1.00 Carat Round Diamond Eternity Band Engagement Ring 14K White Gold Size 7
Located in Los Angeles, CA
Round Diamond Eternity Band Engagement Ring in 14 Karat White Gold with 1.00 Carat Total Weight Natural Diamonds. This 14K white gold diamond eternity band features a continuous row ...
Diamond, White Gold
0.18ct Art Deco Diamond Star Ring 18k White Gold Size 7.25 Ornate Hand Finished
Located in McLeansville, NC
Please note the mounting of this beautiful ring is hand finished. Gemstone Information: - Natural Diamond - Carats - 0.18ctw Cut - Swiss, Single, Round Brilliant, Old European Color...
Diamond, 18k Gold, White Gold
18K 750 White Gold Natural White VVS Diamond & Ruby Ring Size 7
Located in New York, NY
18K White Gold Natural Diamond & Ruby Ring Metal Type: 18K 750 White Gold Total Item Weight: 8.3 Grams Ring Size: 7 (Resizable) 1: Natural Diamond Weight: 0.29 Ct. Diamond Clarity G...
Diamond, Ruby, 18k Gold, White Gold
$5,500
Art Deco Diamond Ring
Located in Litchfield, CT
Circa 1920s, Platinum, American. This chic Art Deco diamond ring perfectly catches the light from every angle for a delightfully glittering presence.
Diamond, Platinum
1925s Art Deco Diamonds Platinum Signet Ring
Located in Poitiers, FR
Ring in platinum. This Art Deco signet ring features a wide, tapered band, and the setting is adorned with symmetrical geometric lines and 8/8-cut diamonds.
Diamond, White Diamond, Platinum
$360Sale Price|20% Off
New 7-Stone 5.85 Carat Emerald Cut Pink Sapphire Sterling Ring Size 6.25
Located in Eagan, MN
This ring is just stunning! It is a size 6.5. It has 7 Emerald Cut Pink Sapphire stones that total 5.85 cts. The stones are 6 x 4 mm. The ring is a size 6.5. They are all set i...
Sapphire, Pink Sapphire, Silver, Sterling Silver
$9,800
Art Deco Diamond Ring
Located in Litchfield, CT
Circa 1920s, 18k. This strikingly chic Art Deco diamond ring perfectly catches the light from every angle with its delightfully glittering presence.
Diamond, 18k Gold, White Gold
0.85 Carat Natural Diamond 14K White Gold Double Halo Engagement Ring Size 7
Located in Los Angeles, CA
Round Diamond Double Halo Engagement Ring in 14 Karat White Gold with 0.85 Carat Total Weight Natural Diamonds. This 14K white gold engagement ring features a layered double halo des...
Diamond, White Gold
Art Deco 1.10 Carat Diamond Platinum Ring
Located in beverly hills, CA
Product Details: Center Stone: Round brilliant cut diamond, approximately 1.20 carats Diamond Quality: G color, VVS2 clarity Accent Stones: Round diamonds, approximately 0.35 carats...
Diamond, Platinum
14K Yellow Gold Natural Diamond 0.41 CT Eternity Band Engagement Ring Size 7
Located in Los Angeles, CA
Band width is 2.3 MM. The height on top is 2.80 MM. Ring Size: 7 Metal: 14 Karat Yellow Gold Ring Weight: 3.2 Grams of 14 Karat Yellow Gold Diamond: Approximately 0.41 Carat Total We...
Diamond, Yellow Gold
From $2,080 / item
14K White Gold Natural Diamond Halo Cluster Ring 0.68 Carat Size 7
By Spectrum Jewels
Located in Deira, Dubai
This elegant natural diamond halo ring is crafted in solid 14K white gold and features a sophisticated cluster design that combines classic brilliance with modern styling. Showcasing...
Diamond, Gold, 14k Gold, White Gold
10K Yellow Gold Ruby & Diamond Halo Ring, 0.60 Carat Ruby Center, Size 7
Located in Palm Desert, CA
This elegant ladies' ring is crafted in 10K yellow gold and features a beautiful oval genuine ruby as the centerpiece. Measuring 6 x 4 mm and weighing approximately 0.60 carats, the ...
