The Qatari central bank has said it has sent a draft circular on new Basel III capital rules to the country's conventional and Islamic lenders, which includes requirements for issuance of instruments such as hybrid bonds, Reuters has reported. "This is a consultative circular. The final version is slated to be completed once a quantitative impact study (QIS) is undertaken for national banks," the central bank said. "The timeline for implementation etc. will be finalised only after the results of the QIS," it said, adding that the circular covered treatment of Tier 1 core and Tier 2 supplementary capital.