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 Trapezoid 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_!

emerald-eternity-band-with-lab-grown-diamonds.jpg

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 Trapezoid Setting

Princess and Trapezoid Setting

Radiant and Trapezoid Setting

Cushion and Half Moon Setting

White Gold Cushion and Trapezoid Diamond Engagement Ring featuring Lab Diamonds (Main View)

High Quality Lab Diamonds Cushion and Trapezoid Diamond Engagement Ring in White Gold (Main View)

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

Exceptional Quality Lab Grown Diamonds set in White Gold Cushion and Trapezoid Setting (Profile View)

White Gold Cushion and Trapezoid Diamond Engagement Ring featuring Exceptional Quality Man Made Diamonds (Side View)

Lab Diamonds Cushion and Trapezoid Diamond Engagement Ring in White Gold (Side View)

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

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

Rose Gold Cushion and Trapezoid Diamond Engagement Ring featuring Diamonds (Main View)

Hand Selected Lab Diamonds Cushion and Trapezoid Diamond Engagement Ring in Rose Gold (Main View)

Rose Gold Cushion and Trapezoid Setting featuring Lab Created Diamonds (Main View)

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

Diamonds Cushion and Trapezoid Setting in Platinum & Yellow Gold (Main View)

Platinum & Yellow Gold Cushion and Trapezoid Setting featuring Exceptional Quality Lab Diamonds (Main View)

Platinum & Yellow Gold Cushion and Trapezoid Diamond Engagement Ring featuring Man Made Diamonds (Profile View)

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

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

High Quality Lab Diamonds Cushion and Trapezoid Diamond Engagement Ring in Platinum & Yellow Gold (Profile View)

Synthetic Diamonds set in Platinum & Rose Gold Cushion and Trapezoid Setting (Main View)

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

Exceptional Quality Lab Created Diamonds Cushion and Trapezoid Setting in Platinum & Rose Gold (Profile View)

Platinum & Rose Gold Cushion and Trapezoid Setting featuring High Quality Diamonds (Profile View)

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

Platinum & Rose Gold Cushion and Trapezoid Setting featuring Man Made Diamonds (Profile View)

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

Platinum Cushion and Trapezoid Setting featuring High Quality 3.0 Carat Lab Diamonds (Main View)

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3.0 Carat Lab Grown Diamonds set in White Gold Cushion and Trapezoid Setting (Main View)

White Gold Cushion and Trapezoid Setting featuring Exceptional Quality 3.0 Carat Diamonds (Main View)

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2.0 ctw Diamonds set in Platinum Cushion and Trapezoid Setting (Profile View)

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White Gold Cushion and Trapezoid Setting featuring 3.0 ctw Diamonds (Main View)

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Platinum Cushion and Trapezoid Setting featuring 3.0 ct Lab Diamonds (Main View)

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3.0 Carat Lab Diamonds set in Platinum Cushion and Trapezoid Setting (Main View)

3.5ctw Cushion and Trapezoid Engagement Ring in Platinum

Hand Selected 3.0 ct Diamonds set in Platinum Cushion and Trapezoid Diamond Engagement Ring (Profile View)

3.5ctw Cushion and Trapezoid Engagement Ring in Platinum Profile View

3.75ct Cushion Cut & Trapezoid Lab Diamond Ring in Two Tone Platinum & Yellow Gold | Ada Diamonds

Your Choice of Gold: 0.20ct Each Side Stones (~0.40ctw): $2,650 USD0.25ct Each Side Stones (~0.50ctw): $2,750 USD0.30ct Each Side Stones (~0.60ctw): $2,900 USD0.40ct Each Side Stones (~0.80ctw): $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. Platinum and two-tone available for an additional $300 fee. Subject to availability; all side stone weights and measurements are approximate.

A modern three stone engagement ring setting, featuring a pair of brilliant cut trapezoid lab grown diamond side stones in a basket or trellis style.

Cushion and Trapezoid Setting

Three Stone Basket

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.