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The Chalmer 's Topaz is a topaz gem weighting 5,899.5 - carats located in Chicago , Illinois ' Grainger Hall of Gems , in the Field Museum of Natural History .
 Chicago , Illinois
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chicago , Illinois