"The currency's stable valuation and steady appreciation are encouraging investors to include more RMB products in their portfolios," Diana Cesar, head of retail banking and wealth management at HSBC in Hong Kong, wrote in an article earlier this month.

With the wider use of the RMB in international trade and investment activities, demand for RMB financial services from overseas individuals and corporations has increased gradually.

"This attracts overseas financial centers to promote their RMB business. There are now multiple offshore RMB centers around the world, including Hong Kong, London, Singapore and Taiwan," said a report titled "Offshore Renminbi Center" released on Dec 12 by the Research Office under the Legislative Council of Hong Kong.

Hong Kong, which started its offshore RMB business in February of 2004, is the first mover in offshore RMB business and the world's largest offshore RMB center.

In 2013, Singapore and Taiwan started their offshore RMB business. Singapore aims to serve ASEAN countries, and its RMB customer deposits had reached 140 billion yuan ($23 billion) by July of 2013. Taiwan is handling cross-Strait trade and financial transactions. Its RMB deposits rose to 123 billion yuan at the end of October.

In October, Hong Kong's RMB deposits saw their biggest rise since April 2011 to hit a record high of 781.6 billion yuan, according to the Hong Kong Monetary Authority.

The growth in offshore RMB deposits, especially in Hong Kong and Taiwan, helped the Standard Chartered Renminbi Globalization Index (RGI) to rise 2.4 percent to 1,220 in October from September, the banking multinational said in its latest index update.

The RGI, which stood at 809 in January of 2013, is an index that measures the internationalization of the offshore RMB across markets. The bank said it is the first industry benchmark to track the progress of RMB business activity.

Standard Chartered launched the RGI in November 2012. The RGI's base value is 100, set for Dec 31, 2010. The index now covers the top four markets in offshore RMB business: Hong Kong, London, Taiwan, and Singapore.

The index measures business growth in four key areas: deposits, bonds and certificate of deposits, trade settlement and other international payments, and foreign exchange.

As for cross-border RMB trade settlement, RMB settlements for trade of goods reached 4.05 trillion yuan in the first 11 months, the People's Bank of China (PBOC, central bank) said in a statement. It represented 17.2 percent of China's total trade in that period, higher than the 14.7 percent for the first half of this year.

As comparison, China's trade settled in RMB amounted to 506.3 billion yuan in 2010, 2.08 trillion yuan in 2011, and 2.94 trillion yuan for 2012.

Cross-border RMB transactions have been conducted in 220 countries and regions, said Xing Yujing, a senior PBOC official. In addition, China had signed currency swap agreements with 23 countries and regions by the end of September of this year.

In October, the PBOC and the European Central Bank signed a 350-billion-yuan currency swap agreement, bringing the volume of currency swap deals to 2.2 trillion yuan in total, according to Xing.