Corundum Source Types

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GIA Identification and Origin Reports for ruby and sapphire include an opinion on the geographic origin of the stone, if determinable. The chart below and the downloadable PDF include more information about corundum sources and GIA’s source type classification system, detailing the relationship between source type and geographic origin.

Map and chart with information about corundum sources


This information was included with GIA Corundum Reports (now GIA Identification and Origin Reports for ruby and sapphire reports) until March 2013.