India has produced a legacy of brave hearts since times immemorial. Probably there is not enough space to measure their sacrifices. However, we cannot close our eyes to those people who have made our country proud by excelling in their own fields and bringing us international recognition. Bharat Ratna is the highest civilian honour, given for exceptional service towards advancement of Art, Literature and Science, and in recognition of Public Service of the highest order. It is also not mandatory that Bharat Ratna be awarded every year.
The original specifications for the award called for a circular gold medal, 35 mm in diameter, with the sun and the Hindi legend "Bharat Ratna" above and a floral wreath below. The reverse was to carry the state emblem and motto. It was to be worn around the neck from a white ribbon. This design was altered after a year.
The provision of Bharat Ratna was introduced in 1954. The first ever Indian to receive this award was the famous scientist, Chandrasekhara Venkata Raman. Since then, many dignitaries, each a whiz in varied aspects of their career has received this coveted award.
In fact, our former President, Shri A. P. J Abdul Kalam is also a recipient of this esteemed honour (1997). There is no written provision that Bharat Ratna should be awarded to Indian citizens only. The award has been awarded to a naturalized Indian citizen, Agnes Gonxha Bojaxhiu, better known as Mother Teresa (1980) and to two non-Indians - Khan Abdul Ghaffar Khan and Nelson Mandela (1990). In 2009, the award was conferred on famous Indian vocalist Pandit Bhimsen Gururaj Joshi. Legendary cricketer Sachin Tendulkar and eminent scientist Prof. C.N.R. Rao have received the Bharat Ratna from President of India Shri Pranab Mukherjee on February 4, 2014, in New Delhi.
You can also view the complete list of Bharat Ratna Awardees
Source: India Book - A Reference Annual