3 Carat Antique Cushion Cut Diamond
1920s Unknown 3 Carat Antique Cushion Cut Diamond
White Diamond, Platinum
19th Century French Romantic 3 Carat Antique Cushion Cut Diamond
Diamond, 18k Gold
Mid-19th Century Unknown 3 Carat Antique Cushion Cut Diamond
Diamond, Ruby, Platinum
Late 19th Century Australian Art Nouveau 3 Carat Antique Cushion Cut Diamond
Diamond, Sapphire, Gold, Platinum
Late 19th Century 3 Carat Antique Cushion Cut Diamond
Diamond, Platinum
Early 20th Century Edwardian 3 Carat Antique Cushion Cut Diamond
Diamond, Sapphire, Gold, 18k Gold
Early 20th Century Unknown Art Deco 3 Carat Antique Cushion Cut Diamond
Diamond, Platinum
19th Century French Napoleon III 3 Carat Antique Cushion Cut Diamond
Diamond, White Diamond, Gold, 18k Gold, Yellow Gold, Silver
Early 19th Century Georgian 3 Carat Antique Cushion Cut Diamond
White Diamond, Gold, 14k Gold, White Gold, Platinum, Sterling Silver
Early 1900s Edwardian 3 Carat Antique Cushion Cut Diamond
Diamond, Platinum
1920s French 3 Carat Antique Cushion Cut Diamond
Sapphire, Diamond, 18k Gold, White Gold
Early 20th Century American Edwardian 3 Carat Antique Cushion Cut Diamond
Diamond, White Diamond, Sapphire, Platinum
1920s Art Deco 3 Carat Antique Cushion Cut Diamond
Diamond, Sapphire, Blue Sapphire, Platinum
Early 1900s Unknown 3 Carat Antique Cushion Cut Diamond
Diamond, Ruby, Yellow Gold
1920s Unknown 3 Carat Antique Cushion Cut Diamond
Diamond, Emerald, Yellow Gold
Early 1900s Unknown Edwardian 3 Carat Antique Cushion Cut Diamond
Diamond, Yellow Gold
Late 19th Century French Napoleon III 3 Carat Antique Cushion Cut Diamond
Diamond, White Diamond, Sapphire, Blue Sapphire, Gold, 18k Gold, Yellow ...
Early 20th Century 3 Carat Antique Cushion Cut Diamond
Diamond, White Diamond, Platinum
Late 19th Century French Napoleon III 3 Carat Antique Cushion Cut Diamond
Diamond, Sapphire, Blue Sapphire, Gold, 18k Gold, Rose Gold
1910s Edwardian 3 Carat Antique Cushion Cut Diamond
Diamond, Gold, Platinum
Late 19th Century Victorian 3 Carat Antique Cushion Cut Diamond
Diamond, Emerald, 18k Gold, Yellow Gold
19th Century American Victorian 3 Carat Antique Cushion Cut Diamond
Sapphire, Diamond, White Diamond, Gold, 14k Gold, Yellow Gold
Early 20th Century Victorian 3 Carat Antique Cushion Cut Diamond
Diamond, Yellow Gold, Silver, 14k Gold
Late 19th Century French Napoleon III 3 Carat Antique Cushion Cut Diamond
Diamond, White Diamond, Emerald, Gold, 18k Gold, Yellow Gold, Silver, St...
1880s Unknown 3 Carat Antique Cushion Cut Diamond
Diamond, Emerald, 18k Gold, Yellow Gold, Silver
Early 1900s Unknown 3 Carat Antique Cushion Cut Diamond
Diamond, Blue Sapphire, Sapphire, 18k Gold, Yellow Gold
1860s Unknown Victorian 3 Carat Antique Cushion Cut Diamond
Diamond, Pearl, 14k Gold, Yellow Gold
1910s 3 Carat Antique Cushion Cut Diamond
Diamond, White Diamond, Sapphire, Blue Sapphire, Platinum
1870s French Napoleon III 3 Carat Antique Cushion Cut Diamond
Diamond, White Diamond, Pearl, Natural Pearl, Ruby, Gold, 18k Gold, Yell...
