MOUNT KISCO, N.Y. – The holidays are the time to bring out the boldest, most colorful, and most sparkly pieces of jewelry. The Benefit Shop Foundation stands ready to help you improve your jewelry box with its December 6 Specialty Estate Jewelry Auction, which, as the sale’s title indicates, will take place on Wednesday, December 6. Absentee and Internet live bidding will be available through LiveAuctioneers.

Among the auction’s 720 lots are 35 pieces by Schreiner, the famed American costume jewelry company that was active between 1951 and 1975. A standout among standouts is a signed Schreiner pink crystal brooch featuring the firm’s coveted ruffle design, which features kite-shaped crystals overlapping and radiating from a central gem. The example in the Benefit Shop Foundation sale has an estimate of $100-$300, but as of November 17, a total of 12 bids had already pushed it to $400, with 77 bidders watching the lot.

Other vintage signed Schreiner pieces commanding the attention of dozens of bidders well before the December 6 sale date include a visually striking brooch in orange and green art glass with seed pearls, estimated at $100-$250; a pink and blue crystal brooch with a central green cabochon, estimated at $100-$300; and a gold-tone brooch with crystal decoration and a trio of yellow cabochons that is also estimated at $100-$300.