JAPANESE GEMS: Van Cleef & Arpels this month will stage a retrospective exhibition in Tokyo, offering an overview of more than 250 pieces selected from the jeweler’s own bounty, as well as private collections. The exhibition will be held at the Mori Arts Center in Tokyo’s Roppongi from Oct. 30 to Jan. 17. Key pieces include a tiara worn by Princess Grace of Monaco, Etruscan-inspired gold bracelets owned by Jacqueline Kennedy Onassis as well as a ruby-and-diamond bracelet commissioned by Marlene Dietrich. The collection is expected to travel subsequently to Beijing, New York and Paris. The jewelry house is also publishing a glossy volume later this month, “The Poetry of Time,” showcasing a selection of its high-end timepieces.