Hong Kong stocks fell 35.99 points, or 0.17 percent, to open at 20,622.12 on Tuesday.
The gold price in Hong Kong went down HK$112 to open at HK$16,300 per tael on Tuesday, according to the Chinese Gold and Silver Exchange Society.
The ChiNext Index, tracking China's Nasdaq-style board of growth enterprises, opened at 722.38 points on Tuesday, down 1.77 points from the previous close.
China's top banking regulator on Monday urged joint stock banks to watch their bottom lines and be wary of risks while supporting manufacturers and service providers.
China's stock index futures opened lower Tuesday, with the contract for settlement in September, the most actively traded, down 15.6 points to open at 2,261.6.
Chinese stocks opened lower Tuesday, with the benchmark Shanghai Composite Index opening at 2,069.34, down 0.44 percent.
The Chinese currency renminbi weakened 58 basis points to 6.3353 against the US dollar on Tuesday, ending a rise of the past four trading days, according to the China Foreign Exchange Trading System.
China's yuan retreated from a four-month high as concern domestic growth is slowing countered optimism the US latest stimulus measures will spur fund flows to emerging markets.
Steel reinforcement-bar futures in Shanghai dropped on concern that demand for the product used to strengthen concrete will falter.
Hong Kong's first deliverable yuan currency futures contract made its debut with the 415 contracts traded recording a total notional turnover of $41.5 million.
China's outstanding external debt increased by $34 billion in the second quarter to reach $785.17 billion by the end of June this year.
The gold price in Hong Kong closed flat at HK$16,412 per tael on Monday, according to the Chinese Gold and Silver Exchange Society.