 | | Report (volume) | | the world. Concise Field Report Volume 1: Pailin, Cambodia (Dec 2008 – Feb 2009) Vincent Pardieu GIA...Bangkok Figure 1: Rough natural ruby and blue sapphire from Pailin, Cambodia. Photo: V.Pardieu/GIA Laboratory............................ 4 AN INTRODUCTION TO PAILIN ....................................................... 8 THURSDAY, DEC 18TH, 2008: ARRIVING IN PAILIN: ................................................................................ 8 NOTES ABOUT PAILIN CURRENT ECONOMY AND SEVERAL SECURITY ASPECTS: |  | | Journal (issue) | | Branch: M. P. Gayton, F.G.A. South Yorkshire & District Branch: 1. R. M. Lewis, F.G.A. Examiners: B. W...A N D P R O C E E D I N G S OF THE GEMMOLOGICAL ASSOCIATION OF GREAT BRITAIN Vol, XVII N o . 8 OCTOBER...four gemstones were ranked as 'precious'—diamond, ruby, sapphire, and emerald, together with pearl, which...stones were thought of as some inferior form of ruby, all green stones, some form of emerald, etc., with...from clear cut. Information on the behaviour of ruby and sapphire on heat treatment is known from the |  | | Journal (issue) | | The Journal of Gemmology V o l u m e 26 No. 2 April 1998 The Gemmological Association and Gem Testing...comparative study of Barrington, Australia, and West Pailin, Cambodia, gemfields F.L. Sutherland1, D. Schwarz2,...ABSTRACT: Barrington, Australia, and West Pailin, Cambodia, basalt fields yield remarkably similar 'metamorphic'...'metamorphic' corundums (including ruby) and 'basaltic' type blue corundums. These represent different...sapphire, ruby, sapphirine, absorption spectra, trace elements, basalt, Barrington (Australia), Pailin (Cambodia) |  | | Book | | and characteristics Chemical tion: composi- Al 2 O 3 (aluminium oxide) Crystal system: Crystal class:...bipyramid, tabular hexagonal prism Varieties: Red= ruby Blue = sapphire All other colours are termed sapphire...·Refractive index: 1.762 - 1.770 + 0.008 - 0.006 o-ray = 1.1770 e-ray = 1.762 Birefringence: 0.008...Dichroic (weak to strong), o-ray usually more intensely coloured than e-ray Ruby: o-ray = purplish red; e-ray...Blue sapphire: o-ray = violetish blue; e-ray = greenish blue Absorption spectrum: Ruby (Cr) = fluorescent |  | | Journal (issue) | | ct emerald, (13) 1.99 ct red beryl, (14) 0.72 ct ruby, (15) 1.15 ct purplepink sapphire, (16) 5.54 ct...among both jewelers and consumers. These included ruby from Mong Hsu, Myanmar (Burma); blue and pink sapphires...other beryls, alexandrite and other chrysoberyls, ruby and sapphire, diamond, garnet, jade [both jadeite...as alexandrite. CORUNDUM Ruby. The 1990s witnessed continued supplies of ruby from the Southeast Asian...important sources (i.e., Myanmar [figures 5 and 6], Cambodia, and Thailand, with significant decrease in the |  | | Book | | and improving the quality of major stones such as ruby. In addition, many new artificial materials have...serious interest in gemstones. Cover illustration: A ruby, sapphire, emerald, citrine and diamond clip, mounted...Annie, Lucy, Clare and Peter Gemstones Michael O’ Donoghue London New York Chapman and Hall J1513G...America. Copy¬ right © GIA. Plate 18 Copyright © P. O. Knischka. Glossary The glossary includes those...compared to salt or quartz, but not compared to ruby, the particular conditions needed for the formation |
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Phnum O Tang, Pailin District, Pailin Province, Cambodia