Get latest articles and stories on Business at LatestLY. The International Gemological Institute-IGI, graded three lab grown diamonds of 27.27carat, 20.24 carat and 15.16 carats grown at Greenlab Diamonds LLP as a part of their project towards "sustainable and affordable luxury." Business News | IGI Grades 3 Exquisite Lab Grown Creations for Greenlab's Sustainable Project.