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3 Carat Lab-Grown Diamond Engagement Rings

Every ring here holds a 3 carat lab-grown diamond center, some just over, most graded E to G in color and VS to VVS in clarity. The shapes are oval, cushion, emerald, marquise, pear, princess, radiant and round, set as solitaires, hidden halos, pavé bands and bridal sets, in 14K or 18K gold.

Showing 26 of 26 total
14K
Lab-grown
Marquise Diamond Engagement Ring 3 CT in 14K gold
Best Seller
$2,500

14K Gold Marquise Lab-Grown Diamond Engagement Ring 3 CT 71345

14K

14K
Lab-grown
Astral Engagement Ring in 14K gold
Best Seller
$1,900

14K Gold Astral Lab-Grown Diamond Engagement Ring 71303

14K · 1.8 mm

18K
Lab-grown
oval lab grown diamond solitaire engagement ring in 18k gold – solitaire setting, elongated oval stone, top-down view
Sale
Best Seller
$3,000

18K Gold Oval Lab Grown Diamond Solitaire Engagement Ring 68285

18K

14K
Lab-grown
Marquise Cathedral Pavé Engagement Ring in 14K gold
Best Seller
from
$2,750

14K Gold Marquise Cathedral Pavé Lab-Grown Diamond Engagement Ring 69649

14K · 1.7 mm

14K
Lab-grown
Clara Emerald Engagement Ring in 14K gold
Sale
Best Seller
$2,500

14K Gold Clara Emerald Engagement Ring with Lab-Grown Diamonds 70982

14K · 1.5 mm

14K
Lab-grown
Pear cut 3 carat diamond engagement ring in a three-prong setting
from
$2,300

14K Gold 3 Ct Mirabella Pear Lab-Grown Diamond Engagement Ring 71607

14K

14K
Lab-grown
Solitaire round brilliant diamond engagement ring in polished gold setting, center stone elevated view
from
$3,750

14K Gold Solitaire Round Brilliant Lab-Grown Diamond Engagement Ring 70119

14K

14K
Lab-grown
Radiant Cut Pavé Engagement Ring in 14K gold
from
$3,250

14K Gold Radiant Cut Pavé Lab-Grown Diamond Engagement Ring 68633

14K · 2 mm

14K
Lab-grown
Marquise-cut lab-grown diamond three-stone engagement ring with trillion side stones and pavé diamond band.
from
$3,750

14K Gold Rosaline Lab-Grown Diamond Engagement Ring 71499

14K · 2 mm

14K
Lab-grown
Willow Hidden Halo Engagement Ring in 14K gold
Best Seller
from
$3,500

14K Gold Willow Hidden Halo Lab-Grown Diamond Engagement Ring 71137

14K · 2.3 mm

14K
Lab-grown
Made to order
Radiant Cut Engagement Ring with Hidden Halo in 14K gold
from
$3,000

14K Gold Radiant Cut Lab-Grown Diamond Engagement Ring with Hidden Halo 70117

14K · 1.8 mm

18K
Lab-grown
Elongated Cushion Diamond Solitaire Engagement Ring in 18K gold
Sale
$3,000

18K Gold Elongated Cushion Lab-Grown Diamond Solitaire Engagement Ring 68640

18K · 2.3 mm

18K
Lab-grown
Princess Cut Diamond Engagement Ring Set 68836 - Image 1
from
$9,600

18K Gold Princess Cut Lab-Grown Diamond Engagement Ring Set 68836

18K

18K
Lab-grown
Diamond Engagement Ring Set Lab 69143 - Image 1
$10,200

18K Gold Diamond Engagement Ring Set Lab 69143

18K

14K
Lab-grown
Oval Shape Diamond Engagement Ring (Lab) 68286 - Image 1
from
$7,950

14K Gold Oval Shape Diamond Engagement Ring (Lab) 68286

14K

18K
Lab-grown
Oval Cut Diamond Engagement Ring 69569 - Image 1
from
$12,950

18K Gold Oval Cut Lab-Grown Diamond Engagement Ring 69569

18K

14K
Lab-grown
Oval Diamond Engagement Ring 3 Ct in 14K gold
Best Seller
from
$2,300

14K Gold Oval Lab-Grown Diamond Engagement Ring 3 Ct 71793

14K

14K
Lab-grown
14k gold 3 ct lab grown oval solitaire engagement ring with hidden halo
$3,000

14K Gold 3 Ct Oval Lab-Grown Diamond Engagement Ring with Hidden Halo 70113

14K · 1.8 mm

18K
Lab-grown
Three-stone cushion cut diamond engagement ring – cushion center stone with side diamond accents, front-facing view
from
$8,000

18K Gold Trilogy Cushion Glow Lab-Grown Diamond Engagement Ring 70688

18K

14K
Lab-grown
Solitaire Emerald Diamond Engagement Ring in 14K gold
from
$6,000

14K Gold Solitaire Emerald Lab-Grown Diamond Engagement Ring 70115

14K

14K
Lab-grown
Made to order
Pear-shaped diamond engagement ring with pavé diamond band in white gold.
from
$4,500

14K Gold Crescent Pavé Lab-Grown Diamond Engagement Ring 70946

14K · 1.8 mm

14K
Lab-grown
Princess Cut Diamond Engagement Ring (Lab) 68194 - Image 1
from
$18,700

14K Gold Princess Cut Diamond Engagement Ring (Lab) 68194

14K

18K
Lab-grown
Oval Shape Diamond Engagement Ring (Lab) 68363 - Image 1
from
$10,750

18K Gold Oval Shape Diamond Engagement Ring (Lab) 68363

18K

18K
Lab-grown
White gold solitaire engagement ring with 3ct round diamond and hidden halo setting.
from
$2,250

18K Gold 3 Ct Round Lab-Grown Diamond Engagement Ring with Hidden Halo 71519

18K · 1.8 mm

14K
Lab-grown
Emerald cut diamond engagement ring on a split shank in polished 14K yellow gold
from
$2,600

14K Gold Noble Emerald Lab-Grown Diamond Engagement Ring 71621

14K

14K
Lab-grown
Made to order
Diana Old Mine Cushion Engagement Ring in 14K gold
$3,500

14K Gold Diana Old Mine Cushion Lab-Grown Diamond Engagement Ring 71670

14K · 2 mm

ABOUT THIS COLLECTION

3 Carat Engagement Rings, Each Center a Lab-Grown Diamond

How big is 3 carats? A round 3 carat diamond measures a little over 9 mm across, and ovals, pears and marquise spread longer on the finger, so they look bigger than a round of the same weight. A lab-grown diamond is a real diamond, grown rather than mined, and far less costly than a natural stone of the same size, which is what puts 3 carats within reach. The diamond size chart gives each size in millimeters.

Step down to 2 carat engagement rings, climb the pear sizes in the Mirabella collection, see oval engagement rings and the 3 carat marquise lab-grown diamond ring, or browse lab-grown diamond engagement rings and all women's engagement rings. Call or text 212-872-9692, or visit the showroom on 47th Street.