BOSTON, MASS. — Among a strong representation of paintings and jewelry in Grogan’s June 21 auction was the top lot of the day — a platinum, onyx, turquoise and diamond sautoir, cataloged as “likely Boucheron” that went well over its high estimate of $4,000 to hammer for $70,000, totaling $84,000 including the buyer’s premium.

The piece actually had a very faint marking, but Lucy Grogan, who runs Grogan’s jewelry department, told Antiques and The Arts Weekly she deliberately downplayed the marking. “I wanted to let the bidders decide for themselves,” she said. And so they did.

The piece drew active bidding in the room, the Internet and the phones. The battle came down to two phone bidders, one of whom held on and succeeded. Several other jewelry lots also did quite well.

A complete report on the auction will appear in a future edition.