139769
6 August 2009 at 4.40 pm , two sharply dressed men arrived at the Graff Diamonds jewelry store by taxi and once inside produced two handguns which they used to threaten staff .
 Graff
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Graff