[en] The reliquary crown, hosted in the diocesan museum of Namur, was produced during the beginning of the 13th century to shelter a fragment of the holy crown of thorns. This beautiful piece of goldsmithery is made of eight gold plates, topped by round lobes, and connected to each other by hinges blocked with a pin decorated by a pearl. The crown is decorated by filigrees, flowers, and approximately 400 pearls and coloured (green, reddish pink, turquoise, red, blue) stones showing simple cutting with various sizes and shapes. Raman and portable X-ray fluorescence spectrometer (pXRF) techniques have been used to determine the nature and sources of all samples, as well as the composition of filigrees. Analyses have identified emeralds from Pakistan, reddish pink spinels from Tajikistan, red almandine garnets from India, turquoise from Iran, blue sapphires from Sri Lanka or Myanmar, and European pearls. The filigrees contain approximately 86 wt % Au, 7 wt % Ag, and 7 wt % Cu, thus confirming a gold-rich composition. The gemstones, contemporary with the crown, probably arrived in Europe by the silk trade road.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Bruni, Yannick ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
George, Philippe ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie ; Liège Treasure of the Cathedral, Liège, Belgium
Cambier, Hélène; Musée Diocésain, Cathédrale Saint-Aubain, Place Saint Aubain, Namur, Belgium
Strivay, David ; Université de Liège - ULiège > Unités de recherche interfacultaires > Art, Archéologie et Patrimoine (AAP)
Language :
English
Title :
A gemmological study of the reliquary crown of Namur, Belgium
Abu-Lughod, J. L.: Before European hegemony: The World System, A.D., 1250-1350, The business History Rev., 64, 362-364, 1990.
Amar, Z. and Lev, E.: Most-Cherished Gemstones in the Medieval Arab World, J. Royal Asiatic Soc., Series 3, 27, 377-401, 2017.
Athavale, S. A. and Hambarde, M. S.: Raman scattering: Fingersprint for Identification of nature and color origin of Pearls, Int. Res. J. Eng. Technol. (IRJET), 7, 2065-2078, 2020.
Atikarnsakul, U., Vertriest, W., and Soonthorntantikul, W.: Characterization of blue sapphires from the Mogok stone tract, Mandalay region, Burma (Myanmar), GIA News from Research, Special Issue, 1-56, 2018.
Aurisicchio, C., Conte, A. M., Medeghini, L., Ottolini, L., and De Vito, C.: Major and trace element geochemistry of emerald from several deposit: Implications for genetic models and classification schemes, Ore Geol. Rev., 94, 351-366, 2018.
Bariand, P. and Poirot, J.-P.: Larousse des pierres précieuses, Larousse-Bordas, Paris, 288 pp., 1998.
Brose, H.W.: A Short History of Faceting, Lapidary J., 2, 446-452, 1954.
Bruni, Y., Hatert, F., George, P., and Strivay, D.: The Reliquary bust of Saint Lambert from the Liège cathedral, Belgium: gemstones and glass beads analysis by pXRF and Raman spectroscopy, Archaeometry, 62, 297-313, 2019.
Bruni, Y., Hatert, F., George, P., and Strivay, D.: An archaeometric investigation of glass beads decorating the reliquary of Saint Simètre from Lierneux, Belgium, J. Archaeol. Sci. Report, 32, 1-6, 2020.
Calligaro, T., Périn, P., Vallet, F., and Poirot, J-P.: Contribution à l'étude des grenats mérovingiens (Basilique de Saint-Denis et autres collections du musée d'Archéologie nationale, diverses collections publiques et objets de fouilles récents), Antiquités Nationales, 38, 111-144, 2007.
Calligaro, T. and Périn, P.: Le commerce des grenats à l'époque mérovingienne, Archéopages, HS 5, 109-120, 2019.
Carò, F., Schorsch, D., and Santarelli, B.: Proveniencing Turquoise Artifacts from Ancient Egyptian Contexts: A Non-invasive XRF Approach, Sci. of Anc. Egypt. Mat. and Tech. (SAEMT) conference, Abstract book, 2017.
Chen, Q., Yin, Z., Qi, L., and Xiong, Y.: Turquoise from Zhushan County, Hubei province, China, Gems Gemol., 48, 198-204, 2012.
Chulapakorn, T., Intarasiri, S., Bootkul, D., and Singkarat, S.: Identification of deposit types of natural corundum by PIXE, Nuclear Instruments and Methods in Physics Research, B331, 108-112, 2014.
Collet, E.: Trésors classés de la Cathédrale de Namur, Fondation roi Baudouin, Belgium, 40 pp., 2013.
