Skip to main content

Antique Tea Glasses

to
599
2,683
1,953
2,674
1,525
1,525
758
736
601
556
405
284
236
226
178
139
135
133
131
124
95
87
79
77
60
54
51
46
46
42
41
40
18
10
7
4
3
3
3
3
2
2
2
1
60
58
50
39
35
Sort By
28-Piece Hammersley Co. Porcelain Tea Set, Blue Red Floral, Gilded, 1900
By Hammersley
Located in Worcester Park, GB
This is a beautiful 28-piece fine bone china tea set by Hammersley Co., featuring the beloved
Category

Late 19th Century Antique Tea Glasses

Materials

Porcelain

1917 Walker Hall Sterling Silver Tea Set with Cut Card Detailing
By Walker Hall
Located in London, London
This exquisite sterling silver three-piece tea set, hallmarked in Sheffield in 1917 by the
Category

1910s English Antique Tea Glasses

Materials

Sterling Silver

Exquisite Aesthetic Movement Silverplated Tea Service by Simpson, Hall Miller
By Simpson, Hall, Miller Co.
Located in Ottawa, Ontario
Exquisite Aesthetic Movement Silverplated Tea Service by Simpson, Hall & Miller Co. circa 1870-1890
Category

Late 19th Century American Aesthetic Movement Antique Tea Glasses

Materials

Silver Plate

Elaborate William IV Antique Sterling Silver Tea Set by E. Barton, 1831
By Edward Barton
Located in London, London
silver four-piece tea set is of a classic lobed or 'melon' form. The pieces have applied cast scroll feet
Category

1830s English William IV Antique Tea Glasses

Materials

Sterling Silver

Pair of Antique Chinese Porcelain Kangxi Period Amsterdam Bont Tea Bowls
Located in Amsterdam, Noord Holland
between 2 sets. Pair tea Bowl and dish. Additional information: Material: Porcelain & Pottery Region of
Category

17th Century Japanese Antique Tea Glasses

Materials

Porcelain

Old Paris Porcelain Gilt Floral Enamel Hand Painted Coffee Tea Service Set
By Old Paris
Located in Atlanta, GA
Beautiful hand-painted porcelain made in France Tea Service for 6 Tea Cups and Saucers Creamer
Category

19th Century French Victorian Antique Tea Glasses

Materials

Enamel

Japanese Porcelain Tea Cup Beaker Saucer Imari Edo Period, 18C
Located in Amsterdam, Noord Holland
Lovely set from the edo period. Additional information: Primary Material: Porcelain & Pottery Region of Origin: Japan Period: 18th century Japan Dynasty Period: Edo Period (1603–186...
Category

18th Century Japanese Edo Antique Tea Glasses

Materials

Porcelain

Japanese Porcelain Tea Cup Bowl Saucer Imari Edo Period, 18C
Located in Amsterdam, Noord Holland
Lovely set from the edo period. Additional information: Primary Material: Porcelain & Pottery Region of Origin: Japan Period: 18th century Japan Dynasty Period: Edo Period (1603–186...
Category

18th Century Japanese Edo Antique Tea Glasses

Materials

Porcelain

Incredible Teniers style sterling silver tea and coffee service hallmarked 1880
By Daniel Charles Houle
Located in London, London
Sterling Silver Tea Set, is elaborately decorated with a tavern scene in the manner of the famous Flemish
Category

1880s English Victorian Antique Tea Glasses

Materials

Sterling Silver

Christofle (Cardeilhac) - 10pc. 950 Sterling Silver Tea Set - Renaissance Model
By Christofle Cardeilhac 1
Located in Wilmington, DE
Direct from Paris, A Magnificent 10-piece Sterling Silver Tea Set by France's Premier Silversmith
Category

1910s French Renaissance Antique Tea Glasses

Materials

Sterling Silver

Antique Mermod Jaccard Co Art Nouveau Silver Plated Tea Urn Samovar
By Mermod Jaccard Co.
Located in Philadelphia, PA
Antique Mermod Jaccard & Co. Art Nouveau Silver Plated Tea Urn Samovar. Circa Early 20th Century
Category

Early 20th Century Unknown Art Nouveau Antique Tea Glasses

Materials

Silver Plate

Victorian industrial movement antique sterling silver tea set made in 1878
Located in London, London
, Antique Sterling Silver Tea Set, is elegantly plain in design, with angular silver finials to the teapot
Category

