ALROSA announced that it had the recovered several large rough diamonds from the Jubilee (Yubileynaya) pipe at its Aikhal Mining and Processing Division in October. The gem-quality diamonds range from 82 to 163 carats and all three have yellow tints.
The smallest is an 82.82-carat octahedron, the second weighs 108.34 carats, while the largest is a 163.11-carat stone.
“The simultaneous extraction of three large rough diamonds, two of which are over 100 carats, within such a short period of time is a one-off event especially when it comes to gem-quality diamonds. As a rule, only 5 to 10 stones over 100 carats may be recovered within a year, and they are always in great demand at auctions. The rough diamonds will be delivered to the United Selling Organisation (USO) ALROSA, where our experts will give them a detailed assessment," observed USO Director Evgeny Agureev.
The Jubilee pipe was discovered in 1975 and ranks among the largest primary diamond deposits both in Yakutia and abroad. Over the first nine months of this year, the pipe has produced 6.57 million carats of rough diamonds — some 22 percent of ALROSA's total diamond output.
The Jubilee pipe is traditionally ALROSA's leader in the recovery of large diamonds.Twenty rough diamonds over 50 carats have been extracted from Jubilee since the beginning of 2017. Unique names are often given to the facts of recovery of such stones. A 51.91-carat rough diamond that was recovered from the pipe earlier this year was named "Russian Ambassador Andrey Karlov".