Culka, A. and Jehlička, J.: A database of Raman spectra of precious gemstones and minerals used as cut gems obtained using portable sequentially shifted excitation Raman spectrometer, J. Raman Spectrosc., 50, 262-280, 2019.
Demaude, M.: Etude gemmologique de pièces d'orfèvrerie du Trésor de la Cathédrale Saint-Paul de Liège, Master thesis, University of Liège, 81 pp., 2016.
Demaude, M., Bruni, Y., Hatert, F., and Strivay, D.: Étude gemmologique de la croix-reliquaire à double traverse du Trésor de la Cathédrale de Liège, Trésor de Liège, Bulletin trimestriel, 50, 9-15, 2017.
Ferreira de Araújo Neto, J., de Brito Barreto, S., Andressa Carrino, T., Müller, A., and Montefalco de Lira Santos, L. C.: Mineralogical and gemological characterization of emerald crystals from Paraná deposit, NE Brazil: a study of mineral chemistry, absorption and reflectance spectroscopy and thermal analysis, Brazilian J. Geol., 49, 1-15, 2019.
Fritsch, E. and Rossman, G. R.: An update on color in gems. Part1: Introduction and colors caused by dispersed metal ions, Gems Gemol., 23, 126-139, 1987.
Fritsch, E. and Rossman, G. R.: An update on color in gems. Part2: Colors involving multiple atoms and colors centers, Gems Gemol., 24, 3-15, 1988.
Gaborit-Chopin, D.: Les couronnes du sacre des rois et des reines au trésor de Saint-Denis, Bull. Monumental, 133, 165-174, 1975.
Gilg, H. A., Gast, N., and Calligaro, T.: Vom Karfunkelstein, Archäologische Staatssammlung, 37, 87-100, 2010.
Giuliani, G., Chaussidon, M., Schubnel, H.-J., Piat, D. H., Rollion- Bard, C., France-Lanord, C., Giard, D., de Narvaez, D., and Rondeau, B.: Oxygen Isotopes and Emerald Trade Routes since Antiquity, Sciences, 287, 631-633, 2000.
Giuliani, G., Ohnenstetter, D., Fallick, A. E., Groat, L., and Fagan, A.,J.: The geology and genesis of gem corundum deposits, Mineral. Assoc. Canada Short Course, 44, 29-112, 2014.
Giuliani, G., Fallick, A. E., Boyce, J., Pardieu, V., and Pham, V.- L.: Pink and red Spinels in marble: Trace elements, Oxygen isotopes, and Sources, Can. Mineral., 55, 743-761, 2017.
Giuliani, G., Groat, L. A., Marshall, D., Fallick, A. E., and Branquet, Y.: Emerald Deposits: A Review and Enhanced Classification, Minerals, 9, 1-63, 2019.
Gontero-Lauze, V: Les pierres du Moyen Age, Les Belles Lettres, Paris, France, 222 pp., 2012 Greiff, S.: Naturwissenschaftliche Untersuchungen zur Frage der Rohsteinquellen für frühmittelalterlichen Almandingranatschmuck rheinfränkischer Provenienz, Jahrb. Römisch- Germanischen Zentral Museums Mainz, 45, 599-645, 1999.
Groat, L. A., Giuliani, G., Marshall, D. D., and Turner, D.: Emerald deposits and occurrences: A review, Ore Geol. Rev., 34, 87-112, 2008.
Gübelin, E. J.: Gemstones of Pakistan: Emerald, Ruby, and Spinel, Gems Gemol., 18, 123-139, 1982.
Habermann, D., Banerjee, A., Meijer, J., and Stephan, A.: Investigation of manganese in salt- and freshwater pearls, Nuclear Instrum. Methods Phys. Res. B, 181, 739-743, 2001.
Harrell, J. A.: Archaeological Geology of theWorld's First Emerald Mine, Geosci. Canada, 31, 69-76, 2004.
Jehlička, J., Culka, A., Vandenabeele, P., and Edwards, H. G. M.: Critical evaluation of a handheld Raman spectrometer with near infrared (785 nm) excitation for field identification of minerals, Spectrochim. Acta, A80, 36-40, 2011.
Kadleíková, M., Breza, J., and Vesely, M.: Raman spectra of synthetic sapphire, Microelectronics J., 32, 955-958, 2001.
Karampelas, S., Fritsch, E., Makhlooq, F., Mohamed, F., and Al- Alawi, A.: Raman spectroscopy of natural and cultured pearls and pearl producing mollusc shells, J. Raman Spectrosc., Special Issue, 1-9, 2019.
Khorassani, A. and Abedini, M.: A new study of turquoise from Iran, Mineral. Mag., 40, 640-642, 1976.
Krzemnicki, M. S.: Spinel: A Gemstone on the rise, SSEF, Hong Kong conference, 27 pp., 2010.
