"Pearl and Pearling History"


Vortrag von Elisabeth Strack auf dem

PEARL SYMPOSIUM in Bahrein am 14. November 2019. 


>Website des Bahrain Institute for Pearls and Gemstones (DANAT)

"An Update on Pearl Localities"

Vortrag von Elisabeth Strack am 27. April 2019 auf dem Sinkankas-Symposium. 


>Sinkankas-Symposium Website 

"Freshwater Pearls of the World"

Vortrag von Elisabeth Strack am Freitag 9.2.2019, im Rahmen der AGTA-Seminare. "Thema: Freshwater pearls of the World"

Die "Recordings" der Seminare sind über AGTA zu beziehen.

>AGTA Website 

"An Overview of Pearl-Testing Methods"



Vortrag auf der AGTA GemFair Tucson, Februar 2018


>AGTA Website


"Diamonds are a Girl's Best Friend"

Vortrag von Fr. Elisabeth Strack in der VAN HAM Repräsentanz in Hamburg auf Einladung von Dr. Katrin Stangenberg und Dr. Nina Lindau-Thöne anläßlich des Ladies Night und Schmuck-Expertentag am 8.+9. November 2017.

>VAN HAM Website

IGC - International Gemmological Conference Windhoek (Namibia) - Oktober 2017

"Past and present situation of freshwater pearls from North Western Russia"

> Vollständiges Programm

> IGC-Website 

Download Vortrag
IGC 2017-E.pdf
Adobe Acrobat Dokument 97.6 KB
Download Figures
Adobe Acrobat Dokument 6.5 MB

AGTA Gemfair 2016 in Tucson

Identifying pearls: natural or cultured (beaded or non-beaded), original appearance or treated?


The talk will give a systematic classification of the various types of both natural and cultured pearls and of the most frequent treatments.


Natural pearls will be presented in the historical sequence of their appearance on the market, making a distinction between the classical pearl market that exists since antiquity and prevails until today and new sources of new types of pearls that entered the market in the last two decades only.


The known methods for producing cultured pearls will be explained and classified according to countries of origin and sequence of appearance. It will be discussed in how far an understanding of those methods helps to understand x-ray testing results; the emphasis is on micro-focus radiography but x-ray-tomography and x-ray fluorescence will also be explained.


The most common treatments for both natural and cultured pearls will be listed according to their influence on a pearl’s appearance and value: bleaching, waxing, polishing, surface coatings, polymer treatment, heating, chemical treatment and artificial dyeing. Methods of distinction will be discussed.

The present situation of freshwater pearls from Wisconsin

New Travels, New Pearls

Join us on Sunday, July 13, 2013 from 3-5 pm as the Pearl Society again hosts dynamic pearl aficionado Elisabeth Strack. Hailing from Hamburg, Germany, this fascinating author and pearl expert is renowned for her travels to the remotest corners of the world in search of extinct pearls and rarities. Ms Strack will share details about her quest for ancient pearl sources, and bring us up to date on new research. Come and hear this dynamic and very informative speaker share the fruits of her fascinating pearl quests!


Sunday, July 13, 2013 from 3 pm to 5 pm

at the Eve J. Alfillé Gallery & Studio, 623 Grove Street, Evanston, IL 60201


Please reserve now! 847-869-7920 or e-mail contact@evejewelry.com


> The Pearl Society Website

The first decade of the 21st century and beyond: Is the pearl market changing?


Elisabeth Strack examines the role of both natural and cultured pearls in the last 13 years and explores changes in quality assessment, marketing strategies and price developments. Natural pearls are no longer only costly rarities but have become precious objects that are highly sought after on an international level.


Cultured pearls have undergone changes in production techniques, resulting in bigger and more colorful Akoya cultured pearls from Japan and Vietnam and an ever-increasing, equally colorful variety of freshwater pearls from China and Japan. While production in China is challenged by environmental problems and changes in the working force, the market inside China for high quality pearls is growing ever bigger.  South Sea and Tahitian cultured pearls have undergone ups and downs in the last years, with fine qualities retaining their place. The latter is also true for niche producers like Mexico and the Fiji Islands. The seminar will include an overview of the pearl situation in the western market and will list methods for distinguishing the different types of pearls from each other. It will conclude with a forecast regarding further developments.