1870s English Industrial Antique Tea Glasses

Materials

Sterling Silver

Silver Tea Service by William Forbes for Ball, Tompkins Black
By William Forbes
Located in Tarzana, CA
Mid- 19th century American tea service by William Forbes for Ball, Tompkins and Black, New York
Category

19th Century American Antique Tea Glasses

Materials

Silver

Satsuma Tea Caddy and Cover Meiji Era, Late 19th Century
Located in Ottawa, Ontario
A satsuma tea caddy and cover Meiji era, late 19th century, together with, Tea caddy, The first
Category

Late 19th Century Japanese Meiji Antique Tea Glasses

Materials

Porcelain

Puiforcat (Hermes), Christofle, Faberge - 5pc. French 950 Sterling Tea Set
By Limoges, Puiforcat, Christofle Cardeilhac 1, Fabergé
Located in Wilmington, DE
Direct from Paris, a Stunning 5pc. Antique French 950 Sterling Silver Tea Set by the World's
Category

Late 19th Century French Louis XV Antique Tea Glasses

Materials

Vermeil, Sterling Silver

W W Harrison Co. An Aesthetic Movement silver-plated tea pot
By William Wheatcroft Harrison Co. 1
Located in London, GB
W W Harrison & Co (William Wheatcroft Harrison). An Aesthetic Movement silver-plated tea pot
Category

1880s English Aesthetic Movement Antique Tea Glasses

Materials

Silver Plate

19th Century French Faience 8 Piece Hand-Painted Tea Service
Located in Dallas, TX
19th century French faience 8 piece hand-painted tea service represents the remarkably unique and
Category

Late 19th Century French French Provincial Antique Tea Glasses

Materials

Faience

Antique Afternoon Tea Service, English, Silver Plated, Serving Tray, Edwardian
Located in Hele, Devon, GB
This is an antique afternoon tea service. An English, silver plated 3 piece set with serving tray
Category

Early 20th Century British Edwardian Antique Tea Glasses

Materials

Silver Plate

James Dixon Sons Sheffield Victorian Silver Plated Tilting Coffee Tea Pot
By James Dixon Sons
Located in Philadelphia, PA
James Dixon & Sons Sheffield Victorian Silver Plated Tilting Coffee Tea Pot. Item features "B from
Category

Late 19th Century Unknown Victorian Antique Tea Glasses

Materials

Silver Plate

English Measham Bargeware Blue Ribbon Teetotaler Temperance Motto Tea Kettle
By Barge Ware
Located in Philadelphia, PA
A Measham – Bargeware Tea Kettle impressed with the Blue Ribbon Temperance motto, England, circa
Category

Late 19th Century English Aesthetic Movement Antique Tea Glasses

Materials

Pottery

WMF Jugendstil Stylish Brass Three-Piece Tea Set, circa 1900
By WMF Württembergische Metallwarenfabrik
Located in Bishop s Stortford, Hertfordshire
A German Jugendstil WMF (Wurttembergische Metallwarenfabrik) mixed metal three-piece tea set
Category

Early 20th Century German Antique Tea Glasses

Materials

Brass

WD Smith Silver Co Chippendale EPNS Hepplewhite Silver Plated Tea Set - 4 pcs
Located in Philadelphia, PA
WD Smith Silver Co Chippendale EPNS Hepplewhite Silver Plated Tea Set - 4 pcs. Listing includes (1
Category

Early 1900s Victorian Antique Tea Glasses

Materials

Silver Plate

Quality antique Victorian silver mounted three piece Jasperware Wedgwood tea set
Located in Ipswich, GB
Quality antique Victorian silver mounted three piece Jasperware Wedgwood tea set having a quality
Category

Early 19th Century Antique Tea Glasses

Materials

Ceramic

Tiffany Co., France, circa 1890, French Tea and Coffee Set
By Tiffany Co.
Located in West Palm Beach, FL
Tiffany & Co., France, circa 1890, A rare French Tiffany antique sterling silver four-piece tea
Category

1890s Antique Tea Glasses

Materials

Sterling Silver

SUDLOW S - Cobalt Blue Glazed Ceramic Silver Overlay Tea Set - UK - Circa 1920
Located in Chatham, ON
SUDLOW'S - Rare antique cobalt blue glazed ceramic tea set with silver overlay - featuring
Category

