Upcoming Auctions Auctions Near Me How Auctions Work

|

Help Consign Price Results

Explore Categories

Art
Drawings
Mixed Media & Collages
Paintings
Photography
Prints & Multiples
Scrolls, Screens & Fan Paintings
Sculptures
Statues & Statuettes
Artists
Andy Warhol
Banksy
Francis Bacon
Frank Stella
Jean-Michel Basquiat
Keith Haring
Pablo Picasso
Roy Lichtenstein
Popular Searches
Bronze Statues
Folk Art
Lithographs
Oil Paintings
Pencil Drawings
Portraits
Browse by Origin
African
American
Ancient Egyptian
Ancient Greek and Roman
Asian
Catholic
Egyptian
European
Middle Eastern
Oceanic/Pacific Rim

Jewelry
Bracelets
Brooches & Pins
Cufflinks, Tie Pins & Tie Clips
Earrings
Loose Stones & Beads
Necklaces & Pendants
Rings
Watches
Featured
Bulgari
Bulova
Cartier
Chanel
Chopard
Omega
Patek Philippe
Rolex
Swarovski
Tiffany & Co.
Van Cleef & Arpels
Popular Searches
18K Gold Jewelry
Diamond Jewelry
Emeralds
Pearls
Rubies
Sapphires
Jewelry- Silver, Gold, Gemstones NO RESERVES
Pangaea Auctions
Sponsored.Your ad here?

Asian Antiques
Art
Collectibles
Fashion
Furniture
Jewelry
Tableware & Barware
Vases & Garnitures
Browse By Origin
Chinese Antiques
Indian Antiques
Japanese Antiques
Korean Antiques
Persian Antiques
Southeast Asian Antiques
Tibetan Antiques
Featured
Bronze
Cloisonne
Han Dynasty
Jade Jewelry
Ming Dynasty
Porcelain
Qing Dynasty
Woodblock Prints

Furniture
Beds & Headboards
Cabinets & Storage
Seating
Tables
Tables
Coffee & Cocktail Tables
Desks & Writing Tables
Dining Tables
Seating
Benches
Chairs
Sofas & Settees
Cabinets & Storage
Armoires & Wardrobes
Bookcases, Display Cases & Shelves
Buffets, Sideboards & Credenzas
Dressers & Chests of Drawers
Browse By Styles
Art Deco
Chippendale
Federal Style
Hollywood Regency
Mid-Century Modern
Mission Style
Queen Anne
Rococo
Victorian
Featured
Eames Chairs
George Nelson
Hans Wegner
Herman Miller
Milo Baughman
Paul Evans
Stickley

Collectibles
Advertisements & Signs
Automobilia & Petroliana
Banks, Registers & Vending Machines
Books, Magazines & Papers
Breweriana & Beer Collectibles
Cameras & Photo Equipment
Coins, Currency & Stamps
Figurines & Miniatures

Desk Accessories
Hardware
Hunting & Fishing
Maps & Atlases
Musical Instruments
Radios, Phones & Electronics
Railroad Collectibles
Religious & Spiritual Objects
Rocks, Minerals & Fossils

Scientific & Medical Objects
Tobacciana
Toys & Hobbies
Vanity, Perfume & Grooming
Weapons & Armor
Wine & Spirits

Coins
Bills & Currency Notes
Bullion
Coins
Exonumia
Stamps
Stocks, Bonds & Bank Certificates
Browse By Origin
African
American
Ancient Greek and Roman
Asian
Byzantine
Egyptian
European
Middle Eastern
Oceanic/Pacific Rim
Featured Coins
Commemoratives
Dollars & Half Dollars
Gold Coins
Half-Dimes and Dimes
Nickels
Proof Sets
Quarters

Home & Décor
Candle Holders
Clocks
Decorative Baskets
Fireplaces & Mantels
Fireplace Accessories
Garden Ornaments & Accents
Kitchenware
Lighting
Outdoor & Patio Furniture
Picture Frames

Coat Racks & Umbrella Stands
Magazine Racks
Mirrors
Planters, Cachepots & Jardinieres
Rugs & Carpets
Tableware & Barware
Textiles & Linens
Vases & Vessels
Featured
Art Glass
Baccarat
KPM
Lalique
Limoges
Meissen
Murano
Rookwood
Sèvres
Tiffany Studios