1880s Victorian 3 Carat Antique Cushion Cut Diamond
Diamond, Gold, 14k Gold, Yellow Gold, Enamel
Early 20th Century French Art Deco 3 Carat Antique Cushion Cut Diamond
Diamond, Platinum
1910s Edwardian 3 Carat Antique Cushion Cut Diamond
Diamond, Sapphire, Platinum
1880s Victorian 3 Carat Antique Cushion Cut Diamond
Diamond, Ruby, Gold, 18k Gold, Yellow Gold
1910s Edwardian 3 Carat Antique Cushion Cut Diamond
Alexandrite, Diamond, Platinum
1890s British Victorian 3 Carat Antique Cushion Cut Diamond
Diamond, 18k Gold
1920s French Art Deco 3 Carat Antique Cushion Cut Diamond
Diamond, White Diamond, Gold, 18k Gold, Yellow Gold, Platinum
1860s Russian 3 Carat Antique Cushion Cut Diamond
Diamond, White Diamond, Blue Diamond, Gold, 14k Gold, Yellow Gold, Enamel
1880s Victorian 3 Carat Antique Cushion Cut Diamond
Diamond, Sapphire, Gold, 18k Gold, Yellow Gold, Sterling Silver
Early 1900s Victorian 3 Carat Antique Cushion Cut Diamond
Diamond, Ruby, Gold, 14k Gold, White Gold, Yellow Gold
Late 19th Century European Victorian 3 Carat Antique Cushion Cut Diamond
Diamond, Sapphire, 18k Gold
1910s Art Deco 3 Carat Antique Cushion Cut Diamond
Diamond, Peridot, Platinum
Early 1900s European Edwardian 3 Carat Antique Cushion Cut Diamond
Diamond, Gold, Platinum
Early 20th Century European Art Deco 3 Carat Antique Cushion Cut Diamond
Diamond, Emerald, 14k Gold, White Gold, Yellow Gold
Early 20th Century 3 Carat Antique Cushion Cut Diamond
Diamond, White Diamond, Sapphire, Blue Sapphire, Platinum
Late 19th Century 3 Carat Antique Cushion Cut Diamond
Diamond, Ruby, 14k Gold
1910s French 3 Carat Antique Cushion Cut Diamond
Diamond, Ruby, Rose Gold
1910s 3 Carat Antique Cushion Cut Diamond
Diamond, Ruby, Yellow Gold
1870s Victorian 3 Carat Antique Cushion Cut Diamond
Diamond, Ruby, Gold, 18k Gold, Yellow Gold
Early 1900s Edwardian 3 Carat Antique Cushion Cut Diamond
Diamond, White Diamond, Ruby, Gold, 18k Gold, Yellow Gold, Platinum
1860s Victorian 3 Carat Antique Cushion Cut Diamond
Diamond, Pink Sapphire, Gold, 18k Gold, Yellow Gold
1920s Unknown Art Deco 3 Carat Antique Cushion Cut Diamond
Ruby, Sapphire, Rose Gold, Silver
1880s French Victorian 3 Carat Antique Cushion Cut Diamond
Diamond, Ruby, Blue Sapphire, 18k Gold, Yellow Gold
Early 20th Century American Edwardian 3 Carat Antique Cushion Cut Diamond
Diamond, Sapphire, Platinum
Early 1900s Unknown Edwardian 3 Carat Antique Cushion Cut Diamond
Diamond, Sapphire, Gold, 18k Gold, Yellow Gold, Platinum
1810s Georgian 3 Carat Antique Cushion Cut Diamond
Diamond, Emerald, 14k Gold, Sterling Silver
19th Century Victorian 3 Carat Antique Cushion Cut Diamond
Diamond, Blue Sapphire, Gold, 18k Gold, Platinum
1910s Edwardian 3 Carat Antique Cushion Cut Diamond
Diamond, Sapphire, Blue Sapphire, Gold, 14k Gold, Yellow Gold, Platinum
- 1
3 Carat Antique Cushion Cut Diamond For Sale on 1stDibs
How Much is a 3 Carat Antique Cushion Cut Diamond?
The Legacy of Diamond in Jewelry Design
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.
Read More
This Absinthe-Hued Peridot Cocktail Ring Is Positively Intoxicating
Ancient Egyptians referred to the vibrant stone as the “gem of the sun.”
Our Guide to Engagement Ring Settings – And How to Choose One
There are many ways to showcase a diamond, from traditional prongs to a smooth, streamlined bezel. Here’s everything you need to consider.
Nothing Says Summer Heat Like This Ruby-Red Cartier Stunner
The vintage bombé ring is bursting with color and timeless style.
Zircon Rings: Our Guide to a Uniquely Colorful Natural Gemstone
Zircon is a magnificent and underrated natural gemstone that has been worn and adored for centuries.
[Survey] Two-Thirds of Jewelry Gift Recipients Don’t Want to Be Surprised
Givers of fine gems enjoy surprise more than receivers, and women more than men. Find out what else our survey of 3,000 Americans revealed.
Colorful Gemstones Are a Brilliant Choice for Engagement Rings
If diamonds don’t seem right, what about a magnificent sapphire, ruby or emerald?
Our Guide to Fancy-Colored Diamond Engagement Rings
Accounting for just 1 percent of all diamonds, these marvels of nature are exceedingly rare and gorgeously complex.
Our Guide to Victorian, Edwardian and Art Deco Engagement Rings
Learn about these antique jewelry styles, then choose a design that speaks to you.