Early 20th Century English Victorian Antique Tea Glasses

Materials

Silver Leaf

Antique Famille Verte Kangxi Period Tea Bowl SE Asia Chinese Porcelain
Located in Amsterdam, Noord Holland
Very rare Kangxi Famille Verte Tea Set with Ruyi decoration for the SE Asian market. Marked with a
Category

17th Century Chinese Antique Tea Glasses

Materials

Porcelain

Stoneware tea pot with spaniel lid finial by Wedgwood, c. 1829
By Wedgewood
Located in Kenilworth, IL
Slip cast stoneware tea pot in a putty colored smear glaze. The tea pot features a spaniel finial
Category

Early 19th Century British Antique Tea Glasses

Materials

Ceramic

Tiffany Co. Style Antique Victorian Silver Plate Tea and Coffee Service Set
By Tiffany Co.
Located in South Bend, IN
A gorgeous assembled antique Victorian silver plate service set, including three tea or coffee pots
Category

Early 20th Century American Victorian Antique Tea Glasses

Materials

Silver Plate

Six piece Dutch silver tea set by Van Kempen Zn, 1894
By Van Kempen
Located in Delft, NL
. The set consists of a teapot, a round sugar bowl, a milk jug, a spoon vase, a tea caddy and a glass
Category

19th Century Dutch Antique Tea Glasses

Materials

Sterling Silver

Antique Japanese Porcelain Edo Period Tea Bowl Floral Imari, 17th Century
Located in Amsterdam, Noord Holland
Porcelain decorated in underglaze cobalt blue and overglaze red. Its a mariage Edo , c. 1700 Tea
Category

17th Century Edo Antique Tea Glasses

Materials

Porcelain

Antique Chinese Porcelain Tea Set, 3 Person, Early 20th C., Hand-Painted
Located in Bastogne, BE
This charming antique porcelain tea set, crafted in China at the dawn of the 20th century. Hand
Category

1910s Chinese Chinoiserie Antique Tea Glasses

Materials

Porcelain

1910 s Carlsbad Gutherz Floral Blossom Pattern Tea or Coffee Pot
By Carlsbad
Located in Van Nuys, CA
Antique c1900s Mark & Gutherz Carlsbad Austrian Porcelain Blossom Pattern Tea/Coffee Pot
Category

1910s Austrian Antique Tea Glasses

Materials

Ceramic

George III English Sterling Silver Tea Set with Matching Tray, 18th Century
Located in North Miami, FL
This elegant George III English tea set includes a sterling silver teapot, matching hot milk pot
Category

18th Century British George III Antique Tea Glasses

Materials

Sterling Silver

English Silver Plated Bone Handle Four Piece Tea / Coffee Service / Tray
By Sheffield Silver Co.
Located in Tarry Town, NY
Handle Four-Piece Tea and Coffee Service, accompanied by a sophisticated serving tray. This exquisite set
Category

Early 20th Century English Art Deco Antique Tea Glasses

Materials

Silver Plate

Antique Reed Barton Winthrop Silver Plated Tea Set w/ Webster Wilcox Tray
Located in Philadelphia, PA
Antique Reed & Barton Winthrop Silver Plated Tea Set with Webster Wilcox Serving Tray - 6 Piece Set
Category

Early 20th Century Unknown Victorian Antique Tea Glasses

Materials

Silver Plate

Antique English Victorian Silver Plated Coffee Tea Set, 4 Pc Set
Located in Philadelphia, PA
Antique English Victorian Silver Plated Coffee Tea Set - 4 Pc Set. Item features (1) coffee pot, (1
Category

Early 1900s Victorian Antique Tea Glasses

Materials

Silver Plate

Antique Silver Plated Octagonal Tea Caddy with Lapis Lazuli Colored Detail
Located in Tilburg, NL
Antique silver plated tea caddy with Lapis Lazuli colored detail. First half of the 20th century
Category

Early 20th Century Antique Tea Glasses

Materials

Silver, Silver Plate

Antique Copper Dovetailed Goose Neck Tea Coffee Pot Kettle 12"
Located in Dayton, OH
Large 19th century dovetailed copper farmhouse kettle / coffee pot with gooseneck shaped spout, rotating bail handle and scrolled finial on the lid. Dimensions: 9.75" x 9" x 11.75" ...
Category

