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Capiz Shell

Organic

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Capiz Shell Jewelry
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Table of Contents
  • General Information
  • Capiz Shell Colors
  • Alternate Names
  • Countries of Origin
  • Care

Capiz Shells come from the province of Capiz and the island of Samal in the Philippines. The shells are often called windowpane oysters because they have been harvested for thousands of years for use as windowpanes. Capiz shells are also used today in chandeliers, lampshades, decorative objects, clothing decoration and jewelry. The shells are translucent in their natural state and turn opaque when heated. When shells are heated for longer periods of time, they turn a smoky brown color. Shells are also dyed fashionable colors.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Capiz Shell
Species
Organic
Transparency
Opaque-Transparent
Refractive Index
1.530-1.685
Polariscope Reaction
Aggregate (AGG)
Toughness
Poor
Luster
Pearly, Greasy
Fracture
Uneven, splintery
Cleavage
None
Chemical Name
calcium carbonate, conchiolin and water
Chemical Formula
CaCO3 with H2O and other organic materials
Crystal System
NA
Chemistry Classification
Organic

Capiz Shell Colors

  • Bi-color Capiz Shell
    Bi-color
  • Black Capiz Shell
    Black
  • Blue Capiz Shell
    Blue
  • Brown Capiz Shell
    Brown
  • Gray Capiz Shell
    Gray
  • Green Capiz Shell
    Green
  • Multi-color Capiz Shell
    Multi-color
  • Orange Capiz Shell
    Orange
  • Pink Capiz Shell
    Pink
  • Purple Capiz Shell
    Purple
  • Red Capiz Shell
    Red
  • White Capiz Shell
    White
  • Yellow Capiz Shell
    Yellow

Alternate Names

Windowpane oyster

Countries of Origin

Unknown; Philippines

Care

Shell is very soft, so be mindful of scratching. Avoid sudden temperature changes, chemicals, and ultrasonic cleaners. In addition to above precautions: avoid perfumes, and hairsprays.

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