Diamond, Ruby, Yellow Gold, 10k Gold
Art Deco 2.82ct Diamond Emerald Anniversary Ring
Located in New York, NY
The ring is size 7 1/2 but it can be resized.
Diamond, Emerald, Platinum
Platinum 18k Diamond Sapphire Art Deco Style Ring
Located in Miami, FL
Platinum & 18k Yellow Gold Detail Weight 7.1g Center Old Mine Diamond Approx. 1ct VS1-H Sapphire Approx. 0.32ct Art Deco Style Ring Size 7 Measurements 0.63in x 0.83in
Diamond, Platinum
Vintage Art Deco Style Platinum Turquoise & Diamond Ring
Located in Brighton, GB
Art Deco Style Turquoise & Diamond Ring Platinum Circa 2000s Vintage Art Deco style ring set in platinum, centred with a vivid turquoise cabochon encircled by a halo of bright...
Diamond, Turquoise, Platinum
Eternity 7 Carat Diamond Band. Brilliant Wedding Ring Platinum G/HVS2 Sized 6
Located in New York, NY
Other Details: Primary Stone: Diamonds Diamond Weight: 7 Carats Total Diamond Cut: Round Brilliant Cut Diamond Color: G/H Diamond Clarity: VS2 Stone Setting: Shared Prong-Set Jewel...
Diamond, Platinum
Modern Art Deco Sapphires Diamonds Platinum Ring
Located in Poitiers, FR
US Size : 7 ; Free resize, please contact us. Modern art deco jewel.
Diamond, White Diamond, Sapphire, Blue Sapphire, Platinum
Art Deco Diamond and Black Onyx Ring
Located in New York, NY
Art Deco Diamond and Black Onyx Ring Description: This Art Deco ring features a round brilliant diamond framed by a bold black onyx surround, creating a striking contrast that is em...
Diamond, White Diamond, Onyx, Gold, 18k Gold, White Gold
Art Deco Diamond Plaque Filigree Engagement Ring
Located in Napoli, NA
The ring is original in every part and it comes from the private collection of an Italian noble family, excellent condition 10/10 CONDITION: Pre-Owned - Excellent METAL: 18k gold GE...
Diamond, 18k Gold, White Gold
Art Deco Jade and Diamond Platinum Ring
Located in Chipping Campden, GB
The carved Jade is fifteen by ten millimetres. Ring size N or 7. Certification included
Diamond, Jade, Platinum
Art Deco Diamond Plaque Filigree Engagement Ring
Located in Napoli, NA
CONDITION: Pre-Owned - Excellent METAL: 18k gold GEM STONE: Diamond 1,0 total carats DESIGN ERA: 1930 - Art Deco RING SIZE: US 7, Resizable on request, free of charge WEIGHT: 2,5 gr...
Diamond, 18k Gold, White Gold
Art Deco Diamond and Platinum Cluster Panel Ring
Located in Chipping Campden, GB
This is an art deco panel ring. Modelled and stones set in platinum.
Diamond, Gold, Platinum
Engagement Art Deco Ring Diamond and Ruby 18k Solid Gold 0.61 art deco(#5)
Located in Brooklyn, NY
Classic Art Deco Style Ring Great for Engagement Center is with a pint of Yellow all around sides have natural white Diamonds All stones are Natural 18k White Gold approx weight 4.80...
Yellow Diamond, Ruby, Diamond, Gold, 18k Gold
White Gold Art Deco Etched Floral Wedding Band - 18k Ring SZ 7 1/2
Located in Greensboro, NC
Size: 7 1/2 Era: Art Deco Metal Content: 18k White Gold Style: Wedding Band without Stones Theme: Floral Features: Etched Detailing Spanning the Entire Perimeter Measurements Fa...
18k Gold, White Gold
David Yurman Lexington Barrel Black Onyx and Diamond 18K Yellow Gold Ring Size 7
By David Yurman
Located in Los Angeles, CA
Band width is 2.5 MM. The height on top is 5.25 MM. Width of ring on finger (Left to Right) is 24.35 MM. Length of ring on finger (Top to Bottom) is 7.40 MM. Ring Size: 7 Metal: 18 ...
