3 Carat Diamond Engagement Rings

3 carat diamond engagement rings are a limited assortment tagged at 3 ct with diamond in the title—typically CVD lab-grown. Confirm each listing or ask about custom.

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  • Featured
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  • Alphabetically, A-Z
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  • 3CT Sterling Silver Engagement Rings Oval Moissanite Wedding Promise Side Stone Rings 3CT Sterling Silver Engagement Rings Oval Moissanite Wedding Promise Side Stone Rings three

    3CT Sterling Silver Oval Cut CVD Diamond Engagement Rings

    This elegant Diamond ring is beautifully crafted in Stering Silver, offering exceptional brilliance and long-lasting shine. The sparkling diamond design showcases refined craftsmanship and a timeless silhouette, made to highlight your center stone beautifully. Ideal for weddings, engagements, anniversaries, or promise gifts, this ring...
    £921.00 GBP
    £3,337.00 GBP
    £921.00 GBP
  • 2 PC Marquise Cut CVD Diamond Vintage Platinum Bridal Wedding Engagement Ring Set for Women2 PC Marquise Cut CVD Diamond Vintage Platinum Bridal Wedding Engagement Ring Set for Women

    2 PC Marquise Cut CVD Diamond Vintage Platinum Bridal Wedding Engagement Ring Set for Women

    This elegant Diamond ring is beautifully crafted in Stering Silver, offering exceptional brilliance and long-lasting shine. The sparkling diamond design showcases refined craftsmanship and a timeless silhouette, made to highlight your center stone beautifully. Ideal for weddings, engagements, anniversaries, or promise gifts, this ring...
    £2,105.00 GBP
    £2,525.00 GBP
    £2,105.00 GBP
  • 2 PC Radiant Cut 8 Ct.tw. CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set for Women2 PC Radiant Cut 8 Ct.tw. CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set for Women

    2 PC Radiant Cut 8 Ct.tw. CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set for Women

    This elegant Diamond ring is beautifully crafted in Stering Silver, offering exceptional brilliance and long-lasting shine. The sparkling diamond design showcases refined craftsmanship and a timeless silhouette, made to highlight your center stone beautifully. Ideal for weddings, engagements, anniversaries, or promise gifts, this ring...
    £1,031.00 GBP
    £1,714.00 GBP
    £1,031.00 GBP
  • 2 PC set 3 Carat Emerald Cut CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set for Women2 PC set 3 Carat Emerald Cut CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set for Women

    2 PC set 3 Carat Emerald Cut CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set for Women

    This elegant Diamond ring is beautifully crafted in Stering Silver, offering exceptional brilliance and long-lasting shine. The sparkling diamond design showcases refined craftsmanship and a timeless silhouette, made to highlight your center stone beautifully. Ideal for weddings, engagements, anniversaries, or promise gifts, this ring...
    £1,083.00 GBP
    £1,714.00 GBP
    £1,083.00 GBP
  • 2PC Pear Cut 4 CT CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set Open Band for Women2PC Pear Cut 4 CT CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set Open Band for Women

    2PC Pear Cut 4 CT CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set Open Band for Women

    This elegant Diamond ring is beautifully crafted in Stering Silver, offering exceptional brilliance and long-lasting shine. The sparkling diamond design showcases refined craftsmanship and a timeless silhouette, made to highlight your center stone beautifully. Ideal for weddings, engagements, anniversaries, or promise gifts, this ring...
    £893.00 GBP
    £1,714.00 GBP
    £893.00 GBP
  • 2 PC Radiant Cut 5 Carat CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set for Women2 PC Radiant Cut 5 Carat CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set for Women

    2 PC Radiant Cut 5 Carat CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set for Women

    This elegant Diamond ring is beautifully crafted in Stering Silver, offering exceptional brilliance and long-lasting shine. The sparkling diamond design showcases refined craftsmanship and a timeless silhouette, made to highlight your center stone beautifully. Ideal for weddings, engagements, anniversaries, or promise gifts, this ring...
    £1,031.00 GBP
    £3,248.00 GBP
    £1,031.00 GBP
  • 2 PC Princess Cut Hidden Halo Solitaire 3 CT CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set for Women2 PC Princess Cut Hidden Halo Solitaire 3 CT CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set for Women

