Difference between revisions of "Pearl, freshwater"
Jump to navigation
Jump to search
(username removed) |
m (Text replace - "== Authority ==" to "== Sources Checked for Data in Record ==") |
||
| Line 24: | Line 24: | ||
Grading chart for freshwater pearls: [http://www.purepearls.com/grading-freshwater-pearls.htm Pure Pearls] | Grading chart for freshwater pearls: [http://www.purepearls.com/grading-freshwater-pearls.htm Pure Pearls] | ||
| − | == | + | == Sources Checked for Data in Record == |
* 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 13:42, 1 May 2016
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
| Mohs Hardness | 3 - 4 |
|---|---|
| Density | 2.68 |
| Refractive Index | 1.57 |
Additional Information
Grading chart for freshwater pearls: Pure Pearls
Sources Checked for Data in Record
- Oppi Untracht, Jewelry Concepts and Technology, Doubleday & Co., Inc., New York City, 1985