[1] Univ Bern, Inst Geol Sci, CH-3012 Bern, Switzerland
[2] ETH, Inst Geochem & Petr, CH-8092 Zurich, Switzerland
[3] Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany
[4] ARC Ctr Excellence Ore Deposits, Hobart, Tas 7001, Australia
[5] Univ Nevada, Dept Geosci, Las Vegas, NV 89154 USA
[6] St Marys Univ, Dept Geol, Halifax, NS B3H 3C3, Canada
[7] Gubelin Gem Lab Ltd, CH-6006 Luzern, Switzerland