    2 PC Princess Cut Hidden Halo Solitaire 3 CT CVD Diamond Sterling Silver Bridal Wedding Engagement Ring Set for Women

    This elegant Diamond ring is beautifully crafted in Stering Silver, offering exceptional brilliance and long-lasting shine. The sparkling diamond design showcases refined craftsmanship and a timeless silhouette, made to highlight your center stone beautifully. Ideal for weddings, engagements, anniversaries, or promise gifts, this ring...
    £691.00 GBP
    £1,714.00 GBP
    £691.00 GBP
  • 2 PC Round Cut CVD Diamond 925 Sterling Silver Bridal Wedding Engagement Promise Ring Set for Women2 PC Round Cut CVD Diamond 925 Sterling Silver Bridal Wedding Engagement Promise Ring Set for Women

    2 PC Round Cut CVD Diamond 925 Sterling Silver Bridal Wedding Engagement Promise Ring Set for Women

    This elegant Diamond ring is beautifully crafted in Stering Silver, offering exceptional brilliance and long-lasting shine. The sparkling diamond design showcases refined craftsmanship and a timeless silhouette, made to highlight your center stone beautifully. Ideal for weddings, engagements, anniversaries, or promise gifts, this ring...
    £2,044.00 GBP
    £1,714.00 GBP
    £2,044.00 GBP
  • 2PC Oval Cut 3 CT.T.W CVD Diamond 925 Sterling Silver Bridal Engagement Wedding Ring Set for Women2PC Oval Cut 3 CT.T.W CVD Diamond 925 Sterling Silver Bridal Engagement Wedding Ring Set for Women

    2PC Oval Cut 3 CT.T.W CVD Diamond 925 Sterling Silver Bridal Engagement Wedding Ring Set for Women

    This elegant Diamond ring is beautifully crafted in Stering Silver, offering exceptional brilliance and long-lasting shine. The sparkling diamond design showcases refined craftsmanship and a timeless silhouette, made to highlight your center stone beautifully. Ideal for weddings, engagements, anniversaries, or promise gifts, this ring...
    £662.00 GBP
    £1,714.00 GBP
    £662.00 GBP
  • 2PC Princess Cut 3 CT CVD Diamond 925 Sterling Silver Bridal Engagement Wedding Ring Set for Women2PC Princess Cut 3 CT CVD Diamond 925 Sterling Silver Bridal Engagement Wedding Ring Set for Women

    2PC Princess Cut 3 CT CVD Diamond 925 Sterling Silver Bridal Engagement Wedding Ring Set for Women

    This elegant Diamond ring is beautifully crafted in Stering Silver, offering exceptional brilliance and long-lasting shine. The sparkling diamond design showcases refined craftsmanship and a timeless silhouette, made to highlight your center stone beautifully. Ideal for weddings, engagements, anniversaries, or promise gifts, this ring...
    £553.00 GBP
    £1,714.00 GBP
    £553.00 GBP
  • 2PCS Oval Cut 3 Ct. t.wCVD Diamond 925 Sterling Silver Bridal Engagement Wedding Ring Set for Women2PCS Oval Cut 3 Ct. t.wCVD Diamond 925 Sterling Silver Bridal Engagement Wedding Ring Set for Women

    2PCS Oval Cut 3 Ct. t.wCVD Diamond 925 Sterling Silver Bridal Engagement Wedding Ring Set for Women

    This elegant Diamond ring is beautifully crafted in Stering Silver, offering exceptional brilliance and long-lasting shine. The sparkling diamond design showcases refined craftsmanship and a timeless silhouette, made to highlight your center stone beautifully. Ideal for weddings, engagements, anniversaries, or promise gifts, this ring...
    £737.00 GBP
    £1,714.00 GBP
    £737.00 GBP

From Our Designer

A 3 Carat Diamond Engagement Ring is the pinnacle of fine jewelry. At 9mm, it's a piece that will be admired for generations.