Late 19th Century Country Antique Tea Glasses

Materials

Copper

Antique Afternoon Tea Set, English, Bone China, Cup Saucer, Plate, Victorian
Located in Hele, Devon, GB
This is an antique two-person afternoon tea set. An English, bone China cup and saucer, sandwich
Category

Late 18th Century British Victorian Antique Tea Glasses

Materials

Porcelain

Tiffany Co. Antique Art Deco Silver Plate Coffee or Tea Service Set
By Tiffany Co.
Located in South Bend, IN
A gorgeous antique Art Deco silver soldered tea or coffee service set, including: coffee pot, tea
Category

Late 19th Century American Arts and Crafts Antique Tea Glasses

Materials

Silver Plate

Gunnar Havstad, Norwegian Art Deco Pewter Tea Set on Serving Tray, Ca. 1920s
Located in New York, NY
Norwegian Art Deco Gunnar Havstad Tea Set on Serving Tray Pewter Circa 1920s DIMENSIONS Height
Category

1920s Norwegian Art Deco Antique Tea Glasses

Materials

Pewter

Victorian Silver Plated Tea Urn with Hot Iron Holder, circa 1860
Located in London, London
Made circa 1860, this stylish, Victorian, Antique Silver Plate Tea Urn, features a pierced stand
Category

1860s English Victorian Antique Tea Glasses

Materials

Silver Plate

Sèvres Blue and Gold Porcelain Tea Set by Émile Grisard, 19th Century
By E. Grisard 1, Manufacture Nationale de Sèvres
Located in Lisbon, PT
This 19th century tea set was crafted by the prestigious Manufacture Nationale de Sèvres, one of
Category

19th Century French Rococo Revival Antique Tea Glasses

Materials

Porcelain

Antique Japanese Set of 10 Tea Coffee Cups Porcelain Eggshell
Located in Amsterdam, Noord Holland
A very nice set of 10 cups decorated. They are marked on the base. Garden scene of butterflees and birds. Additional information: Material: Porcelain & Pottery Region of Origin: Jap...
Category

19th Century Japanese Taisho Antique Tea Glasses

Materials

Porcelain

Antique Birks Regency Plate Silver Plated Tea Pot Set - 3 Pc Set
Located in Philadelphia, PA
Antique Birks Regency Plate Silver Plated Tea Pot Set - 3 Pc Set. Listing includes (1) Tea Pot
Category

Early 20th Century Unknown Regency Antique Tea Glasses

Materials

Silver Plate

Antique Webster Son Victorian Silver Plated Etched Tea Set - 3 Pc Set
Located in Philadelphia, PA
Antique Webster & Son Victorian Silver Plated Etched Tea Set - 3 Pc Set. Circa Early 20th Century
Category

Early 20th Century Unknown Victorian Antique Tea Glasses

Materials

Silver Plate

ANTIQUE INDIAN ELEPHANT COLONIAL SOLiD SILVER TEA SERVICE OOMERSI MAWJI SONS
By Oomersi Mawji Sons
Located in West Sussex, Pulborough
original circa 1870 Indian Repoussé Colonial Solid Silver tea service attributed to Oomersi Mawji & Son’s
Category

1870s Indian High Victorian Antique Tea Glasses

Materials

Silver

Very Large 10 Pc Antique Victorian Pairpoint Silverplate Quadruple Plate Tea Set
By Pairpoint Silver Company
Located in Philadelphia, PA
A fine, large 10 piece Victorian silver plated tea set. By Pairpoint. In quadruple plate
Category

Late 19th Century American Victorian Antique Tea Glasses

Materials

Silver Plate

Vintage Reed Barton Sulgrave Manor Edwardian Silver Plated Tea Set - 4 Pc Set
By Reed Barton
Located in Philadelphia, PA
Vintage Reed & Barton Sulgrave Manor Edwardian Silver Plated Tea Set - 4 Pc Set. Listing includes
Category

Early 20th Century Unknown Edwardian Antique Tea Glasses

Materials

Silver Plate

A Meissen Dot Period Porcelain Hausmaler Tea Coffee Service, 1763-74
By Meissen Porcelain
Located in Tunbridge Wells, GB
A Rare Meissen Dot Period Porcelain Hausmaler Eight Person Tea and Coffee Service 1763-74
Category

