Fine Estate Jewelry & Collectables
Tue, Aug 18, 2026 11:45AM EDT
Lot 285
OSTERTAG Paris 1930 Art Deco Pendant Brooch Platinum 20.24 Ctw Diamonds & Emeralds
Estimate: $40,000 - $60,000
Bid Increments
| Price | Bid Increment |
|---|---|
| $0 | $25 |
| $500 | $50 |
| $1,000 | $100 |
| $2,000 | $200 |
| $5,000 | $500 |
| $10,000 | $1,000 |
Exceptionally rare Ostertag convertible jewel, France, circa 1920s, showcasing innovative period engineering. Crafted in platinum (French hallmarked) with superb French pavé and millegrain work. Set with an extraordinary diamond suite: 26 larger European rose-cut diamonds totaling approx. 9.30 ctw (mixed F/G/H and K/L colors, VS/SI) plus 148 graduated smaller European rose/round-cut diamonds totaling approx. 7.56 ctw (G/H color, VS/SI). Centered with a millegrain bezel-set cornered emerald-cut Colombian emerald (8.5 x 5 x 4mm; approx. 1.23 ct) and framed by 14 calibre-cut Colombian emeralds in millegrain bezels totaling approx. 2.15 ctw. Weight 30.95 grams; measures 66 x 40 x 10mm. French marks including maker “RF,” platinum hallmarks, and signed “OSTERTAG FRANCE”.
Very good conditions. All our diamonds and colored gemstones are naturally earth-mined. Any synthetic (lab-grown) stones will be clearly indicated in the description. Upon Request, Auction House may provide an appraisal. This will carry an additional cost. Appraisals are made by our in house GIA certified Gemologist.
Condition
Available payment options
Winbids Auctions manage their own shippings, UPS & Fedex. Once buyer receives invoice it will be presented with the shipping cost. If buyer chooses to pay, the auction house will arrange the shipping with a 2-day delivery insured package. This is optional, buyer can also provide auction house with a label or arrange for a pick up. Winning bidders can pick up their won lots at our location. Please bring a photo ID and a copy of your invoice. Please note that taxes will be charged upon pick up unless a valid resale certificate for the business matching the invoice is presented. Buyers are responsible for paying Shipping cost.