Urbie bought that particular piece of kimberlite at the PDAC in Toronto from a collector. The kimberlite was from the Udachnaya pipe in Yakutia. <a href="http://petrology.oxfordjournals.org/cgi/content/full/49/4/823" rel="nofollow" target="_blank">http://petrology.oxfordjournals.org/cgi/content/full/49/4/823</a>