Need Help?

A US-based lab diamond expert will respond within 1 business day.&nbsp;

May We Help You?

A Diamond Concierge is available to help you choose the best option.

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.

Thank You for Your Inquiry! 

An Ada Diamonds concierge will contact you via email shortly. You can expect a response within 1-2 business days of your submission. We look forward to working with you.In the meantime, please follow <a target="_blank" rel="noopener noreferrer" href="https://instagram.com/adadiamonds">@AdaDiamonds</a>!

Global PopUp Form

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

Return Policy

We expect you to love your Ada jewelry. Should you be unhappy for any reason, return your item within 30 days for a full refund, less any non-refundable deposits or re-stocking fees. Jewelry must be in new, unworn condition and customer is responsible for return shipping. A return shipping label will be provided for a small fee.

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

Not sure what she wants? We can help. Propose with a classic solitaire, and then design a custom ring together.

Proposal Settings

Floral Basket Solitaire Diamond Engagement Ring featuring Man Made Diamonds (Profile View)

Floral Basket Solitaire featuring Diamonds (Profile View)

See why real couples chose Ada to tell their love story

They Said Yes! 

At Ada Diamonds, we’re different,&nbsp;we’re better, we’re worth it. Book your complimentary consultation now

The Most Trusted Experts in Lab Diamonds

Diamonds set in Pear Petite Pavé Setting (Profile View)

Pear Petite Pavé Diamond Engagement Ring featuring High Quality Lab Diamonds (Profile View)

Ready to Begin Your Concierge Experience?

Engagement Modal Form

Oval and Round Setting

Round Three Stone Setting

Wedding Band Sitting Flush Against Engagement Ring - Design Number: AD-470

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)

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

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

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

Diamonds Cushion and Round Diamond Engagement Ring 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

2.0 ctw Lab Diamonds set in Platinum & Yellow Gold Cushion and Round Diamond Engagement Ring (Main View)

High Quality 2.0 ct Synthetic Diamonds set in Platinum & Yellow Gold Cushion and Round Diamond Engagement Ring (Profile View)

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

1.5 Carat Lab Created Diamonds set in Platinum Cushion and Round Diamond Engagement Ring (Main View)

Exceptional Quality 2.0 ct Diamonds Cushion and Round Diamond Engagement Ring in Platinum & Yellow Gold (Main View)

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 New York and Austin TX.

Cushion and Round Setting

The Perfect Match

Ready to Begin Your Concierge Experience?