Message from Lab Director

Name: Dr. Laurent Massi

- Director of AIGS Gemstone Identification, Grading and Research Laboratory.

Credentials:

- PhD thesis in Physics - University of Nantes, France

Subject: “Studies of defects in brown and hydrogen-rich diamonds”

- DU of Gemology - University of Nantes, France
Subject: “The diffusion treatment of corundum”

- Institut National de Gemmologie - Paris, France

Publications:
(a PDF version of most of those articles is available by sending a request by email at info@aigslaboratory.com):

- Hainschwang T., Notari F., Fritsch E., Massi L., Rondeau B., Breeding C.M., Vollstaedt H. (2008) "HPHT treatment of CO₂ contaning and CO₂-related brown diamonds", Diamond and Related Materials, vol. 17, pp. 340 - 351.

- Massi L. (2007) AIGS Bangkok inspects an exceptional clinohumite from Tajikistan, I.C.A. InColor Magazine, Summer 2007, pp. 30 - 31.

- Massi L. (2007) Color-change bastnäsite-(Ce) from Pakistan, Gems and Gemology, vol. 43, No.2, pp. 165 - 166.

- Fritsch E., Hainschwang T., Massi L., Rondeau B. (2007) Hydrogen-Related Optical Centers in Natural Diamond: An Update, New Diamond and Frontier Carbon Technology, vol. 17, No. 2, pp. 63 - 89.

- Fritsch E., Massi L., Rossman G.R., Hainschwang T., Jobic S., Dessapt R. (2007) Thermochromic and photochromic behaviour of “chameleon” diamonds, Diamond and Related Materials, vol. 16, pp. 401 - 408.

- Massi L. (2006) Studies of defects in brown and hydrogen-rich diamonds, PhD thesis, University of Nantes - France, 372 pages.

- Hainschwang T., Notari F., Fritsch E., Massi L. (2006) “Natural, untreated diamonds showing the A, B and C infrared absorptions (“ABC diamond”) and the H2 absorption“, Diamond and Related Materials, vol. 15, pp. 1555 - 1564.

- Massi L., Fritsch E., Collins A.T., Hainschwang T., Notari F. (2005) “The ‘amber centres’ and their relation to the brown color in diamond”, Diamond and Related Materials, vol. 14, pp. 1623 - 1629.

- Massi L. « Les corindons à changement de couleur » [in French] “Color change corundum” (2005) Revue Française de Gemmologie AFG, No. 152, pp. 16 - 19.

- Massi L., Fritsch E., « les corindons diffusés » [in French] “The diffusion treatment of corundum” (1999) Revue Française de Gemmologie AFG, No. 152, pp. 16 - 19.