International Gemological Institute (IGI), India branch has tied up with Nu Age Technologies, a New York-based diamond colouring laboratory, to offer colour enhancement services for diamonds in India.$$IGI would alsio certify these diamonds.%%The treated stones would be available in a range of fancy colours such as blue, canary, gold, green, pink, purple, cognac, reddish cognac, ice blue, blue-green and black. %%The same diamond can also be re-treated and given another colour.