Precious and Decorative Stones

2020: No. 4 (102) CONTENTS

DOI: https://doi.org/10.53056/2020-4(102)-1

NON-NACREOUS PEARLS

О.Belichenko
State Gemmological Centre of Ukraine

Language: Ukrainian

Precious and Decorative Stones. No. 4 (102), 2020: 4–8

Abstract
The up-to-date information about the types of non-nacreous pearls that are used in jewelry is systemized: Conch, Clam, Melo, Scallop, Quahog and Pen pearls. Their specific features are described, the information about pearl-producing mollusks as well as regions of their distribution are given.

Keywords: non-nacreous pearls, Conch, Clam, Melo, Scallop, Quahog, Pen pearls.

References

1. Conch Pearl: The Only Natural Pink Pearl. URL: http://www.geologyin.com/2018/02/conch-pearl-only-natural-pink-pearl.html (date of appeal: 21.12.2020).
2. CIBJO. The Pearl Book. CIBJO standart. 2020-1. 2020-04-01. 79 ð.
3. Kamat S. et al., Structural basis for the fracture toughness of the shell of the conch. Strombus gigas. Nature. Vol. 405. No. 6790. 2000. Ð. 1036–1040.
4. Hanni H. Explaining the flame structure of non-nacreous pearls. The Australian Gemmologist. Vol. 24. No. 4. 2010. Ð. 85–88.
5. What are pearls: types and their origin. URL: https://jewellerymag.ru/p/pearls-types (date of appeal: 21.12.2020).
6. Types of pearls and their main producers. URL: https://mgc-labs.ru/zhemchug_types (date of appeal: 21.12.2020).
7. Conch pearls: what are they and why are they so rare? URL: http://www.thejewelleryeditor.com/jewellery/know-how/conch-pearls (date of appeal: 21.12.2020).
8. Acosta-Salmon H., Davis M. Cultivation of the Conch Pearl: A Comparison to Natural & What the Future Holds. URL: https://accreditedgemologists.org/pastevents/2011abstracts/SalmonDavis.php (date of appeal: 21.12.2020).
9. Fritsch E., Misiorowski E. The history and gemology of the queen conch ‘pearls’. Gems & Gemology. 1987. Winter. Ð. 208–231.
10. Bari H., Lam D., Hendrickson S. The Pink Pearl: A Natural Treasure of the Caribbean. URL: https://www.betterworldbooks.com/product/detail/the-pink-pearl-8861300138 (date of appeal: 21.12.2020).
11. Htun H, Larson B., Cole J.E. Melo Pearls from Myanmar. URL: http://www.palagems.com/melo-myanmar (date of appeal: 21.12.2020).
12. These Are All the Different Types of Pearls. URL: https://www.townandcountrymag.com/style/jewelry-and-watches/g2395/pearl-types (date of appeal: 21.12.2020).
13. Pearl Ñlam. URL: https://i.pinimg.com/originals/0d/e6/45/0de64547d60bbe35781a190eb300738e.jpg (date of appeal: 21.12.2020).
14. Joyce Wing Yan Ho. Large Natural Quahog Pearl. URL: https://www.gia.edu/gems-gemology/spring-2015-labnotes-large-natural-quahog-pearl (date of appeal: 21.12.2020).
15. Pearl Êo Hog. URL: http://j-gold.ru/zemcug-ko-hog-2 (date of appeal: 21.12.2020).
16. Can a scallop produce a pearl? URL: https://thepearlgirls.com/can-a-scallop-produce-a-pearl (date of appeal: 21.12.2020).
17. Sturman N., Homkrajae A., Manustrong A., Somsa-ard. N. Observations on Pearls Reportedly from the Pinnidae Family (Pen Pearls). Gems & Gemology. 2014. Fall. Vol. 50. No. 3. P. 202-215.
18. Scallop Pearls. URL: https://www.internetstones.com/scallop-pearls-lions-paw-atlantic-scallop-pearls-pacific-scallop-non-nacreous.html (date of appeal: 21.12.2020).