Clothing
Dresses & Gowns
Jackets & Coats
Pants & Trousers
Robes & Kimonos
Shirts & Blouses
Skirts
Suits & Ensembles
Sweaters
Vests
Accessories
Bags & Purses
Belts & Chatelaines
Canes & Walking Sticks
Eyeglasses & Spectacles
Neckties, Bowties & Bolo Ties
Pocket Squares
Scarves, Wraps & Shawls
Shoes
Wallets & Money Clips
Featured Designers
Chanel
Chloe
Christian Dior
Gucci
Hermes
Louis Vuitton
Michael Kors
Yves Saint Laurent

Necklaces & Pendants

8 CT Blue Topaz and Diamond Elegance Suite First Image

#image-loader-main { display: none; }

8 CT Blue Topaz and Diamond Elegance Suite First Image

8 CT Blue Topaz and Diamond Elegance Suite

Total Sales6 Sold

Median Sale Price

Sale Price Range

You May Also Like

AN EXQUISTE VINTAGE TIGER'S EYE NECKLACE 8 STRAND AND EARRINGS JAY KING (1 of 3)

AN EXQUISTE VINTAGE TIGER'S EYE NECKLACE 8 STRAND AND EARRINGS JAY KING

Noble House Collection Gallery

See Sold Price

Feb 28, 2024

A FABULOUS VINTAGE LAPIS LAZULI NECKLACE BY JAY KING DESERT ROSE 18" (1 of 3)

A FABULOUS VINTAGE LAPIS LAZULI NECKLACE BY JAY KING DESERT ROSE 18"

Noble House Collection Gallery

See Sold Price

Feb 28, 2024

SUPERB VINTAGE NECKLACE NATURAL STONE TURQUOISE STERLING 16" (1 of 3)

SUPERB VINTAGE NECKLACE NATURAL STONE TURQUOISE STERLING 16"

Noble House Collection Gallery

See Sold Price

Feb 28, 2024

BEAUTIFUL VINTAGE NATIVE AMERICAN SOUTHWESTERN NECKLACE EARRINGS STERLING (1 of 4)

BEAUTIFUL VINTAGE NATIVE AMERICAN SOUTHWESTERN NECKLACE EARRINGS STERLING

Noble House Collection Gallery

See Sold Price

Feb 28, 2024

SUPERB LOT OF 3 AMBER NECKLACES 80gr (1 of 3)

SUPERB LOT OF 3 AMBER NECKLACES 80gr

Noble House Collection Gallery

See Sold Price

Feb 28, 2024

Chinese Green Jade Necklace (1 of 12)

Chinese Green Jade Necklace

Schmidt's Antiques Inc. Since 1911

See Sold Price

Mar 02, 2024

A FABULOUS VINTAGE SOUTHWESTERN NATIVE AMERICAN NECKLACE AMBER TURQUOISE STERLING (1 of 4)

A FABULOUS VINTAGE SOUTHWESTERN NATIVE AMERICAN NECKLACE AMBER TURQUOISE STERLING

Noble House Collection Gallery

See Sold Price

Feb 28, 2024

A SUPERB NATURAL ANTIQUE CORAL NECKLACE 19" 44gr (1 of 3)

A SUPERB NATURAL ANTIQUE CORAL NECKLACE 19" 44gr

Noble House Collection Gallery

See Sold Price

Feb 28, 2024

A GENUINE BALTIC AMBER BUTTERSCOTCH NECKLACE 20" 37gr (1 of 3)

A GENUINE BALTIC AMBER BUTTERSCOTCH NECKLACE 20" 37gr

Noble House Collection Gallery

See Sold Price

Feb 28, 2024

A FANTASTIC LARGE BALTIC AMBER NECKLACE 27" 111gr (1 of 3)

A FANTASTIC LARGE BALTIC AMBER NECKLACE 27" 111gr

Noble House Collection Gallery

See Sold Price

Feb 28, 2024

A WONDERFUL ANTIQUE FACETED AMBER NECKLACE 26" 42gr (1 of 4)

A WONDERFUL ANTIQUE FACETED AMBER NECKLACE 26" 42gr

Noble House Collection Gallery

See Sold Price

Feb 28, 2024

Large Antique 19th C Ottoman Diamond 14K Gold Drop Necklace (1 of 20)

