One piece will be auctioned with no reserve—an unmounted purplish-red diamond that’s 0.73 carats (estimate: US$400,000 to US$600,000), despite its rarity as a red diamond.

A rare gem, named the Eternal Pink Diamond for its vivid purplish pink appearance, could sell for $35 million when Sotheby's auctions it off in June.

The most valuable of rubies tend to be an intense deep red in color, and may even be a slightly purplish red. Likewise, the clearer the stone—the fewer inclusions, or impurities—the more ...

Seven Old Masters, including one Fancy Red diamond; 32 exquisite single lots of pink and violet diamonds, including one Fancy Purplish Red diamond; and ...

The Red Flower ring, priced at $550,000, showcases a rare and exceptional 0.48ct Fancy Purplish Red Argyle radiant shaped diamond set among 2.70cts of pear-shaped white diamonds. The ring will go ...

A rare purplish-red diamond ring has sold for 2.97 million Swiss francs (1.27 million pounds), setting a world record for a red diamond, Christie's said.