Josef Stefan
senior appraiser, master goldsmith, gemmologist, diamond diploma D. Gem. G., Scientific Gemmology Certificate - SSEF, certified expert

Tel. +43-1-515 60-203, Fax -555
Mon-Fri 8.00am - 3.00pm
E-mail: josef.stefan@dorotheum.at

Dorian Eckmann
Senior Manager of the Jewellery Laboratory, GIA Graduate Colored Stones Diploma, European Gemmologist FEEG, diamond expert

Tel. +43-1-515 60-277, Fax -555
Mon-Fri 8.00am - 3.00pm
E-Mail: dorian.eckmann@dorotheum.at

Alexander Spiesslechner
appraiser, goldsmith, diamond expert

Tel. +43-1-515 60-273, Fax -555
Mo-Fr, 8 - 15 Uhr
E-Mail: alexander.spiesslechner@dorotheum.at

Heinz Reitterer
Senior appraiser and consultant of the Dorotheum, master goldsmith, gemmologist, diamond diploma D. Gem. G

Tel. +43-1-515 60-265, Fax -555
on appointment
E-mail: juwelenlabor@dorotheum.at