Large Antique 19th C Ottoman Diamond 14K Gold Drop Necklace

Kavanagh Auctions

See Sold Price

Feb 24, 2024

BEAUTIFUL LOT OF 2 AMBER NECKLACES 36gr (1 of 3)

BEAUTIFUL LOT OF 2 AMBER NECKLACES 36gr

Noble House Collection Gallery

See Sold Price

Feb 28, 2024

Chinese Jade 18k Gold Pendant on 14k Gold Necklace (1 of 7)

Chinese Jade 18k Gold Pendant on 14k Gold Necklace

Hill Auction Gallery

See Sold Price

Feb 28, 2024

A BEAUTIFUL SOUTHWESTERN LOT OF 3 PIECES TURQUOISE SILVER INLAID (1 of 2)

A BEAUTIFUL SOUTHWESTERN LOT OF 3 PIECES TURQUOISE SILVER INLAID

Noble House Collection Gallery

See Sold Price

Feb 28, 2024

A BEAUTIFUL CORAL NECKLACE 2 STRAND 16" 43gr (1 of 4)

A BEAUTIFUL CORAL NECKLACE 2 STRAND 16" 43gr

Noble House Collection Gallery

See Sold Price

Feb 28, 2024

Similar Sale History

Unlock All Prices

Sold

8 CT Blue Topaz and Diamond Elegance Suite (1 of 1)

8 CT Blue Topaz and Diamond Elegance Suite Master jewelers designed your necklace with 1 piece of GENUINE 7X4mm faceted Blue Topaz. 6 pieces of GENUINE 3.5X3.5mm faceted Blue Topaz. 8 pieces of GENUINE 3X3mm faceted round diamonds. 16.8 grams

See Sold Price

Sold

8 CT Blue Topaz and Diamond Elegance Suite (1 of 1)

8 CT Blue Topaz and Diamond Elegance Suite Master jewelers designed your necklace with 1 piece of GENUINE 7X4mm faceted Blue Topaz. 6 pieces of GENUINE 3.5X3.5mm faceted Blue Topaz. 8 pieces of GENUINE 3X3mm faceted round diamonds. 16.8 grams

See Sold Price

Sold

8 CT Blue Topaz and Diamond Elegance Suite (1 of 1)

8 CT Blue Topaz and Diamond Elegance Suite Master jewelers designed your necklace with 1 piece of GENUINE 7X4mm faceted Blue Topaz. 6 pieces of GENUINE 3.5X3.5mm faceted Blue Topaz. 8 pieces of GENUINE 3X3mm faceted round diamonds. 16.8 grams

See Sold Price

Sold

8 CT Blue Topaz and Diamond Elegance Suite (1 of 1)

8 CT Blue Topaz and Diamond Elegance Suite Master jewelers designed your necklace with 1 piece of GENUINE 7X4mm faceted Blue Topaz. 6 pieces of GENUINE 3.5X3.5mm faceted Blue Topaz. 8 pieces of GENUINE 3X3mm faceted round diamonds. 16.8 grams

See Sold Price

Sold

8 CT Blue Topaz and Diamond Elegance Suite (1 of 1)

8 CT Blue Topaz and Diamond Elegance Suite Master jewelers designed your necklace with 1 piece of GENUINE 7X4mm faceted Blue Topaz. 6 pieces of GENUINE 3.5X3.5mm faceted Blue Topaz. 8 pieces of GENUINE 3X3mm faceted round diamonds. 16.8 grams

See Sold Price

Sold

8 CT Blue Topaz and Diamond Elegance Suite (1 of 1)

8 CT Blue Topaz and Diamond Elegance Suite Master jewelers designed your necklace with 1 piece of GENUINE 7X4mm faceted Blue Topaz. 6 pieces of GENUINE 3.5X3.5mm faceted Blue Topaz. 8 pieces of GENUINE 3X3mm faceted round diamonds. 16.8 grams

See Sold Price

Sold

7 CT Blue Topaz and Diamond Elegance Necklace (1 of 1)

7 CT Blue Topaz and Diamond Elegance Necklace Master jewelers designed your necklace with 1 piece of GENUINE 7X4mm faceted Blue Topaz. 6 pieces of GENUINE 3.5X3.5mm faceted Blue Topaz. 8 pieces of GENUINE 3X3mm faceted round diamonds. 16.8 grams

