ruby

  • Ruby & Sapphire Color Types • From Peacock to Pigeon's Blood

    From Peacock to Pigeon's Blood: Deconstructing Lotus Color Types

    A brief description of the color types for ruby and sapphire used at Lotus Gemology.

  • Ruby & Sapphire Colors • From Peacock to Pigeon's Blood

    From Peacock to Pigeon's Blood

    From Peacock to Pigeon's Blood  •  An Introduction to Ruby & Sapphire Colors

    Lotus Gemology  |  2017

    An introduction to the ruby & sapphire color types used at Lotus Gemology.

    From Peacock to Pigeon's Blood Order Page 

  • Ruby and Spinel in Tajikistan • Moon Over the Pamirs • Lotus Gemology

    Moon Over the Pamirs  |  Chasing Ruby and Spinel in Tajikistan

    A 2006 mission to remote ruby and spinel localities in Tajikistan.

  • Ruby Connoisseurship • Seeing Red

    Seeing Red  |  A Guide to Ruby Connoisseurship

    A loving look at ruby – the gem of passion – from the standpoint of the connoisseur.

  • Ruby, Pink Sapphire & Padparadscha • Walking the Line

    Ruby, Pink Sapphire & Padparadscha • Walking the Line • Lotus Gemology

    An examination of the problem of separating pink sapphire and padparadscha from ruby.

  • Ruby, Sapphire & Spinel Auction Records • Under the Hammer • Lotus Gemology

    Ruby, Sapphire & Spinel Auction Records • Under the Hammer • Lotus Gemology

    World auction records for ruby, sapphire and spinel.

  • Ruby, Sapphire & Spinel: An Archaeological, Textual and Cultural Study • Book Review

    Book Review: Ruby, Sapphire & Spinel: An Archaeological, Textual and Cultural Study

    Ruby, Sapphire & Spinel: An Archaeological, Textual and Cultural Study By Derek J. Content, 2016. Brepols Publishers, Turnhout, Belgium, www.brepols.net, 452 pages, illus., ISBN 978-2503568089. €150.00 hardcover.

  • Rutile in Corundum • Following the Silk Road • Lotus Gemology

    Following the Silk Road  |  Rutile in Corundum

    A discussion of rutile silk in corundum and its use in detecting artificial heat treatment. Careful examination of these "silk" inclusions can provide vital clues to unmask heated gems.

  • Rutile Silk in Sapphire • Discovery in 1878

    Discovery of rutile silk in sapphire

    In 1878, the noted Austrian mineralogist, Gustav Tschermak von Seysenegg [1836–1927], was the first to properly identify silk in corundum, finding it to be composed of the mineral rutile (TiO2). An English translation of his landmark paper is included, along with the original German version.

  • Spinel • Resurrection of a Classic • Lotus Gemology

    Burmese spinel

    Since the turn of the millennium, the price of fine spinel has risen at an incredible pace. No longer simply the poor man's ruby, spinel is finally getting the attention it deserves as one of the world's premier gems.

  • Thanks to those who have helped Lotus Gemology

    No one can go it alone. We would like to thank the many individuals who have helped us over the years. Please excuse us if we have missed anyone.

    Family

    • Phyllis and Robert Hughes, RWH's mother and father, USA
    • David Hughes & Andrea Carney, RWH's brother and sister-in-law, USA
    • The extended Manorotkul clan, Thailand

    Special Thanks

    • Marc Bogerd, Thailand
    • John Emmett & Karen Palmer, Crystal Chemistry, USA
    • Olivier Galibert, Hong Kong
    • Gem and Jewelry Institute of Thailand, (with special thanks to Wilawan Atichat, Pornsawat Wathanakul, Chakkaphan Sutthirat, Thanong Leelawatanasuk, Visut Pisutha-Arnond, Wandee Mansrisuk)
    • John & Kristi Koivula, microWorld of Gems & the GIA
    • William Larson, Jeanne Larson, Josh Hall, Gabriel Mattice, John McClean, Jason Stephenson, William Larson, Jr., Carl Larson and the rest of the gang at Pala International, USA
    • Vincent Pardieu, Fieldgemology.org & GIA, Thailand
    • Julie Poli, Vietnam
    • Dana Schorr (r.i.p.), Schorr Marketing, USA

