Victorian Pink Sapphire Diamond Platinum 18 Karat Gold Halo Antique Ring
Located in Philadelphia, PA
Centering a cushion cut sapphire weighing approximately 3.19 carats - transparent light purplish-pink Bezel set and foil-backed with a pierced halo surround of rose cut diamonds Weig...
White Diamond, Pink Sapphire, Gold, 18k Gold, Yellow Gold, Platinum
Antique Victorian 18 Karat Gold and Platinum Old Mine Cut Diamond Shield Ring
Located in Great Neck, NY
Beautiful Victorian shield ring with old mine cut diamonds.
Diamond, 18k Gold, Yellow Gold, Platinum
Victorian 1.22 Carat Diamond Platinum 14 Karat Yellow Gold Snake Engagement Ring
Located in Philadelphia, PA
Centering an old mine cut diamond weighing approximately 1.14 carats - G color with SI2 clarity. Prong set with stylized snake head prongs - platinum at tips surrounding diamonds. De...
Diamond, White Diamond, 14k Gold, Yellow Gold, Platinum
Victorian 18k yellow gold platinum wedding band
Located in Beverly Hills, CA
Dating to the early 1900s, this Victorian wedding band is crafted in 18k yellow gold with a refined platinum top, offering a subtle contrast and enduring charm. Its smooth, low-profi...
Gold, 18k Gold, Yellow Gold, Platinum
Victorian 0.60 CTW Old European Diamond Platinum 18 Karat Gold Engagement Ring
Located in Philadelphia, PA
Centering an old European cut diamond weighing approximately 0.60 carat - M color with SI1 clarity Set with platinum-topped talon prongs with pierced garland motif gallery Flanked by...
Diamond, Gold, 18k Gold, Yellow Gold, Platinum
2 Carat Old Mine Cut Diamond Platinum Pearl Ring Antique Victorian Flower Motif
Located in New York, NY
This is a stunning antique Victorian two carat Old Mine Cut Diamond ring with a central 7MM Pearl.
Diamond, Pearl, 14k Gold, Platinum
Victorian 2.66 Carat GIA No Heat Blue Sapphire Platinum Ring w Diamond Accents
Located in Addison, TX
This is an gorgeous example of a late Victorian era sapphire ring! The stunning 2.66 carat deep royal blue sapphire sits proudly in a crown of fancy prongs!
Diamond, Blue Sapphire, Platinum
3.73 Carat Blue Sapphire Diamond Victorian Gold Platinum Cocktail Ring
Located in Stamford, CT
Victorian 1900 elongated marquise shape sapphire and diamond cocktail ring, Set with one oval sapphire and European cut diamonds.
Diamond, Sapphire, 14k Gold, Platinum, Yellow Gold, Gold
Victorian Style 1.32 Carat Old European Cut Diamond Platinum Cluster Ring
Located in Beverly Hills, CA
The sparkle and coverage of this Victorian Style Diamond Platinum Cluster Ring is just mind-blowing!
Diamond, Platinum
English Victorian diamond 18k yellow gold and platinum 5 stone ring
Located in Beverly Hills, CA
This Victorian ring from the 1900’s is crafted in 18k yellow gold with a platinum top and set with five old European cut diamonds totaling approximately .50 carats.
Diamond, Gold, 18k Gold, Yellow Gold, Platinum
1.00 Carat Old European Diamond Platinum Yellow Gold Victorian Ring
Located in Stamford, CT
This handmade diamond ring has a platinum oval top that is set with 16 bright old European cut diamonds contrasted with a 14k yellow gold shank. circa 1900’s. Crafted with precision ...
Diamond, Gold, 14k Gold, Yellow Gold, Platinum
Sold|$1,750
Victorian Amethyst Diamond Gold Ring
Located in Beverly Hills, CA
Hand crafted in 18k yellow gold and platinum. Ring size 7-3/4 and can easily be resized to fit, if needed this would come complimentary with your purchase.
Amethyst, Diamond, 18k Gold, Platinum
Sold|$2,000
Sweet Victorian Diamond Flower Ring
Located in Carmel-by-the-Sea, CA
14k rose gold ring with a platinum top and a charming floral motif, decorated with diamonds. For the antique jewelry enthusiast who would like a non-traditional wedding ring or for t...