See Sold Price

Sold

7 CT Blue Topaz and Diamond Elegance Necklace (1 of 1)

7 CT Blue Topaz and Diamond Elegance Necklace Master jewelers designed your necklace with 1 piece of GENUINE 7X4mm faceted Blue Topaz. 6 pieces of GENUINE 3.5X3.5mm faceted Blue Topaz. 8 pieces of GENUINE 3X3mm faceted round diamonds. 16.8 grams

See Sold Price

Sold

7 CT Blue Topaz and Diamond Elegance Necklace (1 of 1)

7 CT Blue Topaz and Diamond Elegance Necklace Master jewelers designed your necklace with 1 piece of GENUINE 7X4mm faceted Blue Topaz. 6 pieces of GENUINE 3.5X3.5mm faceted Blue Topaz. 8 pieces of GENUINE 3X3mm faceted round diamonds. 16.8 grams

See Sold Price

8 CT Blue Topaz Diamond Earrings Appraised $2,880 (1 of 2)

8 CT Blue Topaz Diamond Earrings Appraised $2,880 Gem: Blue Topaz. Weight: 8.0 ctw, Clarity: VS1, Color: Swiss Blue Gem: Diamond. Weight: 0.15 ctw, Clarity: SI3, Color: I-J

See Sold Price

Sold

8 CT Blue Topaz Diamond Earrings Appraised $2,880 (1 of 2)

8 CT Blue Topaz Diamond Earrings Appraised $2,880 Gem: Blue Topaz. Weight: 8.0 ctw, Clarity: VS1, Color: Swiss Blue Gem: Diamond. Weight: 0.15 ctw, Clarity: SI3, Color: I-J

See Sold Price

Sold

8 CT Blue Topaz Diamond Earrings Appraised $2,880 (1 of 2)

8 CT Blue Topaz Diamond Earrings Appraised $2,880 Gem: Blue Topaz. Weight: 8.0 ctw, Clarity: VS1, Color: Swiss Blue Gem: Diamond. Weight: 0.15 ctw, Clarity: SI3, Color: I-J

See Sold Price

Sold

8 CT Blue Topaz Diamond Earrings Appraised $2,880 (1 of 2)

8 CT Blue Topaz Diamond Earrings Appraised $2,880 Gem: Blue Topaz. Weight: 8.0 ctw, Clarity: VS1, Color: Swiss Blue Gem: Diamond. Weight: 0.15 ctw, Clarity: SI3, Color: I-J

See Sold Price

Sold

8CT BLUE TOPAZ & DIAMOND PENDANT 14K GOLD BOAT (1 of 2)

8CT BLUE TOPAZ & DIAMOND PENDANT 14K GOLD BOAT 14K YELLOW GOLD SAILBOAT NECKLACE PENDANT MEASURES 1-3/4"

See Sold Price

Sold

8.6 CT Blue Topaz Diamond Seduction Suite (1 of 1)

8.6 CT Blue Topaz Diamond Seduction Suite Master jewelers designed your pendant with 1 piece of GENUINE 14X10mm faceted oval blue topaz. 16 pieces of GENUINE single cut diamonds .22 carat tw. 3.3 grams of sterling silver layered with 18K Gold

See Sold Price

Sold

8.6 CT Blue Topaz Diamond Seduction Suite (1 of 1)

8.6 CT Blue Topaz Diamond Seduction Suite Master jewelers designed your pendant with 1 piece of GENUINE 14X10mm faceted oval blue topaz. 16 pieces of GENUINE single cut diamonds .22 carat tw. 3.3 grams of sterling silver layered with 18K Gold

See Sold Price

Sold

8.6 CT Blue Topaz Diamond Seduction Suite (1 of 1)

8.6 CT Blue Topaz Diamond Seduction Suite Master jewelers designed your pendant with 1 piece of GENUINE 14X10mm faceted oval blue topaz. 16 pieces of GENUINE single cut diamonds .22 carat tw. 3.3 grams of sterling silver layered with 18K Gold

See Sold Price

Sold

8.6 CT Blue Topaz Diamond Seduction Suite (1 of 1)

8.6 CT Blue Topaz Diamond Seduction Suite Master jewelers designed your pendant with 1 piece of GENUINE 14X10mm faceted oval blue topaz. 16 pieces of GENUINE single cut diamonds .22 carat tw. 3.3 grams of sterling silver layered with 18K Gold

