(IDEX Online) - Lightbox is to sell bigger lab grown diamonds - up to two carats - at the same flat rate of $800 per carat.It is also introducing a premium lab grown range, called Finest, of stones guaranteed to be VVS clarity, colorless D, E, F with an excellent cut.Both moves suggest the De Beers company sees increasing potential in the lab grown sector.Last November it opened a $94m factory near Portland, Oregon, USA, capable of producing 200,000 carats a year.The industry was shocked back in 2018 when De Beers, which had enjoyed a near-monopoly of the mined diamond industry, announced that it would start manufacturing and selling lab-growns.Lightbox said in a press release that it would be offering pink, blue and white lab-grown diamonds in sizes up to and including two carats, for $800 per carat. The largest For example, a a two-carat round brilliant lab-grown diamond pendant will retail for $1,600 plus the cost of the setting.The new Finest range, of one-carat pink, blue and white stones will cost $1,500 per carat. All new offerings will be available on the Lightbox website from late October and via retail partners, both online and physically, from early next year.Pic shows Lightbox two-carat pink and blue diamond earrings in a halo setting.