Titan Industries, the umbrella company behind the jewellery brand Tanishq amongst other lifestyle brands, is planning to increase its retail stores pan India by end of March next year. The expansion plans include setting up 150 new stores across various formats, with an investment of around Rs 170 crore. %% Reports say that a large part of the investment would be directed in setting up large format Tanishq stores. Besides Tanishq, the company retails watches and eyewear under Titan, Sonata, Xylys, Fastrack, Titan Eye brands, which will also be part of the expansion. %% At present, the company has a cumulative of over 560 retail stores pan India for its various brands.