Diamond, Rose Gold, Platinum
Victorian 1.16 Carat Old European Cut Diamond Platinum-Topped 14k Rose Gold Ring
Located in Philadelphia, PA
Designed as a navette shaped form center an old European cut diamond weighing approximately 0.30 carat total, I color with VS2 clarity - with a clustered surround of additional old E...
Diamond, White Diamond, 14k Gold, Rose Gold, Platinum
French Victorian 0.65 Ruby Diamond Platinum 18 Karat Gold Fleur-De-Lis Ring
Located in Philadelphia, PA
Designed as a chevron-shaped band centering platinum-topped shoulders and fleur-de-lis motif Bead set and prong set with rose and old European cut diamonds Weighing approximately 0...
Diamond, Ruby, Gold, 18k Gold, Yellow Gold, Platinum
Victorian Crown Rose Cut Diamonds and Lab Created Ruby in 18k and Platinum Ring
Located in Fairfield, CT
Victorian Crown Rose Cut Diamonds and Lab Created Ruby in 18k and Platinum Ring This Victorian-era ring presents a stunning combination of 18 karat rose gold and platinum, a testame...
Diamond, Ruby, Gold, 18k Gold, Yellow Gold, Platinum
Sold|$4,750
Vintage Navette Diamond Platinum Ring
Located in Beverly Hills, CA
A splash of diamonds dares to catch any passerby's attention. Featuring 9 old cut near colorless diamonds weighing approximately 1.50 carats total. Crafted in platinum. Ring size 4-1...
Diamond, Platinum
Victorian 1.25 Carat Sapphire, Diamond Platinum and 14 Karat Gold Ring
Located in Philadelphia, PA
Centering a marquise cut sapphire, weighing approximately 0.90 carats, deep, royal blue, bezel set in gold With an old European cut diamond surround, approximately 0.35 carats total...
Diamond, Blue Sapphire, 14k Gold, Platinum
Late Victorian 1.46 CTW Old Mine Diamond Platinum 14 Karat Gold Engagement Ring
Located in Philadelphia, PA
Centering an old mine cut diamond weighing approximately 1.46 carats - M color with VS2 clarity Prong set in a pierced platinum fleur-de-lis motif six pronged mounting With tri-split...
Diamond, White Diamond, Gold, 18k Gold, Yellow Gold, Platinum
Victorian Old Mine Cut Diamond 3-Stone Ring Yellow Gold and Platinum
Located in Addison, TX
Here we have a genuine turn of the century 1890's Late Victorian "3 stone" diamond ring crafted in 18 karat yellow gold and platinum.
Diamond, 18k Gold, Platinum
Victorian 3.10 CTW Ruby Emerald Diamond Platinum 18 Karat Rose Gold Navette Ring
Located in Philadelphia, PA
Designed as a navette shaped form centering a pear cut ruby, old mine cut diamond, and pear cut emerald Ruby weighs approximately 0.85 carat - transparent medium purplish red in colo...
Diamond, Emerald, Ruby, Gold, 18k Gold, Rose Gold, Yellow Gold, Platinum
Victorian Platinum 18 Karat Gold Old Euro and Old Mine Cut Diamond Ruby Ring
Located in Great Neck, NY
Gorgeous antique ring with old mine and old euro cut diamonds with a ruby as the center stone. Item #R0518 Metal: Platinum & 18K Yellow Gold Weight: 4.7 Grams Total Diamond Wei...
Diamond, Sapphire, 18k Gold, Yellow Gold, Platinum
Platinum & 18K Victorian Estate Vintage Antique Ruby and Rose Cut Diamond Ring
Located in Scottsdale, AZ
For sale is a beautiful Victorian Era Platinum, 18K Yellow Gold Ruby and Rose Cut Diamond Ring!
Diamond, Ruby, 18k Gold, Platinum
Sold|$6,800
Colombian Emerald Diamond Platinum Ring
Located in Beverly Hills, CA
One lively 1.90 carat Colombian emerald is accompanied by two old European cut diamonds, approximately 0.60 carats each, G-H color and SI clarity. With scalloped sides and prongs in ...
