How a 910ct. Rough Became a Sparkling Van Cleef Collection

RAPAPORT... The Baselworld fair has received much criticism in recent years, but one of the final shows before its public implosion appears to have facilitated a diamond deal that counts among the biggest in history.

Antwerp-based manufacturers Taché and Samir Gems came to the March 2018 exhibition with the exquisite Lesotho Legend, a 910-carat, type IIa diamond they had bought togethe...