THE NATURAL GEM is your partner for investments in gemstones and jewels.


Dr. Thomas Schröck

Founder and Chief Executive Officer

The founder and managing partner of THE NATURAL GEM has been active in international gemstone trading for 30 years. As a doctor of economics and a certified gemmologist in Switzerland, Germany and the USA, among other countries, he is one of Europe’s leading experts on naturally-coloured, untreated gemstones and investments in them.

His bestseller “Investing in Gemstones”, first published in 2017 and now in its third edition, is the first book to provide profound insights into the world of the most valuable stones in the world. It deals with both mineralogical and historical aspects of gemstones, explains what to look out for, and gives an overview of price developments.

Robert Ziegenfelder

Robert Ziegenfelder, MSc

Chief Operating Officer

Alexandra Stepan

Head of Office Operations

Alexandra Stephan

Niklas Koss

Sales Manager

Daniel Gruber

Sales Manager

Martin Bednarik

Martin Bednarik

F&B Manager

Marco Andrenelli


Marco Andrenelli