See Sold Price

Sold

8.6 CT Blue Topaz Diamond Seduction Suite (1 of 1)

8.6 CT Blue Topaz Diamond Seduction Suite Master jewelers designed your pendant with 1 piece of GENUINE 14X10mm faceted oval blue topaz. 16 pieces of GENUINE single cut diamonds .22 carat tw. 3.3 grams of sterling silver layered with 18K Gold

See Sold Price

Sold

090031: BLUE TOPAZ, DIAMOND, SAPPHIRE & GOLD RING (1 of 1)

090031: BLUE TOPAZ, DIAMOND, SAPPHIRE & GOLD RING 8.82 CT BLUE TOPAZ, DIAMOND, SAPPHIRE AND 18 KT WHITE GOLD RING:diamond wt. 0.22 ct.; sapphire wt. 0.63 ct.

See Sold Price

Sold

8 CT Emerald and Diamond Elegance Suite (1 of 1)

8 CT Emerald and Diamond Elegance Suite Master jewelers designed your necklace with 1 piece of GENUINE 7X4mm faceted emerald. 6 pieces of GENUINE 3.5X3.5mm faceted emerald. 8 pieces of GENUINE 3X3mm faceted round diamonds. 16.8 grams of ste

See Sold Price

Sold

8 CT Emerald and Diamond Elegance Suite (1 of 1)

8 CT Emerald and Diamond Elegance Suite Master jewelers designed your necklace with 1 piece of GENUINE 7X4mm faceted emerald. 6 pieces of GENUINE 3.5X3.5mm faceted emerald. 8 pieces of GENUINE 3X3mm faceted round diamonds. 16.8 grams of ste

See Sold Price

Sold

8 CT Sapphire and Diamond Elegance Suite (1 of 1)

8 CT Sapphire and Diamond Elegance Suite Master jewelers designed your necklace with 1 piece of GENUINE 7X4mm faceted sapphire. 6 pieces of GENUINE 3.5X3.5mm faceted sapphire. 8 pieces of GENUINE 3X3mm faceted round diamonds. 16.8 grams of s

See Sold Price

Sold

8 CT Sapphire and Diamond Elegance Suite (1 of 1)

8 CT Sapphire and Diamond Elegance Suite Master jewelers designed your necklace with 1 piece of GENUINE 7X4mm faceted sapphire. 6 pieces of GENUINE 3.5X3.5mm faceted sapphire. 8 pieces of GENUINE 3X3mm faceted round diamonds. 16.8 grams of s

See Sold Price

Upcoming Sales

Sort by:

Best Match

Blue Topaz Pendant 14.25 CT DIA: .91CT 14K W/g (1 of 3)

Blue Topaz Pendant 14.25 CT DIA: .91CT 14K W/g

M.D.CHJewelry Co.