Emerald, Platinum
2.50 Carat Oval Cut Burma Sapphire and Diamond Victorian Era Platinum Ring
Located in Miami, FL
Victorian Era Children's Cocktail Ring: Centering an approximately ~2.50 Carat Oval-Cut Burma (Myanmar) Sapphire, framed by roughly ~3.00 Carats of Old-European Cut Diamonds, and set...
Diamond, White Diamond, Sapphire, Blue Sapphire, Platinum
Victorian Fancy Yellow Diamond Platinum 18 Karat Gold Three Stone Antique Ring
Located in Philadelphia, PA
Centering three old European cut diamonds prong set in platinum east to west Weighing approximately 0.90 carat total - fancy greenish-yellow in color With VS2 to SI1 clarity - flank...
Yellow Diamond, Gold, 18k Gold, Yellow Gold, Platinum
Victorian Platinum and 18 Karat Yellow Gold 2.55 Carat Diamond Navette Ring
Located in New York, NY
This breathtaking antique diamond ring sparkles with high quality marquise and round brilliant cut diamonds, and is elegantly designed with an artful navette style. Popular during th...
Diamond, 18k Gold, Yellow Gold, Platinum
Tiffany & Co. Victorian 2.48 CTW Sapphire Diamond Platinum 18 Karat Ring GIA
By Tiffany & Co.
Located in Philadelphia, PA
Centering an oval cut sapphire weighing 1.68 carats total - transparent medium blue in color Natural Cambodian in origin with no indications of heat treatment Prong and bar set in ...
Diamond, Blue Sapphire, Gold, 18k Gold, Yellow Gold, Platinum
Victorian 0.89 Carat Ruby Diamond Platinum-Topped 18 Karat Gold Cluster Ring
Located in Philadelphia, PA
Cluster style ring centering a round cut ruby weighing approximately 0.54 carat, vividly red in color Surrounded by ten old mine cut diamonds weighing approximately 0.35 carat total...
White Diamond, Ruby, 18k Gold
Victorian Diamond Solitaire Engagement Ring, circa 1900s
Located in London, GB
A classic and timeless engagement ring, this ring features a 0.67 carat diamond. It is a F in colour and VS2 in clarity, claw set within a platinum collet.
Diamond, 18k Gold, Platinum
Sold|$2,900
Victorian Skull and Snake Motif Ring
Located in Aspen, CO
Antique ring in 18K with platinum skulls which have rose cut diamond eyes. The intertwined snakes have a ruby and diamond in the heads. Size approx. 6. It can be sized. C.1890
Diamond, Ruby, 15k Gold, Platinum
Sold|$2,381
Victorian Old Cut Diamond Clover Ring
Located in London, GB
Here we have a charming Victorian clover ring. This piece is platinum set with a trio of round faceted old cut diamonds collectively forming the clover motif.
Diamond, Gold, Yellow Gold, Platinum
Victorian Diamond Solitaire Engagement Ring, circa 1900s
Located in London, GB
This classic Victorian engagement ring features a stunning old cushion cut diamond.
Diamond, 18k Gold, Platinum
Tiffany & Co. Victorian 2.48 CTW Sapphire Diamond Platinum 18 Karat Ring GIA
By Tiffany & Co.
Located in Philadelphia, PA
Centering an oval cut sapphire weighing 1.68 carats total - transparent medium blue in color Natural Cambodian in origin with no indications of heat treatment Prong and bar set in ...
Diamond, Sapphire, Blue Sapphire, Gold, 18k Gold, Yellow Gold, Platinum
Sold|$2,279
Victorian Ruby and Diamond Clover Ring
Located in London, GB
This ring started life as a Victorian brooch but has been transformed into a wonderful ring by master jeweller Gaetano Chiavetta.
Diamond, Ruby, Gold, Yellow Gold, Platinum
Sold|$33,500
Old European 3.94ct Diamond Platinum Ring
Located in Stamford, CT
Handmade original Platinum ring circa 1900 Victorian Platinum top quality workmanship.
