In a survey conducted on gold purity across 40 cities in the country, the average purity of gold was found to be 19.43 carat as opposed to 22 carat as claimed and in some cases the gold received in the capital was found to be as low as 16.32 carat. In the survey conducted during the ‘impure to pure exchange offer’ last year by Tanishq, the purity of gold was found to be lowest in northern city of Kanpur closely followed by Ranchi. The average caratage of gold in Kanpur was 17.02 while in Ranchi it was 17.95. Highest purity levels were found in Guwahati which reported a caratage of 20.5 per cent, a Tanishq release said. Among the metros, Kolkata saw a caratage of 19.71, Delhi 18.9, Mumbai 19.5, Bangalore 20 and Chennai 19.6.