    Merci

    • Lafir M. Abbas, The Choice, Sri Lanka
    • Ahmadjan Abduriyim, GIA, Japan
    • Lewis Allen, Lucas Amelung & Hans Pfister, Crown Color, Thailand & Hong Kong
    • Rick Allen, Gem-Land Adventures, USA
    • Apporv, Siam Pioneer Gems, Thailand
    • E. "Hanuman" Aspler, Ganoksin.com, Thailand
    • Zaheer Azizi, Azizi Enterprises, Thailand
    • Walter Balmer, Switzerland
    • Tom Banker, Thailand
    • Bill Barker (r.i.p.), Barker & Co., USA
    • Adolfo & Marta de Basilio, Spain
    • Steven Baughman, USA
    • Joe & Pirapan Belmont, KV Gems, Thailand
    • Steve Bennett, GemsTV, UK
    • Jeffery Bergman, Primagem, Thailand
    • Riccardo Bertoncelli, Italy
    • Jeffrey Bilgore, USA
    • Rick Blankenhorn, the Gemmary, USA
    • Dudley Blauwet & Kevin Ringer, Mountain Minerals, USA
    • Edward Boehm, RareSource.com, USA
    • Gary Bowersox, Geovisions, USA
    • George Bosshart (r.i.p.), Switzerland
    • Eric Braunwart, Columbia Gem House, USA
    • James Breski, USA
    • Barry Broman, USA
    • Cal Brown, USA
    • Peter & Eileen Brown, Australia
    • Richard Brown, Thailand
    • Grahame Browne (r.i.p.), Australia
    • Charles Cameron, USA
    • Anne Carroll Marshall, Hong Kong
    • Cartier, France
    • Loretta Castoro, USA
    • Tom Chatham, Chatham Gems, USA
    • Thongsak Chintakanrock, Expert Gems, Thailand
    • Christie’s, various locations
    • Fred & Sopha Chu, Prosper International, Thailand
    • Ed Cleveland, Kashmir Blue, USA
    • Terry Coldham, Australia
    • Chris Cooney, Gem Mountain, USA
    • Paula Crevoshay & Martin Bell, Crevoshay Co., USA
    • Tom Cushman, Madagascar
    • Bruce Davidson (r.i.p.), Sri Lanka
    • Dona Dirlam, GIA Library, USA
    • Katia Djevahirdjian, Hrand Djevahirdjian, Switzerland
    • Richard Drucker & Stuart Robertson, Gemworld, USA
    • Garry Du Toit, Thailand
    • Manfred Eickhorst, Eickhorst, Germany
    • Jim & Jennie Elliot, Australia
    • Hemi Englisher, Gemcal, Thailand
    • Thomas Färber, Switzerland
    • Elaine Ferrari-Santhon, USA
    • Conny Forsberg, Sweden
    • Thomas Frieden, Frieden & Co., Switzerland
    • Masaki Furuya, Japan
    • Lyndsey Roy Hamm, Canada
    • Ian Harebottle, Adrian Banks & Gabriella Harvey, London
    • Gems By Nomads, Thailand
    • Didier Giard, France
    • David Glickman (r.i.p.), Thailand
    • Jan Goodman, Jan Goodman Co., Thailand
    • Gene Goldsand, USA
    • Mike and Pat Grey, Coast-to-Coast Gems, USA
    • Daniel Grondin, Madagascar
    • Peter Grumitt, Apsara Gems, UK
    • Eduard Gübelin (r.i.p.), Switzerland
    • Thomas Hainschwang, GGTL Laboratories, Liechtenstein
    • Tino Hammid (r.i.p.), Tino Hammid Photography, USA
    • Henry Hänni, Switzerland
    • Hayley Henning, TanzaniteOne, USA
    • Han Htun, Stalwart Gems & Laboratory, Myanmar
    • George Harlow, American Museum of Natural History, USA
    • Alan & Charlene Hodgekinson, UK
    • Hpone-Phyo Kan-Nyunt, Gübelin Gem Lab, Hong Kong
    • Simon Hsu, Sino Resources, Hong Kong
    • Neal Hurni, Lewis and Clark Sapphires, USA
    • Christina Iu, Japan
    • Kunal Jain, Sachi Gems & Tools, Thailand
    • Matee Jungsanguansith, World Sapphire, Thailand
    • Leonard S.N. Kalindekafe & Levison Wesley Undi, Malawi
    • Susie & Kennedy Kamwathi, Kennedy's Gems, Kenya
    • Robert Kane, Fine Gems International, USA
    • John Kanyangira, Rwanda
    • Alice Keller, USA
    • Allen Kleiman, USA
    • Ajith Konara, Kaluganga Gem Centre, Sri Lanka
    • Nickolai Kouznetzov, Russia
    • Rick Krementz, USA
    • Michael Krzemnicki, Laurent Carier & Jean-Pierre Chalain, SSEF, Switzerland
    • Tony Laughter, USA
    • Brendan Laurs, USA
    • Barbara Lawrence, USA
    • Tom Lee, USA
    • Alexander Leuenberger, Switzerland
    • Peter Lyckberg, Sweden
    • Louis Lo, Hong Kong
    • Abdul Mahomed, Royal Group, Malawi
