Exceptional pink to red diamonds: A celebration of the 30th argyle diamond tender

Abstract

Over the past three decades, more than one thousand pink diamonds from Rio Tinto's Argyle mine in Western Australia have been offered for sale at annual invitation-only events known as tenders. These diamonds, selected from the mine's large annual production of rough, are cut and polished at the company's factory in Perth for the tenders. These diamonds have all been graded by GIA, as their color grade is a crucial value consideration. This article summarizes each year's collection and presents some pertinent statistical information on color grade and description for this important group of rare colored diamonds.