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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 Trillion Setting - Ada Diamonds

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

Asscher and Trillion Setting

Emerald and Trillion Setting

Oval and Trillion Setting

Princess and Trillion Setting

Radiant and Trillion Setting

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)

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

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

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

Hand Selected Diamonds Cushion and Trillion Diamond Engagement Ring 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)

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

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

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

Diamonds set in Rose Gold Cushion and Trillion Setting (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)

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

Hand Selected 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)

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

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

Lab Diamonds set in Platinum & Rose Gold Cushion and Trillion Setting (Main 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 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 San Francisco, New York, and Austin TX.