Opal Takes Center Stage in October Birthstone Jewelry from Tiffany, Dior, Cartier, and More

Key facts

• October has multiple birthstones: opal and pink tourmaline, with opal most firmly identified with the month.
• Opals rate 5.5 to 6 on the Mohs scale, scratch easily, and are porous, requiring caution in rings and bracelets.
• Tiffany & Co.'s Paradise Bird Unenhanced Boulder Opal Brooch appeared in the summer Tiffany Blue Book Hidden Garden collection, reworking Jean Schlumberger's Bird on a Rock in platinum and gold.
• Dior's Diorissima High Jewelry Opal Ring, developed by Victoire de Castellane and the Dior workshops, was released to the public on September 28.
• Margot McKinney's Blue Lagoon Australian Opal Cuff is 18-karat brushed white gold with a nearly 58-carat Australian boulder opal center, surrounded by turquoise, diamonds, blue sapphires, tsavorites, and peridots.
• Rolex's Oyster Perpetual Day-Date 36 in white gold and diamonds uses a milky pink opal dial slice behind 10 diamond-encrusted Roman numerals, with a white diamond brilliant bezel.
• Cartier's Lagoon bracelet centers on an 85-carat-plus oval cabochon black opal framed by sapphire beads, emerald beads, and Paraiba tourmalines.
• Noor Fares' Eclipse Black Opal Pendant frames a 4.20-carat black opal doublet with pavé diamonds in 18-karat grey gold, with matching earrings.