18th Century German Antique Tea Glasses

Materials

Porcelain

French 19th Century Rare Tea Set with Foliage Adorned Majolica Basket
Located in Atlanta, GA
A French tea set from the 19th century, with foliage-adorned majolica basket and handle. Created in
Category

19th Century French Antique Tea Glasses

Materials

Majolica

Magnificent Antique 8 piece Antique Silver Gilt Tea Coffee Set Paris c. 1900
By Gustave Keller Freres
Located in London, GB
A magnificent Antique French Eight Piece Silver Gilt Tea & Coffee Set of notably large size and
Category

Early 20th Century French Antique Tea Glasses

Materials

Silver

Antique Silver Tea and Coffee Set, 4-Piece Footed Service Ornate Handles lids
Located in Wembley, GB
Vintage Silver Tea and Coffee Set – 4-Piece Victorian / Edwardian Footed Service with Ornate
Category

1920s British Rococo Antique Tea Glasses

Materials

Metal, Silver, Silver Plate, Sterling Silver, Sheet Metal, Silver Leaf

Art Deco Coffee and Tea Set, Silver 835, Germany, 1900-20
Located in Belmont, MA
Coffee and tea set silver, Germany 1900-20. This pretty coffee and tea set stands out for its
Category

Early 20th Century German Art Deco Antique Tea Glasses

Materials

Silver

Vintage Tea Service H C Selb Bavaria Heinrich Porcelain, 20th Century
Located in Roma, IT
Vintage Tea Service H & C 'Selb Bavaria' Heinrich Porcelain, Germany, early 20th century. Teapot
Category

Early 20th Century German Antique Tea Glasses

Materials

Porcelain

Art Deco Tea Set by Edouard-Marcel Sandoz, Haviland, France, 1920
By Edouard-Marcel Sandoz, Haviland Co.
Located in Ciudad Autónoma Buenos Aires, C
Tea set by Edouard Marcel Sandoz (1881-1971) and manufactured by Haviland. Wapler, Jacques-Ph
Category

1920s French Art Deco Antique Tea Glasses

Materials

Ceramic

Chinese Porcelain Creamer for Tea Serving Chine de Commande, 18th Century
Located in Amsterdam, Noord Holland
. Additional information: Material: Porcelain & Pottery Type: Tea/Coffee Drinking: Bowls, Cups & Teapots Region
Category

18th Century Chinese Antique Tea Glasses

Materials

Porcelain

  • 1
  • ...
Get Updated with New Arrivals
Save "Antique Tea Glasses", and we’ll notify you when there are new listings in this category.

Antique Tea Glasses For Sale on 1stDibs

At 1stDibs, there are several options of antique tea glasses available for sale. Each of these unique antique tea glasses was constructed with extraordinary care, often using metal, silver and ceramic. There are all kinds of antique tea glasses available, from those produced as long ago as the 18th Century to those made as recently as the 20th Century. There are many kinds of antique tea glasses to choose from, but at 1stDibs, Victorian, Georgian and Regency antique tea glasses are of considerable interest. Many antique tea glasses are appealing in their simplicity, but Coalport Porcelain, Tiffany Co. and Meissen Porcelain produced popular antique tea glasses that are worth a look.

How Much are Antique Tea Glasses?

Antique tea glasses can differ in price owing to various characteristics — the average selling price at 1stDibs is $1,898, while the lowest priced sells for $23 and the highest can go for as much as $220,012.

Finding the Right Dining-entertaining for You

Your dining room table is a place where stories are shared and personalities shine — why not treat yourself and your guests to the finest antique and vintage glass, silver, ceramics and serveware for your meals?

Just like the people who sit around your table, your serveware has its own stories and will help you create new memories with your friends and loved ones. From ceramic pottery to glass vases, set your table with serving pieces that add even more personality, color and texture to your dining experience.

Invite serveware from around the world to join your table settings. For special occasions, dress up your plates with a striking Imari charger from 19th-century Japan or incorporate Richard Ginori’s Italian porcelain plates into your dining experience. Celebrate the English ritual of afternoon tea with a Japanese tea set and an antique Victorian kettle. No matter how big or small your dining area is, there is room for the stories of many cultures and varied histories, and there are plenty of ways to add pizzazz to your meals.

