Dominion Diamond Customer Service Phone Numbers Customer service: +1.403.910.1933   Dominion Diamond Headquarters Info, Email, Phone number, Website and live chat Information The Dominion Diamond Headquarters is 900 – 606 4 Street SW Calgary, Alberta, T2P 1T1, Canada.   If you searching for Dominion Diamond Customer Service Number, you are at the right place. In this post, we have provided a list