See Sold Price

Feb 24, 2024

4.17 CT Topaz & Diamond Hearts Fine Designer Set (1 of 2)

4.17 CT Topaz & Diamond Hearts Fine Designer Set

U.S. Auction Gallery

See Sold Price

Feb 26, 2024

4.08 Ct Certified Topaz, Sapphire & Diamond Ring $4,257 (1 of 2)

4.08 Ct Certified Topaz, Sapphire & Diamond Ring $4,257

U.S. Auction Gallery

See Sold Price

Feb 26, 2024

9.22 Ct Blue Topaz & Diamond 18KGP Designer Bracelet (1 of 2)

9.22 Ct Blue Topaz & Diamond 18KGP Designer Bracelet

U.S. Auction Gallery

See Sold Price

Feb 26, 2024

4.08 Ct Certified Topaz, Sapphire & Diamond Ring $4,257 (1 of 2)

4.08 Ct Certified Topaz, Sapphire & Diamond Ring $4,257

U.S. Auction Gallery

See Sold Price

Mar 05, 2024

1.92 CT Blue Topaz & Diamond 18KGP Designer Necklace (1 of 2)

1.92 CT Blue Topaz & Diamond 18KGP Designer Necklace

U.S. Auction Gallery

See Sold Price

Mar 05, 2024

4.15 Cts Certified Topaz & Diamond Gold Ring $4,325.00 (1 of 2)

4.15 Cts Certified Topaz & Diamond Gold Ring $4,325.00

U.S. Auction Gallery

See Sold Price

Mar 05, 2024

1.41 CT Certified Topaz & Diamond 14Kw Ring $4,170.00 (1 of 2)

1.41 CT Certified Topaz & Diamond 14Kw Ring $4,170.00

U.S. Auction Gallery

See Sold Price

Mar 05, 2024

1.41 CT Blue Topaz & Diamond 18KGP Designer Bracelet (1 of 2)

1.41 CT Blue Topaz & Diamond 18KGP Designer Bracelet

U.S. Auction Gallery

See Sold Price

Mar 05, 2024

1.41 CT Blue Topaz & Diamond 18KGP Designer Bracelet (1 of 3)

1.41 CT Blue Topaz & Diamond 18KGP Designer Bracelet

U.S. Auction Gallery

See Sold Price

Mar 05, 2024

5.09 CT Blue Topaz & Diamond 18KGP Designer Necklace $675 (1 of 1)

5.09 CT Blue Topaz & Diamond 18KGP Designer Necklace $675

U.S. Auction Gallery

See Sold Price

Mar 05, 2024

7.68 CT Blue Topaz & Diamond Designer Necklace $1,120 (1 of 1)

7.68 CT Blue Topaz & Diamond Designer Necklace $1,120

U.S. Auction Gallery

See Sold Price

Mar 05, 2024

5.09 CT Blue Topaz & Diamond 18KGP Designer Necklace (1 of 2)

5.09 CT Blue Topaz & Diamond 18KGP Designer Necklace

U.S. Auction Gallery

See Sold Price

Mar 05, 2024

9.22 Ct Blue Topaz & Diamond 18KGP Designer Bracelet (1 of 2)

9.22 Ct Blue Topaz & Diamond 18KGP Designer Bracelet

U.S. Auction Gallery

See Sold Price

Mar 05, 2024

Blue Topaz and Alternate Diamond 1/3 Ct.Tw. Stack Band in 10K White Gold (1 of 1)

Blue Topaz and Alternate Diamond 1/3 Ct.Tw. Stack Band in 10K White Gold

See Sold Price

Feb 23, 2024

13.65 ct Azure Dream Blue Topaz Gemstone (1 of 2)

13.65 ct Azure Dream Blue Topaz Gemstone

Weatherham Estate Treasures

See Sold Price

Mar 14, 2024

Vintage Pear Blue Topaz Diamond Cocktail Ring 14K Yellow Gold, 5.55 CTW, 6.42 Gr (1 of 12)

Vintage Pear Blue Topaz Diamond Cocktail Ring 14K Yellow Gold, 5.55 CTW, 6.42 Gr

See Sold Price

Feb 27, 2024

Oval Swiss Blue Topaz Diamond Gemstone Necklace Pendant 14K Yellow Gold, 2.90 Gr (1 of 7)

Oval Swiss Blue Topaz Diamond Gemstone Necklace Pendant 14K Yellow Gold, 2.90 Gr

See Sold Price

Feb 27, 2024

14KT White Gold 14.73 ctw Topaz and Diamond Ring (1 of 5)

14KT White Gold 14.73 ctw Topaz and Diamond Ring

Federal Assets Auctioneers

See Sold Price

Feb 26, 2024

14K GOLD 32.8 CT VIVID BLUE NATURAL TOPAZ & DIAMOND RING (1 of 6)

14K GOLD 32.8 CT VIVID BLUE NATURAL TOPAZ & DIAMOND RING

See Sold Price

Mar 03, 2024

14k White Gold 8ct Topaz 1.80ct Diamond Earrings (1 of 3)

14k White Gold 8ct Topaz 1.80ct Diamond Earrings

Prestige Auction Galleries

See Sold Price

Feb 28, 2024

14k White Gold 8ct Topaz 1.80ct Diamond Earrings (1 of 3)

14k White Gold 8ct Topaz 1.80ct Diamond Earrings

Prestige Auction Galleries

See Sold Price

Mar 02, 2024

14k White Gold 8ct Topaz 1.80ct Diamond Earrings (1 of 3)

14k White Gold 8ct Topaz 1.80ct Diamond Earrings

Prestige Auction Galleries

See Sold Price

Mar 06, 2024

TOP