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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 Trillion Setting - Ada Diamonds

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

Asscher and Trillion Setting

Emerald and Trillion Setting

Oval and Trillion Setting

Princess and Trillion Setting

Radiant and Trillion Setting

Wedding Band Sitting Flush Against Engagement Ring - Design Number: AD-472

Lab Diamonds Cushion and Trillion Diamond Engagement Ring in White Gold (Main View)

Man Made Diamonds set in White Gold Cushion and Trillion Setting (Main View)

White Gold Cushion and Trillion Setting featuring Hand Selected Diamonds (Main View)

Lab Diamonds set in White Gold Cushion and Trillion Setting (Profile View)

White Gold Cushion and Trillion Diamond Engagement Ring featuring Lab Diamonds (Profile View)

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

High Quality Lab Diamonds set in White Gold Cushion and Trillion Setting (Profile View)

Hand Selected Diamonds Cushion and Trillion Diamond Engagement Ring in White Gold (Side View)

Diamonds Cushion and Trillion Setting in White Gold (Side View)

Hand Selected Synthetic Diamonds set in Yellow Gold Cushion and Trillion Diamond Engagement Ring (Main View)

Yellow Gold Cushion and Trillion Diamond Engagement Ring featuring Lab Grown Diamonds (Main View)

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

Lab Diamonds set in Yellow Gold Cushion and Trillion Setting (Main View)

Diamonds set in Rose Gold Cushion and Trillion Setting (Main View)

Lab Diamonds set in Rose Gold Cushion and Trillion Diamond Engagement Ring (Main View)

Synthetic Diamonds set in Rose Gold Cushion and Trillion Diamond Engagement Ring (Main View)

Hand Selected Created Diamonds set in Rose Gold Cushion and Trillion Setting (Main View)

Lab Diamonds Cushion and Trillion Diamond Engagement Ring in Platinum & Yellow Gold (Main View)

Platinum & Yellow Gold Cushion and Trillion Setting featuring Lab Diamonds (Main View)

Hand Selected Diamonds set in Platinum & Yellow Gold Cushion and Trillion Setting (Profile View)

Diamonds set in Platinum & Yellow Gold Cushion and Trillion Setting (Profile View)

Platinum & Yellow Gold Cushion and Trillion Setting featuring Diamonds (Profile View)

Diamonds Cushion and Trillion Diamond Engagement Ring in Platinum & Yellow Gold (Profile View)

Diamonds set in Platinum & Rose Gold Cushion and Trillion Diamond Engagement Ring (Main View)

Lab Diamonds Cushion and Trillion Diamond Engagement Ring in Platinum & Rose Gold (Main View)

High Quality Created Diamonds Cushion and Trillion Setting in Platinum & Rose Gold (Profile View)

Platinum & Rose Gold Cushion and Trillion Setting featuring Lab Grown Diamonds (Profile View)

Platinum & Rose Gold Cushion and Trillion Diamond Engagement Ring featuring Lab Diamonds (Main View)

Lab Diamonds set in Platinum & Rose Gold Cushion and Trillion Setting (Main View)

Lab Diamonds set in Platinum & Rose Gold Cushion and Trillion Diamond Engagement Ring (Profile View)

Platinum & Rose Gold Cushion and Trillion Diamond Engagement Ring featuring High Quality Man Made Diamonds (Profile View)

Exceptional Quality 3.0 ct Diamonds set in Platinum Cushion and Trillion Diamond Engagement Ring (Main View)

Cushion and Trillion Setting featuring Hand Selected Diamonds

Diamonds set in Cushion and Trillion Diamond Engagement Ring (Profile View)

platinum 2 carat cushion cut and trillion lab diamond engagement ring ada diamonds design ad472

platinum 2 ct cushion cut and trillion three stone lab created diamond engagement ring ada diamonds design ad 472

platinum three stone 2 ct cushion cut lab diamond engagement ring with trillion side stones ada diamonds design ad472 profile view

platinum 2 carat three stone lab diamond engagement ring featuring cushion cut and trillion side stones ada diamonds design ad 472

Hand Selected 3.0 ctw Diamonds set in Platinum Cushion and Trillion Diamond Engagement Ring (Main View)

Platinum Cushion and Trillion Diamond Engagement Ring featuring 2.0 Carat Diamonds (Main View)

2.5ctw Cushion and Trillion Three Stone Engagement Ring in Platinum

2.0 ct Lab Diamonds set in Platinum Cushion and Trillion Setting (Profile View)

2.4ctw Cushion and Trillion Three Stone Engagement Ring in Platinum

Your Choice of Gold: Triangular Brilliants (Straight):3.25mm Side Stones (~0.2ctw): $2,450 USD3.5mm Side Stones (~0.3ctw): $2,550 USD4mm Side Stones (~0.4ctw): $2,650 USD4.5mm Side Stones (~0.5ctw): $2,750 USD4.75mm Side Stones (~0.6ctw): $2,900 USD Trillions (Rounded):4mm Side Stones (~0.4ctw): $2,650 USD4.5mm Side Stones (~0.5ctw): $3,150 USD5mm Side Stones (~0.8ctw): $3,450 USD5.5mm 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. Platinum and two-tone available for an additional $300 fee. Subject to availability; all side stone weights and measurements are approximate.

A dazzling basket style setting, featuring a pair of trillion (rounded edges) or triangular brilliant (straight edges) lab grown diamonds.

Cushion and Trillion Setting

Three Stone Trillion

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 Trillion Setting

The Perfect Match

Ready to Begin Your Concierge Experience?