Diamond, Platinum
Saunders Late Victorian 0.40 CTW Diamond And Platinum-Topped 18 Karat Gold Ring
Located in Philadelphia, PA
Centering three old European cut diamonds, weighing approximately 0.30 carats total Accented by single cut diamonds (6) weighing approximately 0.10 carats total All the diamonds ap...
Diamond, 18k Gold, Platinum
Sold|$8,096
Victorian Ruby and Diamond Cluster Ring
Located in London, GB
Colour: G-H, Clarity: VS-SI Tested As: 18ct Gold & Platinum Box: The Vintage Jeweller Ring Box
Diamond, Ruby, Gold, 18k Gold, Rose Gold, Platinum
Sold|$3,742
Victorian Ruby and Diamond Floral Ring
Located in London, GB
Here we have an excellently crafted 18ct yellow gold ring from the Victorian era. This piece showcases a wonderful open floral themed frame consisting of a vast array of rose cut dia...
Diamond, Ruby, Gold, 18k Gold, Yellow Gold, Platinum
Victorian Solitaire Diamond Engagement Ring, circa 1900s
Located in London, GB
This unique and characterful engagement ring features a single diamond weighing 0.15 carat. It is an old cut diamond, which is a hand cut stone and has been estimated as G in colour ...
Diamond, 18k Gold, Platinum
Victorian 2.20ct Diamond Cluster Ring, c.1880s
Located in London, GB
This Victorian cluster ring features a striking 0.80ct old cut diamond at the centre, complemented by eight 0.15ct diamonds encircling it and two additional 0.10ct diamonds on the sh...
Diamond, 18k Gold, Platinum
Victorian Edwardian Double Heart Moonstone Sweetheart Ring
Located in North Hollywood, CA
This lovely Victorian double heart moonstone ring is set in Platinum and 18K white gold.
Diamond, Moonstone, 18k Gold, Platinum
Sold|$1,530
Victorian Ruby and Diamond Band Ring, 1891
Located in London, GB
In the middle of this band is a grain set ruby weighing 0.15 carat and adjacent either side are old cut diamonds. The diamonds each weigh 0.05 carat. The detailing is all hand engrav...
Diamond, Ruby, 18k Gold, Platinum
2.01 Carat Victorian Diamond Cluster Ring, circa 1900s
Located in London, GB
Whilst the top of the ring is all made in platinum, the Victorian era shines through in the 18 carat yellow gold gallery and band.
Diamond, 18k Gold, Platinum
Victorian Five-Stone Diamond Ring, circa 1900s
Located in London, GB
Dating to the 1900s, this Victorian ring simply shines. Gemstone: Diamond Stone Shape: Old Cut Carat Weight: 1.90 Total Colour: G-H Clarity: VS Metal: 18ct Yellow Gold, Platinum Ag...
Diamond, 18k Gold, Platinum
Victorian Five-Stone Diamond Ring, circa 1900s
Located in London, GB
Dating to the 1900s, this Victorian ring has loads of character and would be ideal as a dress ring, or engagement ring.
Diamond, 18k Gold, Platinum
Circa 1899 Antique Victorian Platinum 18 Karat Yellow Gold Wedding Band Sz 5.25
Located in Great Neck, NY
Beautiful Victorian platinum band with gorgeous engravings all the way around.
18k Gold, Platinum
Victorian Diamond and Emerald ‘Target’ Ring, circa 1890s
Located in London, GB
Handcrafted in 18 carat yellow gold and platinum during the 1890s, this wonderful example of a Victorian era target ring features an old cut diamond 'bullseye' with an approximate we...
Diamond, Emerald, 18k Gold, Platinum
Victorian emerald diamond 18k yellow gold ring
Located in Beverly Hills, CA
A refined Victorian 18k yellow gold and platinum ring centered with a 0.60 carat emerald, accented by delicate rose and single cut diamonds for antique elegance.
Diamond, Emerald, Gold, 18k Gold, Yellow Gold, Platinum
Sold|$47,764
Victorian 3.00ct Diamond Crossover Ring, c.1900s
Located in London, GB
This stunning Crossover ring features a magnificent pair of 1.50 carat old cut diamonds as its showpiece. The diamonds range from H to I in colour and match in clarity at VS1. Down e...
