Difference between revisions of "Pearl, cultured"

From CAMEO
Jump to: navigation, search
Line 3: Line 3:
  
 
A pearl produced by inserting a bead into a pearl oyster. As early as the 13th century, Chinese were inducing the growth of freshwater pearls. A viable commercial process for culturing pearls was patented in 1896 by Kokichi Mikimoto in Japan. The process involves placing a [[mother-of-pearl|mother-of-pearl]] bead into the mantel of a live oyster. Over the period of a few years, the oyster covers the bead with several layers of [[nacre|nacre]]. This produces uniform, spherical pearls. The primary sources for cultured pearls are Japan and Australia with smaller producers found in China and Fiji. [[X-radiography|X-radiography]] is used to measure the thickness of the nacre layer and differentiate between natural and cultured pearls.
 
A pearl produced by inserting a bead into a pearl oyster. As early as the 13th century, Chinese were inducing the growth of freshwater pearls. A viable commercial process for culturing pearls was patented in 1896 by Kokichi Mikimoto in Japan. The process involves placing a [[mother-of-pearl|mother-of-pearl]] bead into the mantel of a live oyster. Over the period of a few years, the oyster covers the bead with several layers of [[nacre|nacre]]. This produces uniform, spherical pearls. The primary sources for cultured pearls are Japan and Australia with smaller producers found in China and Fiji. [[X-radiography|X-radiography]] is used to measure the thickness of the nacre layer and differentiate between natural and cultured pearls.
[[File:Branching comb.jpg|thumb|Cultured pearls]]
+
[[File:Branching Comb.jpg|thumb|Cultured pearls]]
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
  

Revision as of 14:02, 12 August 2020

Cultured pearls

Description

A pearl produced by inserting a bead into a pearl oyster. As early as the 13th century, Chinese were inducing the growth of freshwater pearls. A viable commercial process for culturing pearls was patented in 1896 by Kokichi Mikimoto in Japan. The process involves placing a Mother-of-pearl bead into the mantel of a live oyster. Over the period of a few years, the oyster covers the bead with several layers of Nacre. This produces uniform, spherical pearls. The primary sources for cultured pearls are Japan and Australia with smaller producers found in China and Fiji. X-radiography is used to measure the thickness of the nacre layer and differentiate between natural and cultured pearls.

File:Branching Comb.jpg
Cultured pearls

Synonyms and Related Terms

cultured pearl; seed pearls (less that 0.25 grains); perla cultivada (Esp.); perle de culture (Fr.); pérola de cultura (Port.)

Risks

Easily damaged by acids. Deteriorates at low humidities. Easily scratched. May be discolored by soap or skin oil.

Physical and Chemical Properties

  • Texture: slightly rough
  • Luster: pearly (iridescent)
  • Color: white, pale yellow, pink, gray, brown, black
  • Most exhibit a sky-blue color fluorescence
  • Mohs Hardness = 3 - 4
  • Density = 2.70-2.79

Resources and Citations

  • Oppi Untracht, Jewelry Concepts and Technology, Doubleday & Co., Inc., New York City, 1985

Retrieved from "http://cameo.mfa.org/index.php?title=Pearl,_cultured&oldid=78728"