0.50 to 1.00 Carat Engagement Rings | A. Brandt + Son

From half a carat to a full carat is the most popular range for antique engagement rings, balancing presence, wearability, and price. Expect old European and old mine cut diamonds in Edwardian platinum, Art Deco geometry, and estate settings, each hand-selected by Annette and Elan Brandt, dated to its era, and authenticity guaranteed.

Why Buyers Trust A. Brandt + Son

For nearly four decades, buyers across the country have trusted A. Brandt + Son for authentic antique and estate jewelry. Many travel to our Narberth showroom to see a piece in person, and every order, near or far, carries the same guarantees.

Authenticity Guarantee

Every piece is hand-selected, dated to its era, condition-graded, and backed by our guarantee.

Complimentary 2-Day Shipping

All domestic orders ship complimentary UPS 2nd Day Air, signature required and fully insured.

Complimentary Sizing

Most antique rings include complimentary sizing, and we say upfront when a setting cannot be sized.

Hassle-Free Returns

If a piece is not right, return it within our window in its original condition, no hassle.

How big does a 1 carat antique diamond look?

A one carat old cut diamond typically measures around 6 to 6.5 millimeters across, though old cuts vary. Their taller crowns can make them look a touch smaller across the top but give bold, chunky sparkle. We list measurements for each stone.

Is a 1 carat antique ring good for daily wear?

Many are, particularly sturdy platinum and gold settings. Delicate filigree needs a gentler routine. We grade the condition of every ring and tell you honestly how it will hold up so you can match the ring to your lifestyle.

Do carat weights on antique rings match modern standards?

Antique stones were often cut before the modern carat was standardized, so weights can be estimated from measurements when a stone is set. We give the best available weight for each ring and note whether it is exact or estimated.

Shop Our Timeless Collections of Antique and Vintage Jewelry

From Georgian rarities to Art Deco engagement rings, A. Brandt + Son brings together antique and estate jewelry you will not find anywhere else. Every collection is hand-selected by Annette and Elan Brandt, dated to its era, and offered with the guarantees that have defined the shop since 1988.

Shop online or visit our Narberth salon, and buy with the confidence of working directly with the family.

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Collection: Engagement Rings 0.50ct - 1.00ct

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Late Art Deco 18kt Diamond Engagement Ring 0.62ct

Art Deco 14kt Diamond Engagement Ring 0.73ct

Edwardian Mixed Metals Diamond Engage Ring 0.50ctw

Retro Platinum Marquise Diamond Ring 0.84ct

Art Deco Platinum & Diamond Engagement Ring .88ct

Art Deco 18kt Diamond Engagement Ring 0.80ct

Art Deco 18kt Gold Diamond Engagement Ring .67ct