Help
Chicago Corporate Office:
122 S.Michigan Avenue Suite 800
Chicago, IL 60603
(312) 922-3800
Customer Service:
For web and phone customer service, please email customerservice@ultradiamonds.com or call us at (877) 858-7201
Customer service Hours:
Monday - Friday, 10 AM to 4 PM (CST); CLOSED on Saturdays/Sundays and National Holidays.