Diamond, Onyx, Yellow Gold
Art Deco GIA Certified 1.12ct Diamond Engagement Ring
Located in New York, NY
The ring is size 7 but it can be resized.
Diamond, Platinum
Art Deco style Gold & Platinum Diamond Ruby Ring
Located in Miami, FL
Platinum Weight 5.6g Featuring Old Mine Cut Diamond Approx. 0.75ct White Square Cut Ruby Red Measurements 0.74in x 0.84in Ring Size 7 Sizable
Diamond, Ruby, Platinum
Art Deco Half Carat Diamond Platinum Engagement Ring
Located in South Pasadena, CA
Art Deco diamond and platinum engagement ring circa 1925
Diamond, Platinum
14K Yellow Gold 0.70 Ct Marquise Sky Blue Topaz & Diamond Cocktail Ring - Size 7
Located in Palm Desert, CA
This exquisite vintage-style cocktail ring showcases a captivating marquise-cut sky blue topaz gemstone at its center. The vibrant blue gemstone measures 6x4mm with a weight of 0.70 ...
Diamond, Topaz, Blue Topaz, Yellow Gold
Art Deco Style, White Gold, Diamond & Sapphire Ring
Located in Brisbane City, QLD
This gorgeous ring has been made in the Art Deco style and is a more affordable way to get an Art Deco look without the associated price tag.
Diamond, Sapphire, Gold, 18k Gold, White Gold
1930s Platinum Art Deco Cabochon Emerald Engagement Ring
Located in Hicksville, NY
Year: 1930s Item Details: Ring Size: 7 (Sizable) Metal Type: Platinum [Hallmarked, and Tested] Weight: 6.95 grams Diamond Details: .20ct total weight, antique cut diamonds, G Color, ...
Diamond, Emerald, Platinum
Art Deco Platinum Ring with Diamonds and Sapphires
Located in Aventura, FL
The old mine cut diamonds display the romantic charm of vintage cutting techniques, while the precision square-cut sapphires add bold geometric lines that define the sophisticated ar...
Diamond, Sapphire, Platinum
Art Deco 1.43ct Diamond and Platinum Cocktail Ring
Located in Jesmond, Newcastle Upon Tyne
This statement Art Deco diamond ring has been independently tested using state of the art technology (Niton XL2 Analyzer) and verified as platinum.
Diamond, Platinum
1.05 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Item Details: Ring Size: 7 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.6 grams Center Diamond Details: Weight: 1.05 carat Cut: Old European Brilliant Color: K Clarity: ...
Diamond, Platinum
Art Deco Tourmaline and Diamond Platinum Ring
Located in Chipping Campden, GB
This gorgeous tourmaline is a deep green colour and measures approx 50pts. This stone is surrounded by square and round cut diamonds totalling approx 80pts. Size: O or 7 1/4 Clust...
Diamond, Tourmaline, Platinum
Art Deco 1920 Engagement Platinum Ring with Diamonds
Located in Aventura, FL
Period: 1920's Style: Art Deco Metal: Platinum Natural Stone: Diamond Ring size: 7 1/2 (sizable).
Diamond, White Diamond, Platinum
Art Deco Aquamarine & Diamond Ring
Located in Litchfield, CT
Circa 1920s, 14k, Switzerland. This beautiful Art Deco ring is all about the fine 1.83 carat aquamarine.
Aquamarine, Diamond, 14k Gold, Yellow Gold
7 Carat Brilliant Cut Wedding Ring. Diamond Eternity Band Platinum GHVS2 Sized 6
Located in New York, NY
Carat Weight: 7.11 Carats Stone Cut: Round Brilliant Cut Stone: Diamond Jewelry Type: Wedding Band Color: G-H Color Clarity: VS2 Clarity Metal: Platinum Ring Size: 6. US, Width of B...
Diamond, Platinum
Art Deco GIA Certified 1.68ct Diamond Engagement Ring
Located in New York, NY
The ring is size 7 but it can be resized. Inventory #26788OBBS
Diamond, Platinum
1930s Splendid French Art Deco Diamond Platinum Ring
Located in Poitiers, FR
US Size : 4,5, Free resize, please contact us. Authentic art deco diamond ring - Work of 1930s.