Designing at this scale requires expertise. The setting must provide robust support while remaining elegant. I recommend cathedral settings with substantial prongs, or a bezel for maximum protection.

Our direct sourcing means you pay for the diamond, not the brand name. A 3 carat diamond from Custom Bridal Ring offers the same quality as luxury retailers at factory-direct prices.

Every diamond is certified, every setting is handcrafted, and every ring carries our commitment to excellence.

Designer's Spec: - Diamond: Premium quality - Face-up: ~9.0mm - Setting: Reinforced cathedral/bezel - Band: 2.5mm+ for balance - Certification: Full documentation

Expert Guides

Why Choose a 3 Carat Diamond?

A 3 carat diamond represents the pinnacle of engagement ring luxury. Approximately 9mm in diameter, it offers magnificent presence and breathtaking beauty.

Selecting Your 3 Carat Diamond

For a 3 carat diamond:- Cut: Excellent/Ideal (imperative at this size)- Color: G-H offers best value; F+ for premium whiteness- Clarity: VS2 is typically eye-clean- Carat: Verified 3.00ct minimum

Setting Requirements

A 3 carat diamond demands a robust setting. Cathedral settings with six thick prongs, or bezel settings for maximum protection, are recommended. Band width should be 2.5mm+ for proper proportion and support.

Factory-Direct Luxury

At Custom Bridal Ring, our direct-to-consumer model means you pay for the diamond and craftsmanship — not for brand marketing or retail overhead. Our expert gemologists source the finest diamonds, and our master jewelers bring your design to life.

3ct Diamond Guide: - Face-up: ~9.0-9.2mm round - Cut: Excellent essential for brilliance - Color: G-H = value | F+ = premium - Clarity: VS2 typically eye-clean - Setting: Cathedral 6-prong or bezel

FAQs

"A 3 carat diamond (approximately 9mm round) is a bold, luxurious choice. It offers undeniable presence and is perfect for those who want a standout ring. Many of our clients choose this size for its dramatic impact and timeless elegance."
"At Custom Bridal Ring, a 3 carat diamond engagement ring represents a significant investment but at factory-direct savings of 40-60% versus traditional retail. Contact us for a personalized quote based on your preferred 4Cs and setting."
"A 3 carat diamond requires robust support. Cathedral or trellis settings with six sturdy prongs are recommended. Bezel settings offer modern protection. A wider band (2.5mm+) ensures proper proportion and security."
"We offer 3 carat diamonds in all popular cuts: round brilliant, oval, cushion, radiant, emerald, princess, pear, and marquise. Each shape has unique characteristics. Our gemologists can help you select the perfect cut."
"Absolutely! Every ring at Custom Bridal Ring is fully customizable. Choose your diamond, metal (14K/18K gold, platinum), setting style, band width, and finishing details. Our collaborative design process brings your vision to life."

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More Readings

A 3 carat diamond engagement ring represents the pinnacle of luxury. Here's how to choose wisely.

Size and PresenceAt 9mm, a 3 carat diamond is undeniably impressive. It's a ring that will be noticed and admired.

Quality vs BudgetWith 3 carat diamonds, the price increases exponentially with each color and clarity grade. Smart buyers balance quality with what matters most:- Cut: Excellent (must have)- Color: G-H (excellent value)- Clarity: VS2 (eye-clean, reasonable price)

Setting RequirementsA 3 carat diamond requires robust engineering. We recommend:- Cathedral setting with reinforced prongs- 2.5mm+ band width- Bezel option for maximum protection

Factory-Direct ValueA 3 carat diamond ring at Custom Bridal Ring offers the same quality as luxury brands at factory-direct prices. You're not paying for Madison Avenue — you're paying for the diamond.

3ct Diamond Strategy: | Priority | Choice | |----------|--------| | Cut | Excellent | | Color | G-H | | Clarity | VS2 | | Setting | Cathedral/Bezel | | Band | 2.5mm+ |