For the first time in Russia, the Alrosa company mined a gem-quality blue diamond. A unique crystal weighing 2.74 carats was found from the Nakin kimberlite field in Kotia, the company reported. For the first time in decades, experts have come across a type IIb blue diamond, one of the rarest and most expensive stones on Earth, whose color is due to the presence of boron. Now the cutting of the stone is finished, its presentation is planned for the end of November.

For the first time in Russia, the Alrosa company mined a gem-quality blue diamond. A unique crystal weighing 2.74 carats was found from the Nakin kimberlite field in Kotia, the company reported. For the first time in decades, experts have come across a type IIb blue diamond, one of the rarest and most expensive stones on Earth, whose color is due to the presence of boron. Now the cutting of the stone is finished, its presentation is planned for the end of November.