White Default Shadow

A sample of our hand-selected, pre-vetted, in-house inventory, immediately available for sale. Want to see more options? <a href="/inquire">Inquire</a> now for a curated list.&nbsp;

Our friendly Diamond Concierge Team is available to answer any questions you may have, help you choose a spectacular lab diamond, and customize this engagement ring to your exact specifications.

ER PDP Checkout Fine Print

Complimentary engraving up to 10 characters. Longer engravings or those with special characters may be available for an extra charge upon inquiry. Please note, resizing engraved rings may require an additional fee.

Not sure what size halo is best? <a href="/inquire">Please inquire</a> and a Diamond Concierge will be happy to discuss with you.

Always custom created, never mass-produced. We proudly craft all of our engagement rings in the USA.

Visit <a href="/visit">one of our showrooms</a> or join the thousands of clients around the world who work with us <a href="/diamond-concierge-process">entirely virtually</a>.

After checkout, a Concierge will contact you via email to confirm your order. Prior to production, you will receive a rendering of your ring's exact dimensions for your approval. If you are unresponsive, your order may be canceled.Have questions? Not ready to checkout? <a href="/inquire">Inquire</a> now and a Concierge will respond within 1 business day.&nbsp;

Setting Price as Currently Configured

PDP ER - Setting Price as Currently Configured

Free US Shipping fully insured with signature required to a residence, business address, or Fedex Office. Purchases over $15,000 will ship FedEx Priority Overnight. Purchases of less than $15,000 will ship Fedex Two Day. International Shipping to 69 countries, fully insured. International shipping fees start at $75 USD.

When it comes to durability and having an engagement ring that stands the test of time, platinum is our recommended choice for a white metal.

cushion and round three stone lab diamond engagement ring

Read Our <a href="/synthetic-diamond-facts-and-misconceptions/frequently-asked-questions-about-lab-grown-diamonds">Frequently Asked Questions</a>See Our <a href="/buy-lab-diamonds">Diamond Pricing</a>

New to Lab Diamonds?

Overlay Centered

A Purchase This Important Deserves&nbsp;an <a href="/ada-vs-competition">Impeccable Buying Experience</a>

Why Choose Ada Diamonds?

Shop <a href="/wedding-bands">Wedding Bands</a> Shop <a href="/mens-wedding-bands">Men’s Bands</a>

From Will You? to _I Do_!

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Ada was founded by a husband-wife team. <a href="/about-ada-diamonds">Our Genesis</a> &amp; <a href="/ethical-supply-chains">Our Values</a>

Grown From Love

Founders of Ada Diamonds Sitting on a Beach at Sunset

Ready to Begin Your Concierge Experience?

Engagement Modal Form

Ada Diamonds specializes in large, sensational diamonds of superlative quality. Our diamonds are cut from the highest purity diamond crystals, have optimal cut and sparkle, and are always eye clean. Much like mined diamonds, lab diamonds are priced based on their quality characteristics. Use the tool below to understand our pricing:

Ada Diamonds is the Leading Luxury Purveyor of Lab Diamonds

Oval and Round Setting

Round Three Stone Setting

White Gold Cushion and Round Setting featuring Diamonds (Main View)

Hand Selected Diamonds Cushion and Round Setting in White Gold (Main View)

Diamonds Cushion and Round Diamond Engagement Ring in White Gold (Profile View)

White Gold Cushion and Round Diamond Engagement Ring featuring High Quality Man Made Diamonds (Profile View)

Lab Grown Diamonds Cushion and Round Setting in White Gold (Side View)

Lab Grown Diamonds set in White Gold Cushion and Round Setting (Side View)

Yellow Gold Cushion and Round Diamond Engagement Ring featuring Diamonds (Main View)

Exceptional Quality Lab Grown Diamonds Cushion and Round Setting in Yellow Gold (Main View)

Yellow Gold Cushion and Round Setting featuring Lab Diamonds (Main View)

Diamonds Cushion and Round Diamond Engagement Ring in Yellow Gold (Main View)

Diamonds Cushion and Round Diamond Engagement Ring in Rose Gold (Main View)

Diamonds Cushion and Round Setting in Rose Gold (Main View)

Rose Gold Cushion and Round Setting featuring Diamonds (Main View)

High Quality Lab Diamonds Cushion and Round Diamond Engagement Ring in Rose Gold (Main View)

custom three stone ring with lab grown cushion and round side stone diamonds

1.5ct lab grown cushion cut lab diamond with round side stones

Cushion and Round Diamond Engagement Ring featuring Hand Selected Lab Diamonds

yellow gold cushion and round three stone engagement ring

Platinum Cushion and Round Diamond Engagement Ring featuring 1.5 Carat Diamonds (Main View)

2.5ct cushion cut and round lab diamond three stone ring

2.5 Carat Lab Diamonds set in White Gold Cushion and Round Setting (Main View)

Hand Selected 2.75 Carat Diamonds Cushion and Round Diamond Engagement Ring in Yellow Gold (Profile View)

1.5ct lab grown cushion diamond with round side stones in 14k yellow gold ring

2.5ct cushion cut lab diamond in a three stone setting

2.75ct cushion cut with round side stones in yellow gold

Cushion and Round Diamond Engagement Ring featuring Hand Selected Diamonds

White Gold Cushion and Round Setting featuring High Quality 2.5 ct Man Made Diamonds (Side View)

Cushion and Round Diamond Engagement Ring featuring Lab Diamonds (Main View)

Cushion and Round Setting featuring High Quality Diamonds

Your Choice of Gold: 0.20ct Each Side Stones (0.4ctw): $2,650 USD0.25ct Each Side Stones (0.5ctw): $2,750 USD0.30ct Each Side Stones (0.6ctw): $2,900 USD0.40ct Each Side Stones (0.8ctw): $3,450 USD0.50ct Each Side Stones (1.0ctw): $3,750 USD Starting at price is for the setting and side stones only (center stone priced separately) and includes DEF/VS lab grown diamond side stones. Side stones at or below 0.50ct will be uncertified and hand-selected to match your center stone. Side stones above 0.50ct are available upon request and are individually certified. Platinum and two-tone available for an additional $300 fee. This style must be modified to accommodate a mixed-metal setting.

A brilliant classic, this three stone setting features a pair of round lab grown side stones. Available in trellis or basket style.

Cushion and Round Setting

Three Stone Trellis

Custom made-to-order three stone ring featuring conflict-free lab diamonds hand-selected for quality, fire, and brilliance. Available options: platinum, 14k or 18k gold: white, yellow, rose. Ada Diamonds is the leading luxury purveyor and the best place to buy a lab diamond. Virtual consultations available worldwide; private in-person appointments available in San Francisco, New York, and Austin TX.