Diamond, White Diamond, Platinum
Antique Art Deco Platinum Orange Blossom Band Ring
Located in Philadelphia, PA
A fine Art Deco period band ring. In platinum. With alternating engraved diamond and circle decoration around the band.
Platinum
Art Deco 2 Toned Gold and Sapphire Ring
Located in Riverdale, NY
Unusual Art Deco White and Yellow 18k Gold ring with cornflower blue sapphire. 2 tones of 18k gold are laminated to form a slightly domed hand engraved band, set with a lovely .35 po...
Blue Sapphire, Gold, 18k Gold
.40 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Item Details: Ring Size: 7 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.1 grams Center Diamond Details: Weight: .40 Carat Cut: Old European Brilliant Color: J Clarity: V...
White Diamond, Platinum
Art Deco 1925 Platinum Foliate Antique Wedding Band Ring
Located in Philadelphia, PA
Featuring a raised folate motif fully around With grooved detailing Inscribed 'S.I.M.A.T C.H. 19V5' Tested as platinum Circa: 1925; via dated inscription Ring Size: 7 and sizable Mea...
Platinum
Art Deco 0.80 Carat Diamond Sapphire Filigree Ring
Located in Napoli, NA
Beautiful Gold handmade genuine Art Deco ring. It is set in 18k white Gold featuring a large sparkling Old European cut diamond, total weight 0,80 ct.
Diamond, Sapphire, Gold, 18k Gold
Art Deco Style Platinum Sapphire and Diamond Flowerhead Target Ring
Located in Braintree, GB
Art Deco style platinum ring, the round plaque set with an oval sapphire within radiating calibre cut sapphire petals and a diamond border.
Platinum
Art Deco Style Platinum Burmese Ruby and Diamond Navette Ring
Located in Braintree, GB
Art Deco style platinum navette ring, the oval Burmese ruby centre within a scalloped diamond surround and a border of calibre cut rubies.
Platinum
Art Deco Platinum Ring with 0.30 CTW in Diamond
Located in Aventura, FL
Accented by natural rose-cut diamonds, it delivers soft antique-style sparkle that highlights the delicate openwork filigree and crisp period character—an effortlessly wearable estat...
Diamond, Pink Diamond, Platinum
Antique Platinum 1.80ct Old European Cut Diamond Ring Art Deco Size 8
Located in Carmel By The Sea, CA
This item is offered on consignment on behalf of a client; all serious and reasonable offers are presented for consideration, and I work diligently to achieve a mutually agreeable ou...
Diamond, Platinum
Vintage Platinum Art Deco .63 Carat Diamond Ring
Located in Boston, MA
Vintage platinum Art Deco diamond ring with diamond crescents accents.
Diamond, Platinum
Art Deco Style Platinum Sapphire and Diamond Wheel Target Ring
Located in Braintree, GB
Art Deco style platinum ring, the round plaque set with an oval sapphire within a wheel of triangular cut sapphires on a diamond ground.
Platinum
Art Deco Style Platinum Sapphire and Diamond Pierced Navette Ring
Located in Braintree, GB
Art Deco style platinum navette ring, the oval sapphire centre within a pierced plaque of radiating diamond set spokes.
Platinum
1920 Art Deco Platinum Foliate Antique Wedding Band Ring
Located in Philadelphia, PA
Featuring a raised folate motif fully around With grooved detailing Inscribed 'J.C. to K.G. Dec 15th 20' Stamped for platinum Circa: 1920; via dated inscription Ring Size: 7 and siza...
Platinum
1.21 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.7 grams Center Diamond Details: Weight: 1.21carat Cut: Antique Cushion Color: Light Yellow, O/P Clarity: VS2 Si...
Diamond, Platinum
1.45 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.5 grams Center Diamond Details: Weight: 1.46 carat Cut: Antique Cushion (Old Mine Brilliant) Color: I Clarity: S...
Diamond, Platinum
Art Deco Pave and Brilliant Cut Diamond Ring
Located in New York, NY
Art Deco Pave and Brilliant Cut Diamond Ring Description: This 18K white gold ring features a striking diamond centerpiece framed within an architectural panel design inspired by ge...