    • Jeff Mason & Don Kay, Mason-Kay, USA
    • Neal Masson, Thailand
    • Antoinette Matlins, USA
    • Shane McLure, GIA, USA
    • Yianni Melas, Cyprus
    • Wong Ming, Hong Kong
    • Justin Mmbaga, Longido, Tanzania
    • Robert, Fred and Pascal Mouawad
    • Roland Naftule, USA
    • Omi & Niveet Nagpal, Omi Gems, USA
    • Kurt Nassau (r.i.p.), USA
    • Robert G. Nkini, Tanzania
    • Marc Noverraz, Madagascar
    • Daniel Nyfeler & Lore Kiefert, Gübelin Gem Lab, Switzerland
    • Donald A. Palmieri, USA
    • Adam Parker, York Museum, UK
    • Adolf Peretti, GRS, Bangkok
    • Paul Picus, Mexico
    • Ronnachai Porwongsawang, Elegant Gems, Thailand
    • Jeffrey Post & Russell Feather, Smithsonian Institution, USA
    • Todd A. Pownell, USA
    • Charlotte Preston (r.i.p.), USA
    • Prida Tiasuwan, Pranda, Thailand
    • Ali Sanaei Rad, Central Bank of Iran
    • Nirina Rakotosaona, Madagascar
    • Peter Read (r.i.p.), UK
    • Ricardo V. Reyes
    • James Riley, UK
    • Elaine Rohrbach, Gem-Fare, USA
    • The Rogers Family, USA & Thailand
    • Doug Ross, USA
    • George Rossman, CalTech, USA
    • Chavalit Salwala, Thai Lapidary, Thailand
    • Saw Naung U (r.i.p.), Daw Khin Soe Myint, Saw Sanda Soe & Ei Ei, Myanmar
    • Alberto Scarani & Mikko Åstrom of GemmoRaman, Italy & Finland
    • Ken & Sriurai Scarratt, Thailand
    • Joseph Schall, USA
    • Jeff Scovil, Scovil Photography, USA
    • Rogers S. Sezinga, Tanzania
    • John, Mark & Eric Saul, France & Tanzania
    • Jon Sigerman, USA
    • Santpal Sinchawla, Sant Enterprises, Thailand
    • Manus Siripatvanich, House of Goldsmiths, Thailand
    • Elise Skalwold, Cornell University, USA
    • Christopher Smith, AGL, USA
    • Mark Smith, Thai-Lanka Trading, Thailand
    • Somkhit Sodkaew, Sapphire Miners Cyangugu, Rwanda
    • Sotheby’s, various locations
    • Tim Spauwen, The Netherlands
    • David Squires, InStore magazine, USA
    • Martin Steinbach, Germany
    • Judy Steinberg-Bricker, USA
    • Issac Stern, Thailand
    • John and Linda Stimson, Rocks of Ages, USA
    • Patrick Streeter, UK
    • Chetan and Kaimesh Sukhadia, Sukhadia Stones, Thailand
    • Abe Latif Suleman, Tucker International, Tanzania
    • Sarawut Sunantra, Wongwan Gems, Thailand
    • Maha Tannous, USA
    • Tay Thye Sun, Singapore
    • Por Kuang Tang, PK Gems and Gold, Thailand
    • Petcharaporn Tantiwong, Lapis Gemologists, Thailand
    • Tom & Myriam Tashey, Professional Gem Sciences, USA
    • Ted & Angelo Themelis, Gemlab, Thailand
    • Matt Thompson, USA
    • Veerasak and Tanyaporn Trirotanan, Veerasak Gems, Thailand
    • Votha Un (r.i.p.), Cambodia
    • Harold & Erica Van Pelt, USA
    • Jim Varak, Australia
    • Ben Vardi of Vardi Coloredhouse
    • Fred (r.i.p.) & Charlotte Ward, USA
    • Simon & Laurie Watt, Mayer & Watt, USA
    • Robert & Rolf Weiser, USA
    • David Weinberg, Multicolour Gems, Bangkok
    • Robert Weldon, GIA, Thailand
    • Bear & Cara Williams, USA
    • Jack Wilson, Australia
    • Richard & Rebekah Wise, USA
    • John Woodmark & Bruce Moore, Desert Sun Mining & Gems, USA
    • Larry Woods, Jewels from the Woods, USA
    • Vlad Yavorskyy, Yavorskyy, Thailand
    • Wilson Yuen, Able Lapidary, Hong Kong
    • Philip Zahm & family, Philip Zahm Designs, USA
    • Ray & Sheila Zajicek, Equatorian Imports, USA
    • Gamini Zoysa, Mincraft, Sri Lanka
    • Urs Zwyssig, Thailand
  • Verneuil Synthetic Corundum ID • Dangerous Curves • Lotus Gemology

    Dangerous Curves • A Reexamination of Verneuil Synthetic Corundum

    Virtually all gemologists are aware of the curved growth lines and gas bubbles in Verneuil (flame-fusion) synthetic corundum, but few understand exactly why they occur and how they are distributed in these stones. This article clarifies these important identifying features.

Back to top