Diana Tea Company Limited (DTCL) is a century old company, registered in the year 1911. The company was run by Nawab Gulam Jabbar & Family till 1976. DTCL was engaged in cultivation and manufacture of tea from its only one garden i.e. Diana Tea Estate. Aares Group took over Diana Tea Estate in the year 1976 and elevated its production from a meagre 2.5 lakh kgs. per annum to a staggering capacity of 10 lakh kgs. per annum.

The then AARES group Chairman, Late Shri Radheshyam Singhania, was a visionary tea lover. He was determined to make this loss making garden into one of the best gardens in that region and he diligently focused on field development and up-gradation of field practices, to make the tea estate as one of the best gardens in Dooars region of West Bengal in respect of quality, quantity and best maintained garden. Presently the total annual production of Diana Tea Estate stands at around 10 Lakh kgs.

During the year 2010 Diana won the prestigious award for manufacturing quality C.T.C tea contacted by CII and Diana Tea Garden was selected as the "queen of Dooars" amongst more than 150 tea gardens of Dooars and Terai.

In the year 1994 the management of the Company decided to share ts success with public and accordingly made an initial public issue of its equity shares at a premium of Rs. 55/- per share which was oversubscribed 2.5 times and listed in four major stock exchanges of the country namely Mumbai, Kolkata, New Delhi and Ahmedabad.

Aares Group added more feathers on its caps by acquiring Baintgoorie Tea Estate in the year 1983 from Duncans Agro Industries Ltd. and Goodhope Tea Estate from Bazaloni Group (B.C. Jindal) in the year 1997. DTCL now produces 3.54 million kgs black tea annually from its three estates - i.e. Diana, Baintgoorie and Goodhope Tea Estates.

The Company intends to grow in the plantation business through consolidation and modernization of its existing tea plantation by enabling it to reach to the highest level of economic viability. The Company also intends to go for the expansion of its plantation business inorganically by acquisition of other tea estates domestically or internationally. The Company also wants to en-cash its goodwill and brand by launching various value added products in the Indian market. The ultimate goal of the company is to become an "one stop shop for anything related to tea".