Kunz, G. F. and Stevenson, C. H.: The book of the Pearl: The History, Art, Science, and Industry of the Queen of Gems, The Century Company, New York, USA, 552 pp., 1908.
Lucas, A., Sammoon, A., Jayarajah, A. P., Hsu, T., and Padua, P.: Sri Lanka: Expedition to the Island of jewels, Gems Gemol., 50, 1-59, 2014.
Malsy, A. and Klemm, L.: Distinction of Gem Spinels from the Himalayan Mountain Belt, Chimia, 64, 741-746, 2010.
Nagai, K.: A History of the Cultured Pearl Industry, Zool. Sci., 30, 783-793, 2013.
Ovissi, M., Yazdi, M., and Ghorbani, M.: Turquoise grading in Persian historical and modern times; a comparative study, 35th National Geosciences Conference of Geological Survey of Iran, Tehran, 19-21 February 2017, 1-6, 2017.
Pardieu, V. and Farkhodova, T.: Spinel from Tajikistan: The Gem that Made Famous theWorld "Ruby", InColor Magazine, Special Spinel, 43, 30-33, 2019.
Pehrson, E. A. K.: Identification methods of Sri Lanka corundum in comparison to other common gemstones, Uppsala University, Department of Earth Sciences, 5, 1-32, 2017.
Pogue, J. E.: The turquoise: A study of its History, Mineralogy, Geology, Ethnology, Archaeology, Mythology, Folklore and Technology, Memoirs of the National Academy of Sciences, Cornell University Library, USA, 12, 642 pp., 1915.
RRUFF: Integrated Database of Raman Spectra, available at: http: //rruff.info/ (last access: 5 January 2021), 2020.
Saeseaw, S., Sangsawong, S., Vertriest, W., Atikarnsakul, U., Raynaud-Flattot, L. V., Khowpong, C., and Weeramonkhonlert, V.: A study of sapphire from Chanthaburi, Thailand and its gemological characteristics, GIA News from Research, Special Issue, 1-42, 2017.
Salet, F.: La chasse des Saints-Innocents au trésor de la cathédrale de Cologne, Bull. Monumental, 125, 311-312, 1967.
Sevillano-López, D. and González F. J.: Mining and Minerals trade on the silk road to the ancient literary sources: 2 BC to 10AD centuries, in: History of Research in Mineral Resources, edited by: Ortiz, J. E., Puche, O., Rábano, I., and Mazadiego, L. F., Cuadernos del Museo Geominero, Instituto Geológico y Minero de España, Madrid, Spain, 13, 43-53, 2011.
Shor, R. and Weldon, R.: Ruby and sapphire production and distribution: A quarter century of change, Gems Gemol., 45, 236-259, 2009.
Simonet, C., Fritsch, E., and Lasnier, B.: A classification of gem corundum deposits aimed towards gem exploration, Ore Geol. Rev., 34, 127-133, 2008.
Sutherland, F. L., Zaw, K., Meffre, S., Yui, T.-F., and Thu, K.: Advances in trace element "Fingerprinting" of gem corundum, ruby and sapphire, Mogok area, Myanmar, Minerals, 5, 61-79, 2015.
Thoresen, L. and Schmetzer, K.: Greek, Etruscan and Roman garnets in the antiquities collection of the J. Paul Getty Museum, J. Gemmol., 33, 201-222, 2013.
Van Long, P., Pardieu, V., and Giuliani, G.: Update on Gemstone Mining in Luc Yen, Vietnam, Gems Gemol., 49, 233-245, 2013.
Vanrillaer, L.: Un écrin sous-estimé au sein du Trésor de la cathédrale Saint-Aubin de Namur: le coffret des Saintes Épines, Analyses techniques, morphologiques et iconographiques accompagnées d'une typologie des coffrets, Mémoire de Master, Faculté de philosophie, arts et lettres, Université catholique de Louvain, 2017.
Van Tricht, F.: La gloire de l'empire : l'idée impériale de Henri de Flandre-Hainaut, deuxième empereur latin de Constantinople (1206-1216), Byzantion, 70, 211-241, 2000.
Wehrmeister, U., Jacob, D. E., Soldati, A. L., Hager, T., and Hofmeister,W.: Vaterite in freshwater cultured pearls from China and Japan, J. Gemmol., 31, 269-276, 2007.
Wodiska, J.: A Book of Precious Stones: The identification of gems and minerals, and an account of their scientific, commercial, artistic, and historical aspects, Putnam, New-York, USA, 370 pp., 1909.
Zwaan, P. C.: Sri Lanka: The gem island, Gems Gemol., 18, 62-71, 1982.
