** Australian gold stocks .AXGD fall as much as 4.6% to their lowest point since March 30, tracking easing bullion prices
** Gold prices nudge lower as rising Treasury yields and a firm dollar outweigh optimism over a potential U.S.-Iran peace agreement GOL/
** Evolution Mining EVN.AX sheds as much as 5.3% to fall to a 5-month low; Northern Star Resources NST.AX loses 3%
** Broader market .AXJO down 1.1%
** YTD, sub-index's ~16% loss compares with the benchmark's 2.4% loss
(Reporting by Shruti Agarwal in Bengaluru)
((Shruti.Agarwal@thomsonreuters.com;))