Add different textures and colors to your table with dinner plates and pitchers of ceramic and silver or a porcelain lidded tureen, a serving dish with side handles that is often used for soups. Although porcelain and ceramic are both made in a kiln, porcelain is made with more refined clay and is more durable than ceramic because it is denser. The latter is ideal for statement pieces — your tall mid-century modern ceramic vase is a guaranteed conversation starter. And while your earthenware or stoneware is maybe better suited to everyday lunches as opposed to the fine bone china you’ve reserved for a holiday meal, handcrafted studio pottery coffee mugs can still be a rich expression of your personal style.

“My motto is ‘Have fun with it,’” says author and celebrated hostess Stephanie Booth Shafran. “It’s yin and yang, high and low, Crate Barrel with Christofle silver. I like to mix it up — sometimes in the dining room, sometimes on the kitchen banquette, sometimes in the loggia. It transports your guests and makes them feel more comfortable and relaxed.”

Introduce elegance at supper with silver, such as a platter from celebrated Massachusetts silversmith manufacturer Reed and Barton or a regal copper-finish flatware set designed by International Silver Company, another New England company that was incorporated in Meriden, Connecticut, in 1898. By then, Meriden had already earned the nickname “Silver City” for its position as a major hub of silver manufacturing.

At the bar, try a vintage wine cooler to keep bottles cool before serving or an Art Deco decanter and whiskey set for after-dinner drinks — there are many possibilities and no wrong answers for tableware, barware and serveware. Explore an expansive collection of antique and vintage glass, ceramics, silver and serveware today on 1stDibs.

Questions About Antique Tea Glasses
  • 1stDibs ExpertApril 5, 2022
    It’s the tea glass holders — rather than the glasses — that are most interesting in Russia. They’re called podstakannik, which translates to “thing under the glass.” These holders are designed to hold any drinking glass, or stakan. If you’re looking for a Russian tea glass, you might want to research stakan and podstakannik.
  • 1stDibs ExpertNovember 5, 2024
    To identify an antique tea set, look closely to determine who the manufacturer is. Locate the hallmark on the bottom of a saucer, teapot or cup. A maker’s mark on one of these items is the best indicator of the set’s origin. If you snap a photo with your smartphone or tablet, you can conduct a reverse image search to jump-start your research. Professionals recommend consulting auction catalogs, books and trusted online resources such as museum exhibition materials. With some research, you may be able to match the marking to the manufacturer's name and, from there, identify the pattern and age. 

    In 17th-century England, Chinese tea began to arrive at ports in London. Mass production of porcelain tea sets took place in the 18th century, and during the early 1800s, tea became widely affordable, and the concept of teatime took shape all over England

    Reputable soft-paste porcelain makers include Sèvres, Capodimonte and Chelsea, while Meissen was the first European maker of hard-paste porcelain. Bone china manufactories of note include Spode, Minton and Derby, which was later called the Royal Crown Derby Porcelain Company.

    Generally, a tea set is considered vintage if it’s at least 20 years old, while antiques are at least 100 years old. Although a maker’s mark is generally a helpful indicator of a given manufacturer, forgeries have occurred over the years. Look for other signifiers of a material, time period or style if you are uncertain of your piece’s origin. For help with identification, seek out a certified appraiser or knowledgeable antique dealer.

    Find antique tea sets on 1stDibs.
  • 1stDibs ExpertOctober 19, 2021
    Mercury glass, often known as "silvered glass," is an antique decorative art glass made by glassmakers in Bohemia (now the Czech Republic), England and America from the mid-nineteenth century to the early twentieth century. These are blown glass artworks with hollow interiors, the majority of which are double-walled.
  • 1stDibs ExpertJanuary 10, 2025
    There are many famous antique glass companies. Some examples include Baccarat, Barovier, Christofle, Emile Galle, Lalique, La Rochere, Mappin Webb, Muller Frères and Moser. To be considered antique, glassware must be at least 100 years old. On 1stDibs, explore a diverse assortment of antique glass.
  • 1stDibs ExpertSeptember 28, 2021
    An antique piece of stained glass could range in price from $2,000 to $100,000 depending on the style, its condition and much more. It is used in making decorative windows and other objects through which light passes. Find a collection of vintage antique stained glass on 1stDibs.