Contact information

Telephone number: +31646074475

Email Colin van Elderen:

Email Marsi Opals:


The studio is open on weekdays (you'll have to make an appointment) Evenings or weekends in consultation. If you don't have the opportunity to come by, there is also a lot possible virtually (by phone or via Whatsapp).



Keurbeek 58A

6914AH Herwen


The Netherlands

International Mineral Fair

Twice a year we are present with Marsi at the International Mineral Fair in Rijswijk (near The Hague).

There it is also possible to admire our Australian opals and discuss possibilities.

The next edition is on 14 & 15 October 2023.

Social Media

Marsi Opals - Only our Instagram account is in English

You can also contact us via this form