Diamond, White Diamond, Gold, 18k Gold, White Gold
Art Deco Diamond Platinum Wedding Engagement Ring Edwardian
Located in New York, NY
A stunning Antique Art Deco - Edwardian Diamond Ring in Platinum with a spectacular .20 Carat Old European Cut Diamond of gorgeous F-G-H color (white!)
Diamond, Platinum
Art Deco Sapphire Diamond Platinum Engagement Ring Ref: 711902
Located in Chicago, IL
Approximate total diamond weight is 0.76 ct. Ring size 7 (17 mm) resizable
Diamond, Sapphire, Platinum
$7,000Sale Price|20% Off
1920's Art Deco Diamond Ring in Platinum
Located in New Orleans, LA
This Art Deco diamond ring features a .90 carat European cut diamond having G-H color and SI1 clarity.
Diamond, Platinum
Antique Art Deco Emerald Diamond Platinum Gold Ring
Located in Chicago, IL
Circa 1920 This very well-made antique platinum and 14K gold ring features an emerald-cut Colombian emerald of excellent bluish-green color. The emerald is set in a yellow gold beze...
Diamond, Emerald, Gold, Platinum
Fascination with the Jazz Age is endless, and even today jewelry designers continue to be inspired by authentic Art Deco jewelry and watches.
The Art Deco period, encompassing the 1920s and ’30s, ushered in a very distinct look in the design of jewelry. There were many influences on the jewelry of the era that actually began to take shape prior to the 1920s. In 1909, Serge Diaghilev brought the Ballet Russes to Paris, and women went wild for the company’s exotic and vibrant costumes It’s no wonder, then, that jade, lapis lazuli, coral, turquoise and other bright gemstones became all the rage. There already existed a fascination with the East, particularly China and Japan, and motifs consisting of fans and masks started to show up in Art Deco jewelry.
However, the event that had the greatest influence on Deco was the excavation of the tomb of King Tut in 1922. When the world saw what was hidden in Tut’s burial chamber, it sent just about everyone into a frenzy. Pierre Cartier wrote in 1923 that “the discovery of the tomb will bring some sweeping changes in fashion jewelry.” And he couldn’t have been more right. “Egyptomania” left an indelible mark on all of the major jewelry houses, from Cartier to Van Cleef & Arpels, Boucheron and Georges Fouquet. (Cartier created some of the most iconic jewelry designs that defined this era.)
While a lot of Art Deco jewelry was black and white — the black coming from the use of onyx or black enamel and the white from rock crystal and diamonds — there is plenty of color in jewelry of the era. A perfect accent to diamonds in platinum settings were blue sapphires, emeralds and rubies, and these stones were also used in combination with each other.
Many designers employed coral, jade and lapis lazuli, too. In fact, some of the most important avant-garde jewelers of the period, like Jean Després and Jean Fouquet (son of Georges), would combine white gold with ebony and malachite for a jolt of color.
A lot of the jewelry produced during this time nodded to current fashion trends, and women often accessorized their accessories. The cloche hat was often accented with geometric diamond brooches or double-clip brooches. Backless evening dresses looked fabulous with sautoir necklaces, and long pearl necklaces that ended with tassels, popular during the Edwardian period, were favored by women everywhere, including Coco Chanel.
Find unique Art Deco necklaces, earrings, bracelets and other jewelry on 1stDibs.
Antique diamond rings, diamond tiaras and dazzling vintage diamond earrings are on the wish lists of every lover of fine jewelry. And diamonds and diamond jewelry are primarily associated with storybook engagements and red-carpet grand entrances — indeed, this ultra-cherished gemstone has a dramatic history on its hands.
From “A Diamond Is Forever” to “Diamonds Are a Girl’s Best Friend,” pop culture has ingrained in our minds that diamonds are the most desired, the most lasting and the most valuable gemstone. But what makes the diamond so special? Each stone — whether it’s rubies, sapphires or another stone — is unique and important in its own right. April babies might claim diamonds for themselves, but just about everyone wants this kind of sparkle in their lives!
There are several factors that set diamonds apart from other stones, and these points are important to our gem education.