> Order the seminar program DVD

> AGTA Website

Vortrag von Elisabeth Strack, 13.-16. Oktober 2013 in Hanoi

33. Internationale Gemmologische Konferenz

Gemmological examination of jewellery objects from the Veliki Preslav treasure in Bulgaria (Elisabeth Strack and Ruslan I. Kostov).

Die Autoren untersuchten Smaragde und Perlen in Schmuckobjekten aus dem 10. Jahrhundert, die 1978 in der Nähe von Preslav, der ehemaligen Hauptstadt des Großen Bulgarischen Reiches, auf einem Feld gefunden wurden. Die Stücke sind heute Teil des Preslav-Schatzes im Museum von Veliki Preslav in Bulgarien.

Van Ham Kunstauktionen, Köln

“Diamonds are a Girl’s Best Friend – die 4 C’s der Diamantgraduierung”

Vortrag von Elisabeth Strack im Kunstauktionshaus Van Ham in Köln

am 10. Mai 2013.


Van Ham Kunstauktionen
Schönhauser Str. 10-16
50968 Köln

Telefon: 0221 / 92 58 62-0

> Website Van Ham Kunstauktionen

AGTA Gemfair Tucson 2013

AGTA-Seminare / Pearl Testing

How to distinguish cultured pearls from each other. 

Tucson Convention Center, 6. Februar 2013.

Hinweis: Dieser Vortrag kann als DVD über webmaster@agta.org bezogen werden. 


G.L.D.A. - Seminare

Pearl News

Starr Pass Marriott Resort & Spa

5. Februar 2013


> zur Agta Website

GIT 2012 The 3rd International Gem & Jewelry Conference

Zur Website der GIT

Vortrag von Elisabeth Strack: European freshwater pearls: Geographical origin, role in the pearl market and applied identification methods.


13. bis 16. Dezember 13-16, 2012 in Bangkok. 


> Website der International Gem & Jewelry Conference

Tucson 2012


February 4, 2012 - 9.00-10.00 a.m.

Mohave Room, Tucson Convention Center.

Niche Pearl Producing Countries: Mexico, Fiji Islands,

Cook Islands, Sudan (Red Sea), Gulf States (Persian Gulf),

Lake Kasumigaura in Japan.


> Website der AGTA



January 31, 2012, 8.45 – 9.45 a.m.

Tucson Starr Pass Marriott Resort Hotel

New Developments in the Cultured Pearl Industry: Akoya cultured

pearls from Japan, Vietnam and China - China and its varieties of beaded cultured freshwater pearls - the South Sea and Tahitian cultured pearl markets - niche producers.


February 1, 2012, 9.30 – 10.30 a.m.

Pearl treatments old and new: treatments include all processes applied to enhance the beauty and saleability of pearls: bleaching, „pinking“, polymer treatment, irradiation, heating, dyeing and a combination thereof. The talk will include disclosure practices and testing procedures.


> Website der GLDA


Vorträge 2011

32. Internationale Gemmologische Konferenz in Interlaken, 13.-17.7.2011

Elisabeth Strack: "An overview of production techniques for Chinese freshwater cultured pearls".

Foto: Gemmologisches Institut Hamburg
Foto: Gemmologisches Institut Hamburg

Foto aus dem Vortrag: Mantelgewebe einer chinesischen Perlmuschel (Hyriopsis cumingii) mit den Perlen im jeweiligen Perlsack kurz vor der Ernte.



GIA International Gemological Symposium 2011


Elisabeth Strack und Michael M. Krzemnicki:


"Experimental treatments involving heat and dye for Chinese freshwater cultured pearls and their detection with Raman spectrometry".


> Website des GIA Symposiums


> Proceedings bestellen