Round Petite Four Prong Solitaire$$1,2501250
Browse examples, or shop diamonds & settings.
The High Jewelry Standard for Lab Grown Diamonds.
At Ada Diamonds, we specialize in curating the highest-quality lab diamonds set in made-to-order engagement rings. Each piece is produced start to finish under one roof in our NYC flagship.
No matter what you're shopping for, our team of experts is here to support you in bringing your vision to life.
Browse the gallery below to see 3 carat engagement rings we've created for past Ada clients.
What to Know
A 3 carat diamond makes a statement. It's one of those sizes that draws attention naturally, which is exactly why so many clients choose it.
No matter what size diamond you're considering, curation matters. You should never choose a diamond based on a grading report alone. While two diamonds may share identical 4Cs, they can look very different in person. Every diamond at Ada is hand-selected in person by our expert team. We curate only the rare few lab grown diamonds that meet our standards for cut precision, light performance, and beauty in real life.
Why Ada Diamonds
We know that a purchase this important deserves an exceptional experience. Whether you purchase online, or enjoy complimentary design support with a Diamond Concierge, each piece is made to order and crafted in house from start to finish. Our master jewelers create each setting one at a time, built specifically for its stone. Nothing is mass-produced. Every detail is considered, refined, and made to last for a lifetime.
Browse 3ct Engagement Rings
1 / 3
Shop Best Selling Styles
Shop Diamonds
Shop Diamonds
Shape
Carat
ShapeSave
2.75ct D VS1 Pear
Pear
2.75DVS1$5,225
2.75ct D VS1 Pear
$5,225
ShapePear
Carat2.75 CT
CutExcellent
ColorD
ClarityVS1
Measurements12.61 x 7.82 x 4.82
LabIGI
L/W Ratio1.61
2.79ct D VS1 Oval
Oval
2.79DVS1$5,150
2.79ct D VS1 Oval
$5,150
ShapeOval
Carat2.79 CT
CutExcellent
ColorD
ClarityVS1
Measurements11.03 x 8.15 x 5.07
LabGCAL
L/W Ratio1.35
2.79ct F VVS2 Oval
Oval
2.79FVVS2$4,950
2.79ct F VVS2 Oval
$4,950
ShapeOval
Carat2.79 CT
ColorF
ClarityVVS2
Measurements11.39 x 7.87 x 4.93
LabGIA
L/W Ratio1.45
2.80ct D VVS2 Pear
Pear
2.80DVVS2$6,025
2.80ct D VVS2 Pear
$6,025
ShapePear
Carat2.8 CT
ColorD
ClarityVVS2
Measurements12.69 x 7.85 x 4.88
LabGIA
L/W Ratio1.62
2.80ct E VVS2 Pear
Pear
2.80EVVS2$5,525
2.80ct E VVS2 Pear
$5,525
ShapePear
Carat2.8 CT
ColorE
ClarityVVS2
Measurements12.64 x 7.81 x 4.93
LabIGI
L/W Ratio1.62
2.80ct E VVS2 Ideal Round
Round
2.80EVVS2$5,250
2.80ct E VVS2 Ideal Round
$5,250
ShapeRound
Carat2.8 CT
CutIdeal
ColorE
ClarityVVS2
Measurements9.20 x 9.15 x 5.51
LabIGI
L/W Ratio1.01
2.82ct F VVS2 Ideal Round
Round
2.82FVVS2$4,875
2.82ct F VVS2 Ideal Round
$4,875
ShapeRound
Carat2.82 CT
CutIdeal
ColorF
ClarityVVS2
Measurements9.10 x 9.08 x 5.57
LabIGI
L/W Ratio1.00
2.82ct D VVS1 Cushion
Cushion
2.82DVVS1$6,475
2.82ct D VVS1 Cushion
$6,475
ShapeCushion
Carat2.82 CT
ColorD
ClarityVVS1
Measurements8.20 x 8.20 x 5.47
LabIGI
L/W Ratio1.00
3ct Lab Diamond FAQs
- How do I choose a carat weight for my engagement ring?
- What should I look for when choosing a lab diamond?
- How does Ada select lab diamonds?
- Can I design a custom ring?
- Does Ada sell loose diamonds?
Explore Our Guides
View More
Guide to Lab Diamond Shapes
Everything you need to know about lab diamond shapes, from round brilliants to Asscher cuts.
2.5 Carat Lab Diamond Engagement Rings
Everything you need to know about 2.5 carat lab grown diamond engagement rings.
Engagement Rings
4 Carat Lab Diamond Engagement Rings
Everything you need to know about 4 carat lab grown diamond engagement rings.
Engagement Rings
Explore Our Guides
View MoreReady to start your
concierge experience?
