markets regulator SEBI to raise Rs 4,000 crore ($480 mn) through an initial public offering (IPO).
The offer comprises fresh issue of shares worth Rs 1,250 crore and offer-for-sale shares worth Rs 2,750 crore.
The proposed IPO is likely to value IGI at about $3.5 -4 billion.
Blackstone acquired IGI from Shanghai Yuyuan Tourist Mart (Group) — a subsidiary of Fosun, and Roland Lorie — who belongs to the founding family, for $570 million in May last year.
Founded in 1975 in Antwerp, IGI is a global leader in independent certification of diamonds, gemstones, and jewelry, with a global footprint of 29 laboratories and 18 schools of gemology across 10 countries.
Blackstone also plans a Rs 5,000-crore IPO of Aadhar Housing Finance and filed DRHP with the market regulator SEBI.