The top lot of Bonhams New York auction is a fancy intense yellow diamond and diamond ring with an estimate of $350,000-$550,000BonhamsImportant fancy-colored diamonds, colorless diamonds, and colored gemstones from private collections will lead Bonhams’ Exceptional Jewels New York auction on June 8. Signed jewelry will also play a significant role in the sale, with pieces by Harry Winston, Chaumet, Bulgari, Graff, Tiffany & Co., Cartier, Van Cleef & Arpels, Oscar Heyman, Taffin and J.E. Caldwell.The auction will be held at Bonhams’ recently opened New York headquarters in Steinway Hall at the base of 111 West 57th Street.The top lot by estimate is an 18k white gold ring set with a cushion-shaped 32.20-carat fancy intense yellow diamond of VS2 clarity. The ring is pavé-set throughout with round brilliant-cut diamonds and carries an estimate of $350,000-$550,000. It comes from the collection of Glorya Kaufman, the Los Angeles philanthropist who established the USC Glorya Kaufman School of Dance and supported numerous arts initiatives. Kaufman died in 2005 at age 95.The second-highest estimated lot is a platinum ring centered with an 11.20-carat emerald-cut diamond of E color and VS1 clarity. The ring is estimated at $250,000-$350,000 and comes from the collection of Linda Dresner, the luxury retailer and fashion industry pioneer who died in April at age 88.A Harry Winston emerald and diamond ring with an estimate of $250,000-$350,000BonhamsAmong signed jewels and emeralds, a platinum Harry Winston ring featuring a 7.08-carat cushion-cut Colombian emerald flanked by tapered baguette-cut diamonds is expected to draw significant interest. From a private collection, it carries an estimate of $250,000-$350,000.MORE FOR YOUA faint pink diamond and diamond ring with an estimate of $180,000-$280,000BonhamsThe fourth-highest estimated lot is an 18k white and pink gold ring set with an 8.23-carat cushion-shaped internally flawless faint pink diamond. The center stone is flanked by trapezoid-shaped diamonds and accented with round brilliant-cut white and pink diamonds. The ring is estimated at $180,000-$280,000.Also estimated at $180,000-$280,000 is a pair of 18k white gold earrings featuring cushion-cut diamonds weighing 5.01 carats each. The diamonds are surrounded by round brilliant-cut diamonds and suspended from kite-shaped diamond surmounts.A ruby and diamond necklace with an estimate of $100,000-$150,000BonhamsBonhams is placing particular emphasis on its colored gemstone offerings. The auction house is promoting as a key highlight a necklace centered on a 5.02-carat oval-shaped unheated Burmese ruby. The ruby is surrounded by alternating baguette-cut and round brilliant-cut diamonds and suspended from a graduated diamond necklace of similar design. The necklace, which contains an estimated 39 carats of diamonds, is expected to realize $100,000-$150,000.Two notable colored gemstone lots from the Glorya Kaufman collection rank among the sale's top offerings.A Paraiba-type tourmaline with an estimate of $150,000-$250,000BonhamsThe first is a necklace featuring a 30.61-carat oval-shaped Paraíba-type tourmaline of Mozambique origin mounted in a 14k gold hexagonal frame and suspended from a gold link chain. It is estimated at $150,000-$250,000.A J.E. Caldwell multicolor sapphire, zircon and diamond necklace with an estimate of $150,000-$250,000BonhamsThe second is a platinum J.E. Caldwell necklace set with step-cut multicolored sapphires and a step-cut zircon accented by marquise-shaped and round brilliant-cut diamonds. The four largest sapphires are accompanied by AGL reports stating they are of Sri Lankan origin, with three showing no evidence of heat treatment. Total sapphire weight is estimated at 100 to 120 carats, while total diamond weight is estimated at 5.60 carats. The necklace carries an estimate of $150,000-$250,000.A Bulgari multicolored sapphire and diamond necklace with an estimate of $125,000-$225,000BonhamsAnother notable colored gemstone piece is a Bulgari necklace estimated at $125,000-$225,000. The design features oval-shaped multicolored sapphires interspersed with pairs of round brilliant-cut diamonds and suspends a detachable pendant centered on a 24.10-carat pear-shaped yellow sapphire of Sri Lankan origin.