Christie’s New York, June 16 – 30

For this season’s online jewelry auctions, Christie’s has a summer cooler of epic proportions: a 28.86-carat diamond ring. Its bona fides are everything a truly distinguished diamond should have and every diamond connoisseur would want. The elegant emerald cut is a magnificent platform for showing off this D color, VVS1 clarity, Type IIA diamond. It is also the highest valued lot ever to be offered online by the house, with an estimate of $1,000,000–2,000,000. This is a diamond of rare quality.

For those who garden, there’s an enchanting Van Cleef & Arpels Rose de Noel floral brooch, the heart-shaped leaves in green chrysoprase and trimmed in gold, as well as a Graff “Classic Butterfly” ladies watch—pink sapphire butterflies airborne on diamond clouds.