Difference between revisions of "Pearl, freshwater"
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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 | ||
| − | + | == Physical and Chemical Properties == | |
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| − | == | + | * Mohs Hardness = 3 - 4 |
| + | * Density = 2.68 | ||
| + | * Refractive Index = 1.57 | ||
| − | + | == Resources and Citations == | |
| − | + | * 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 | ||
Revision as of 12:43, 12 August 2020
Description
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
- Grading chart for freshwater pearls: Pure Pearls
- Oppi Untracht, Jewelry Concepts and Technology, Doubleday & Co., Inc., New York City, 1985