Difference between revisions of "Pearl, freshwater"

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m (Text replace - "== Authority ==" to "== Sources Checked for Data in Record ==")
 
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[[File:2006.101-SC176994.jpg|thumb|'''MFA Acc. #:''' 2006.101]]
 
[[File:2006.101-SC176994.jpg|thumb|'''MFA Acc. #:''' 2006.101]]
 
== Description ==
 
== Description ==
 
+
[[File:Marsh-bird brooch.jpg|thumb|Marsh-bird brooch<br>MFA# 2007.827]]
 
Pearls obtained from mussels in freshwater lakes and rivers around the world. Freshwater pearls are cultivated in Lake Biwa (Biwa Pearls) in southern Japan and in China (China Pearls, Rice Pearls). Freshwater pearls have irregular shapes and come in a variety of nonwhite colors. They are often dyed. The surface of Rice pearls is generally rough and the surface of Biwa pearls is usually smooth.
 
Pearls obtained from mussels in freshwater lakes and rivers around the world. Freshwater pearls are cultivated in Lake Biwa (Biwa Pearls) in southern Japan and in China (China Pearls, Rice Pearls). Freshwater pearls have irregular shapes and come in a variety of nonwhite colors. They are often dyed. The surface of Rice pearls is generally rough and the surface of Biwa pearls is usually smooth.
  
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freshwater pearl; fresh-water pearl; Biwa Pearls; China Pearls; Rice Pearls
 
freshwater pearl; fresh-water pearl; Biwa Pearls; China Pearls; Rice Pearls
  
{| class="wikitable"
+
== Physical and Chemical Properties ==
|-
 
! scope="row"| Mohs Hardness
 
| 3 - 4
 
|-
 
! scope="row"| Density
 
| 2.68
 
|-
 
! scope="row"| Refractive Index
 
| 1.57
 
|}
 
  
== Additional Information ==
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* Mohs Hardness = 3 - 4
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* Density = 2.68
 +
* Refractive Index = 1.57
  
Grading chart for freshwater pearls: [http://www.purepearls.com/grading-freshwater-pearls.htm Pure Pearls]
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== Resources and Citations ==
  
== Sources Checked for Data in Record ==
+
* Grading chart for freshwater pearls: [http://www.purepearls.com/grading-freshwater-pearls.htm Pure Pearls]
  
 
* Oppi Untracht, ''Jewelry Concepts and Technology'', Doubleday & Co., Inc., New York City, 1985
 
* Oppi Untracht, ''Jewelry Concepts and Technology'', Doubleday & Co., Inc., New York City, 1985

Latest revision as of 13:43, 12 August 2020

MFA Acc. #: 2006.101

Description

Marsh-bird brooch
MFA# 2007.827

Pearls obtained from mussels in freshwater lakes and rivers around the world. Freshwater pearls are cultivated in Lake Biwa (Biwa Pearls) in southern Japan and in China (China Pearls, Rice Pearls). Freshwater pearls have irregular shapes and come in a variety of nonwhite colors. They are often dyed. The surface of Rice pearls is generally rough and the surface of Biwa pearls is usually smooth.

Synonyms and Related Terms

freshwater pearl; fresh-water pearl; Biwa Pearls; China Pearls; Rice Pearls

Physical and Chemical Properties

  • Mohs Hardness = 3 - 4
  • Density = 2.68
  • Refractive Index = 1.57

Resources and Citations

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