Diamond, 18k Gold, Platinum
Sold|$11,839
Victorian 2.40ct Five Stone Ring, c.1880s
Located in London, GB
This enchanting Victorian ring features five old cut diamonds totalling 2.40 carat.
Diamond, 18k Gold, Platinum
Victorian Diamond Solitaire Engagement Ring, circa 1900s
Located in London, GB
This hand made ring has a claw set 0.30 carat old cut diamond in the centre. It is set within a box collet made of platinum, which really highlights the colour. Estimated as an I in ...
Diamond, 18k Gold, Platinum
Sold|$9,351
2.67 ct Diamond and Platinum Dress Ring
Located in Jesmond, Newcastle Upon Tyne
A stunning, fine and impressive vintage platinum dress ring with 2.67 carat (total) antique diamonds; part of our antique and vintage jewellery collections This stunning diamond d...
Diamond, White Diamond, Platinum
Victorian Diamond and Sapphire Twist Ring, circa 1900s
Located in London, GB
Dating to the Victorian era, this beautiful ring features a 0.40 carat old cut diamond, set alongside a 0.45 carat sapphire.
Diamond, Sapphire, 18k Gold, Platinum
Sold|$3,517
Victorian Old Cut Diamond Five-Stone Ring
Located in London, GB
Here we have a splendid five-stone diamond ring taken from the later stages of the Victorian period.
Diamond, 18k Gold, Yellow Gold, Platinum
Sold|$4,817
Victorian Five-Stone Diamond Ring
Located in London, GB
Here we have a splendid five-stone diamond ring taken from the late Victorian era. This antique piece has been crafted from platinum and features five round faceted old cut diamonds ...
Diamond, Platinum
Victorian 1.15 Carat Diamond Solitaire Ring, circa 1880s
Located in London, GB
This amazing Victorian ring dates to the 1880s. A 1.15 carat old cut diamond is showcased in the centre, and is rub over set in platinum.
Diamond, 18k Gold, Platinum
The reign of Queen Victoria encapsulates a quickly evolving period of history — and jewelry styles were no exception. No single period has seen such a diverse group of jewelry attributed to it than the Victorian era. Today, there is a vast collection of authentic antique Victorian jewelry and watches on 1stDibs.
Victorian jewelry is named after Queen Victoria, whose reign lasted from 1837 to 1901, making her the second longest-ruling monarch. (She was surpassed by Queen Elizabeth II in 2015.) During this time, different styles of fashion and jewelry came and went. Thanks to our fascination with royalty and swoon-worthy melodramas like Netflix’s The Crown — which is rife with evocative fashion, jewelry and interiors — and the 2017 feature film Victoria & Abdul, we are all familiar with her story. After the death of Victoria’s father and three childless uncles, she ascended to the throne at age 18. In 1840, Queen Victoria married the love of her life, her first cousin Prince Albert of Saxe-Coburg and Gotha.
Queen Victoria loved serpentine jewels, and she had even more power to shape trends than Kate Middleton and Meghan Markle do today. The British monarch’s best-known piece in this mold is the gold coiled-snake engagement ring she received from Prince Albert — the sinuous reptile was considered a symbol of everlasting love.
The Queen's 63-year reign has been divided by historians into the Romantic period, the early happy years, circa 1837–60; the Grand period, marked by the deaths of the Queen’s mother and husband, circa 1860–80; and the late Victorian or Aesthetic period, which lasted from about 1880 until 1901 and ushered in the Belle Époque. Queen Victoria wore her heart on her sleeve, and her fashion and jewelry reflected her emotions.
Romantic period jewelry, which featured common decorative motifs and was embellished with seed pearls, coral and turquoise, was a celebration of the young monarch’s love. Everything changed with the death of Prince Albert, and the Grand period is most often associated with mourning jewelry. Jewelry was smaller, lighter and more dainty during the late Victorian period. During this era, diamonds came into fashion, and semiprecious gems such as amethysts and opals became prevalent, too. Using gemstones for their natural beauty and not their worth was something that jewelers of the era felt passionate about, and this ideology would really become relevant in Art Nouveau jewelry.
Find a collection of authentic antique Victorian jewelry — from rings, necklaces and brooches to a range of other accessories — 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.
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.