3 Carat Lab Grown Diamond Engagement Rings
Browse examples, or shop diamonds & settings.
Related Articles
The High Jewelry Standard for Lab Grown Diamonds.
At Ada Diamonds, we specialize in curating the highest-quality lab diamonds set in made-to-order engagement rings. Each piece is produced start to finish under one roof in our NYC flagship.
No matter what you're shopping for, our team of experts is here to support you in bringing your vision to life.
Browse the gallery below to see 3 carat engagement rings we've created for past Ada clients.
What to Know
A 3 carat diamond makes a statement. It's one of those sizes that draws attention naturally, which is exactly why so many clients choose it.
No matter what size diamond you're considering, curation matters. You should never choose a diamond based on a grading report alone. While two diamonds may share identical 4Cs, they can look very different in person. Every diamond at Ada is hand-selected in person by our expert team. We curate only the rare few lab grown diamonds that meet our standards for cut precision, light performance, and beauty in real life.
Why Ada Diamonds
We know that a purchase this important deserves an exceptional experience. Whether you purchase online, or enjoy complimentary design support with a Diamond Concierge, each piece is made to order and crafted in house from start to finish. Our master jewelers create each setting one at a time, built specifically for its stone. Nothing is mass-produced. Every detail is considered, refined, and made to last for a lifetime.
Browse 3ct Engagement Rings
1 / 3
Shop Best Selling Styles
Shop Diamonds
Shop Diamonds
Shape
Carat
ShapeSave
2.75ct D VS1 Pear
Pear
2.75DVS1$5,2252.75ct D VS1 Pear
$5,225
ShapePear
Carat2.75 CT
CutExcellent
ColorD
ClarityVS1
Measurements12.61 x 7.82 x 4.82
LabIGI
L/W Ratio1.61
2.79ct D VS1 Oval
Oval
2.79DVS1$5,1502.79ct D VS1 Oval
$5,150
ShapeOval
Carat2.79 CT
CutExcellent
ColorD
ClarityVS1
Measurements11.03 x 8.15 x 5.07
LabGCAL
L/W Ratio1.35
2.79ct F VVS2 Oval
Oval
2.79FVVS2$4,9502.79ct F VVS2 Oval
$4,950
ShapeOval
Carat2.79 CT
ColorF
ClarityVVS2
Measurements11.39 x 7.87 x 4.93
LabGIA
L/W Ratio1.45
2.80ct D VVS2 Pear
Pear
2.80DVVS2$6,0252.80ct D VVS2 Pear
$6,025
ShapePear
Carat2.8 CT
ColorD
ClarityVVS2
Measurements12.69 x 7.85 x 4.88
LabGIA
L/W Ratio1.62
2.80ct E VVS2 Pear
Pear
2.80EVVS2$5,5252.80ct E VVS2 Pear
$5,525
ShapePear
Carat2.8 CT
ColorE
ClarityVVS2
Measurements12.64 x 7.81 x 4.93
LabIGI
L/W Ratio1.62
2.80ct E VVS2 Ideal Round
Round
2.80EVVS2$5,2502.80ct E VVS2 Ideal Round
$5,250
ShapeRound
Carat2.8 CT
CutIdeal
ColorE
ClarityVVS2
Measurements9.20 x 9.15 x 5.51
LabIGI
L/W Ratio1.01
2.82ct F VVS2 Ideal Round
Round
2.82FVVS2$4,8752.82ct F VVS2 Ideal Round
$4,875
ShapeRound
Carat2.82 CT
CutIdeal
ColorF
ClarityVVS2
Measurements9.10 x 9.08 x 5.57
LabIGI
L/W Ratio1.00
2.82ct D VVS1 Cushion
Cushion
2.82DVVS1$6,4752.82ct D VVS1 Cushion
$6,475
ShapeCushion
Carat2.82 CT
ColorD
ClarityVVS1
Measurements8.20 x 8.20 x 5.47
LabIGI
L/W Ratio1.00
3ct Lab Diamond FAQs
- How do I choose a carat weight for my engagement ring?
- What should I look for when choosing a lab diamond?
- How does Ada select lab diamonds?
- Can I design a custom ring?
- Does Ada sell loose diamonds?
Explore Our Guides
View MoreGuide to Lab Diamond Shapes
Everything you need to know about lab diamond shapes, from round brilliants to Asscher cuts.
2.5 Carat Lab Diamond Engagement Rings
Everything you need to know about 2.5 carat lab grown diamond engagement rings.
Engagement Rings
4 Carat Lab Diamond Engagement Rings
Everything you need to know about 4 carat lab grown diamond engagement rings.
Engagement Rings