Gold suffered the steepest single day fall by plunging 1,540 rupees to 25,800 rupees per 10 gm in the opening trade in Delhi on Monday on panic selling by stockists after a meltdown in global bullion markets.In Asia, the metal tumbled about 124 US Dollars, followed by over 100 Dollars in the previous session, as equities and other commodities fell on speculation that European governments will struggle to contain the euro zone's debt crisis, threatening global growth.Back home, silver dropped by 3,200 rupees to 50,800 rupees per kg as the metal in overseas markets recorded its worst two-day drop in 31 years. Silver in Delhi had lost 10,500 rupees in last two sessions.