UPDATE 1-Harry Winston gets $100 mln credit facility

* Says borrowing at interest margin of 3.5 pct

* Says facility has initial maturity date of June 24, 2013

* Says no scheduled repayments required before maturity

June 24 (Reuters) - Harry Winston Diamond Corp HW.TO said it completed a $100 million senior secured revolving credit facility with Standard Chartered Bank (STAN.L).

Harry Winston, which owns a minority stake in the Diavik diamond mine in Canada's Arctic and operates a string of high-end jewellery shops, said the borrowing will bear an interest margin of 3.5 percent.

The facility has an initial maturity date of June 24, 2013 with two one-year additional extensions at the company's option, and there are no scheduled repayments required before maturity, Harry Winston said.

Shares of the Toronto-based company, which is part-owned by Kinross Gold (K.TO), closed at C$13.53 Thursday on the Toronto Stock Exchange. (Reporting by Arnika Thakur in Bangalore; Editing by Don Sebastian)