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Title:

The Miracle of Pearls

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The Miracle of Pearls A pearl start as a piece of dirt or grain of sand which enters the oyster. This piece of dirt or grain of sand then grows inside ... – PowerPoint PPT presentation

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Date added: 10 July 2020
Slides: 10
Provided by: evert
Learn more at: http://oysterproject.co.za
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Tags: miracle | pearl | pearls

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Title: The Miracle of Pearls


1
The Miracle of Pearls
2
  • A pearl start as a piece of dirt or grain of sand
    which enters the oyster. This piece of dirt or
    grain of sand then grows inside - protected by
    the oyster -
  • to a beautiful pearl.

3
The Formation of Pearls
  • Oysters are living creatures.
  • The grain of sand or piece of dirt enters the
    oyster while the oyster filters water over its
    gills for food.

4
  • The foreign object is then covered, slowly and
    layer by layer with nacre, a shell-like substance
    and in this manner the pearl is formed.
  • A normal size pearl takes many years to form in
    nature.

5
The Harvesting of Oysters and Pearls
  • Divers in Japan dive to great depths and hold
    their breaths for several minutes without
    equipment to harvest oysters at great peril to
    themselves.

6
Pearl in oyster
It is impossible to tell whether a pearl has
formed inside the oyster without harvesting and
opening the oyster.
7
  • Natural pearls are therefore very expensive.
  • Today, almost all pearls are cultured pearls.
  • Cultured pearls are formed in the same way as
    natural pearls but a core is placed in the
    oyster to start the pearl-forming-process.


8
Black Pearls
  • Natural pearls are mostly shades of white,
    although grey and black pearls are also found.
  • Grey and black pearls are
  • extremely rare in nature and
  • therefore very expensive.

9
  • Oysters therefore protect and nurture the
    object, a piece of dirt or grain of sand, to
    become a beautiful, priceless pearl.
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