Diamonds are minerals. They are made up of almost entirely of carbon (carbon comprises 99.95 percent; the remainder consists of various trace elements). Diamonds are the hardest gemstones, ranking number 10 on the Mohs Hardness Scale. Even its name, diamond, is rooted in the Greek adamas, or unconquerable. The only object that can scratch a diamond is another diamond. Diamonds are formed deep within the earth at very high temperatures (1,652–2,372 degrees Fahrenheit at depths between 90 and 120 miles beneath the earth’s surface) and are carried up by volcanic activity. Diamonds are quite rare, according to the Gemological Institute of America, and only 30 percent of all the diamonds mined in the world are gem quality.
In the 1950s, the Gemological Institute of America developed the 4Cs grading system to classify diamonds: clarity, color, cut and carat weight. Not all diamonds are created equal (there are diamonds, and then there are diamonds). The value of the diamond depends on the clarity (flawless diamonds are very rare but a diamond's value decreases if there are many blemishes or inclusions), color (the less color the higher the grade), cut (how the diamond’s facets catch the light, certain cuts of diamonds show off the stone better than others) and carat weight (the bigger, the better).
When you start shopping for a diamond engagement ring, always prioritize the cut, which plays the largest role in the diamond's beauty (taking the time to clean your diamond ring at least every six months or so plays a role in maintaining said beauty). And on 1stDibs, a range of buying guides can be found for those in the market for antique engagement rings, vintage engagement rings or Art Deco engagement rings.
Shop antique and vintage diamond rings, diamond necklaces and other extraordinary diamond jewelry on 1stDibs.
Antique and vintage rings have long held a special place in the hearts of fine jewelry lovers all over the world.
No matter their origin or specific characteristics, rings are timeless, versatile accessories. They’ve carried deep meaning since at least the Middle Ages, when diamond rings symbolized strength and other kinds of rings were worn to signify romantic feelings or to denote an affiliation with a religious order. Rings have also forever been emblematic of eternity.
Over time, rings have frequently taken the form of serpents, which have long been associated with eternal life, health and renewal. Italian luxury jewelry house Bulgari has become famous for its widely loved Serpenti motif, for example, and its Serpenti ring, like the other accessories in the collection, began as an homage to jewelry of the Roman and Hellenistic eras. The serpent is now a popular motif in fine jewelry. Jewelry devotees have long pined for rings adorned with reptiles, thanks to antique Victorian rings — well, specifically, Queen Victoria’s illustrious engagement ring, which took the form of a gold snake set with rubies, diamonds and an emerald (her birthstone). Designs for Victorian-era engagement rings often featured repoussé work and chasing, in which patterns are hammered into the metal.
Engagement rings, which are reliably intimidating to shop for, are still widely recognized as symbols of love and commitment. On 1stDibs, a range of buying guides can be found for those in the market for antique engagement rings, vintage engagement rings or Art Deco engagement rings.
The most collectible antique engagement rings and vintage engagement rings are those from the Victorian, Edwardian and Art Deco eras. Named for the monarchies of the four King Georges, who in succession ruled England starting in 1714 (plus King William’s reign), antique Georgian rings, be they engagement rings or otherwise, are also coveted by collectors. Pearls, along with colored gemstones like garnets, rubies and sapphires, were widely used in Georgian jewelry. The late-1700s paste jewelry was a predecessor to what we now call fashion or costume jewelry.
The Art Nouveau movement (1880–1910) brought with it rings inspired by the natural world. Antique Art Nouveau rings might feature depictions of winged insects and fauna as well as women, who were simultaneously eroticized and romanticized, frequently with long flowing hair. Art Deco jewelry, on the other hand, which originated during the 1920s and ’30s, is by and large “white jewelry.” White metals, primarily platinum, were favored over yellow gold in the design of antique Art Deco rings and other accessories as well as geometric motifs, with women drawn to the era’s dazzling cocktail rings in particular.
Whether you’re hunting down a chunky classic for a Prohibition-themed cocktail party or seeking a clean contemporary design to complement your casual ensemble, find an exquisite collection of antique, new and vintage rings on 1stDibs.
Learn about these antique jewelry styles, then choose a design that speaks to you.
Ready to rock? Some of our favorite jewelry designers and dealers share indispensable advice for choosing that most important ring.
Will your beloved be enchanted by an Edwardian ring or a trendy Art Deco piece? We clue you into period styles and tips for finding the perfect ring.