Adolf Peretti

Adolf Peretti
GRS Gemresearch Swisslab · Gemology

19.53
 · 
PhD, FGG, FGA, EurGeol

About

97
Publications
24,358
Reads
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355
Citations
Introduction
I am a research scientist of the private industry and finance my research through GRS RD, describe myself as a generalist that like to work in the field and discover minerals or gems and travel extensively all-over the world (Burma, Vietnam, Africa). Perettiite-(Y) is a new mineral with the formula Y3+ 2Mn2+ 4Fe2+ [Si2B8O24], (IMA Commission on New Minerals, Nomenclature and Classification No. IMA 2014-109).
Research Experience
December 1996 - present
GRS Gemresearch Swisslab
Position
  • CEO Laboratory Director
Description
  • Head of gemological laboratories in Switzerland, Hong Kong, Thailand and Sri Lanka
January 1988 - January 1993
Gübelin Gem Lab
Position
  • Laboratory Head
December 1983 - December 1987
ETH Zurich
Position
  • Assitant
Education
August 1983 - July 1987
ETH Zurich
Field of study
  • Mineralogy and Petrography
July 1978 - July 1983
University of Zurich
Field of study
  • Earth Science Petrography

Publications

Publications (97)
Poster
Full-text available
Fluid inclusion analysis including Raman spectroscopy within in the famous vibrant red spinels from Mansin (East-Mogok) have revealed that the spinels are formed from sulfur-dominated chloride carbonate melt in an extremely reduced acid environment. It is the first comprehensive model for the formation of Burmese spinels that may also help to under...
Data
Full-text available
Technical Report
Full-text available
The new world record for the largest laboratory-grown diamond crystal is 60.00 ct and this gem was produced during the first week of July 2015 at the New Diamond Technology (NDT) facility in St. Petersburg (Russia) during a visit by Branko Deljanin, CGL-GRS (Canada). In April 2015 NDT produced experimentally 32.26ct colorless gem quality diamond cr...
Article
Full-text available
A new type of synthetic blue diamonds appeared on the market. These diamonds were identied as CVD-grown. Optical spectroscopy revealed that they are of type IIa and their colour is caused by strong absorption of very intense silicon-related SiV-center (negatively charged Silicon and Vacancy centre). A structural and chemical layering was identied b...
Article
Full-text available
Whereas colored andesine/labradorite had been thought unique to the North American continent, red andesine supposedly coming from the Democratic Republic of the Congo (DR Congo), Mongolia, and Tibet has been on the market for the last 10 years. After red Mongolian andesine was proven to be Cu-diffused by heat treatment from colorless andesine start...
Article
Chemical profile analyses by LA-ICP-MS and EMPA analysis revealed characteristic chemical differences between different colour zones in copper-bearing tourmalines from Mozambique and Brazil. From the core to the rim of the tourmaline crystals chemical variations were found for the elements Be, F, Mg, Ti, Fe, Cu, Zn, Mn, Sb, Nb, Ta, U, Th, Pb...
Article
Apatites derived from different rock types have distinctive absolute and relative abundances of trace elements including rare-earth elements (REE). [1] In this study, apatite inclusions in natural gem-quality corundum and spinel were analysed. They originate from the world’s most important mining areas including Myanmar, Vietnam, Sri Lanka, Ma...
Article
Full-text available
The crystal structure of johachidolite, CaAl[B3O7], (Cmma, a = 9.767(2) b = 11.723(3), c = 4.3718(5) angstrom, V = 408.3(1) angstrom(3), Z = 4) has been refined (R1 = 2.5 %) from a light-green gem-quality crystal from the Mogok gem-mining district in Myanmar. A fragment from the same gem was measured by electron microprobe and Laser-Ablation Induct...
Article
Full-text available
Pezzottaite is a new mineral from the Sakavalana pegmatite, located 25 km south of the village of Mandosonoro, southwest of the town of Antsirabe, 140 km southwest of Ambatofinandrahana, in Fianarantsoa province, central Madagascar. It usually occurs as isolated crystals that can have three distinct habits: (1) irregularly shaped flat masses that f...
Article
Full-text available
The crystal structure of the rare hexagonal mineral painite [a = 8.724(1), c = 8.464(2) Å] from Mogok (Myanmar), with the ideal composition CaZrB[Al9O18], was re-determined by single-crystal X-ray diffraction. Structure refinements were performed in space groups P63/m and P63. The centrosymmetric P63/m model yielded excellent agreement (R1 = 1.44%,...
Article
Full-text available
In 2002, a new gem mineral of commercial importance was discovered. In accordance with the need for all new mineral discoveries to be scientifically characterized (see Nickel and Grice, 1998), the gemological community anxiously awaited the results of tests to positively identify the new mineral (Hawthorne et al., 2003, Hawthorne et al., submitted...
Article
Full-text available
Pezzottaite, ideally Cs(Be2Li)Al2Si6O18, is a new gem mineral that is the Cs,Li-rich member of the beryl group. It was discovered in November 2002 in a granitic pegmatite near Ambatovita in central Madagascar. Only a few dozen kilograms of gem rough were mined, and the deposit appears nearly exhausted. The limited number of transparent faceted ston...
Article
Full-text available
Most Russian hydrothermal synthetic rubies and pink, orange, green, blue, and violet sap-phires - colored by chromium and/or nickel - reveal diagnostic zigzag or mosaic-like growth structures associated with color zoning. When the samples are properly oriented, these internal patterns are easily recognized using a standard gemological microscope in...
Article
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Gemologist Dr A. Peretti reports on the sensational sales of two rare and historical jewelry pieces recently auctioned in Sotheby's New York and Phillips Geneva
Article
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Dr. A. Peretti, founder and director of GRL Gemresearch Laboratory, Lucerne, Switzerland, speaks on the origins of sapphire and ruby and introduces the color terms pigeon's blood, cornflower blue and royal blue.
Article
Full-text available
Seleccionar todos Título: Rubíes de Mong Hsu Autores: Peretti, Adolf; Schmetzer, Karl; Bernhardt, Heinz-Jürgen; Mouawad, Fred Revista: Boletín del Instituto Gemológico Español, 1996 JUL; (37) Página(s): 42-62 ISSN: 02107228. © UCM 2012, Biblioteca de la Universidad Complutense. Inicio | Revistas | Artículos | Boletines | Mis Suscripciones | Compati...
Article
Full-text available
Synthetic alexandrite is being flux-grown in Rz~ssia in a molybdenum-, bismuth-, and germanium-bearing solvent by means o{ the reverse-temperature gradient method. Characteristic properties include habit, twinning, growth patterns, residzial flux inclusions , trace-element contents, chemical zoning, color zoning, and spectroscopic feat~zres in the...
Article
Full-text available
During regional metamorphism of the Malenco serpentinized peridotite (Sondrio, northern Italy), the mineral assemblage pentlandite-awaruite-magnetite-native copper-antigorite-brucite-olivine-diopside is formed. The opaque assemblage indicates very reduced fluids with fO2 values 4 log units below QFM. Primary fluid inclusions were trapped in diopsid...