior Pearl-Guide.com Pearl Expert Pearl Dreams's Avatar
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    Dismaying. I wonder who is selling these?

    Edit: "Dismaying" if the buyer is left unaware of the coating, that is. If the buyer is informed, then it is just one more interesting way to market pearls.
    Last edited by Pearl Dreams; 12-06-2011 at 05:49 PM.

  4. #4
    Rare Pearl Senior Pearl-Guide.com Pearl Expert Caitlin's Avatar
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    OOh. I think that bismuth is pretty! Those oil slick colors...

    I'll keep an eye out for them at the tent shows this year. I doubt the main pearl sellers would go for this.
    Caitlin

    How to hand-knot pearls without a tool

    My avatar is a Sea of Cortez mabe pearl. One of a pair of Mexican handmade earrings.

  5. #5
    purveyor of pearls Senior Pearl-Guide.com Pearl Expert pearlescence's Avatar
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    When I see Bismouth in all that angular colourfulness I realise I've seen it used as a type of gem..isn't it also an indigestion remedy or am I thinking of something else?
    Something else to watch out for (the pearls I mean)

  6. #6
    Natural Pearl Expert Senior Pearl-Guide.com Pearl Expert Lagoon Island Pearls's Avatar
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    Quote Originally Posted by pearlescence View Post
    isn't it also an indigestion remedy or am I thinking of something else?
    It's used in antidiarrehal preparations. It puts the pink in PeptoBismol. It's also utilized as a lead substitute in both electronic and construction solder.
    Dave
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  7. #7
    Super Moderator Senior Pearl-Guide.com Pearl Expert Kevin Canning's Avatar
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    .isn't it also an indigestion remedy or am I thinking of something else
    Its the "bismol" part of pepto-bismol but It must be a different form of it not pure bismuth since its a heavy metal.
    Kevin Canning
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  8. #8
    Natural Pearl Expert Senior Pearl-Guide.com Pearl Expert Lagoon Island Pearls's Avatar
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    Quote Originally Posted by Kevin Canning View Post
    Its the "bismol" part of pepto-bismol but It must be a different form of it not pure bismuth since its a heavy metal.
    Yes. The salt derivatives such as bismuth subsalicylate are used in medicines while bismuth oxychloride is used in cosmetics. It has a low melting point thus crystals can be obtained easily without elaborate or costly means.
    Dave
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  9. #9
    Pearl Scholar Senior Pearl-Guide.com Pearl Expert pattye's Avatar
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    Hmm, wonder if that is the same as "mystic" coating being applied to so many inexpensive gemstones now, to give them some rainbow bling. Have seen often on druzy beads, many quartz, even sapphire.
    Pattye


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  10. #10
    purveyor of pearls Senior Pearl-Guide.com Pearl Expert pearlescence's Avatar
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    If it looks as pretty in my tum as in that picture no wonder my tum would feel better!

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