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>!

Need Help?

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

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.

Oval and Half Moon 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

Cushion and Half Moon Setting

Princess and Half Moon Setting

Radiant and Half Moon Setting

Round and Half Moon Setting

Oval and Trapezoid Setting

Hand Selected Synthetic Diamonds set in White Gold Oval and Half Moon Diamond Engagement Ring (Main View)

Lab Grown Diamonds set in White Gold Oval and Half Moon Setting (Profile View)

White Gold Oval and Half Moon Setting featuring Diamonds (Side View)

Diamonds Oval and Half Moon Diamond Engagement Ring in Yellow Gold (Main View)

Yellow Gold Oval and Half Moon Setting featuring Diamonds (Main View)

Rose Gold Oval and Half Moon Setting featuring Synthetic Diamonds (Main View)

Rose Gold Oval and Half Moon Diamond Engagement Ring featuring Created Diamonds (Main View)

Lab Diamonds set in Platinum & Yellow Gold Oval and Half Moon Setting (Main View)

Platinum & Yellow Gold Oval and Half Moon Setting featuring High Quality Lab Created Diamonds (Profile View)

2.0 Carat Man Made Diamonds Oval and Half Moon Setting in Platinum & Yellow Gold (Main View)

High Quality Lab Diamonds set in Platinum & Yellow Gold Oval and Half Moon Diamond Engagement Ring (Profile View)

Diamonds set in Platinum & Rose Gold Oval and Half Moon Setting (Main View)

Lab Diamonds Oval and Half Moon Setting in Platinum & Rose Gold (Profile View)

Platinum & Rose Gold Oval and Half Moon Diamond Engagement Ring featuring Exceptional Quality Lab Grown Diamonds (Main View)

lab created three stone engagement ring with oval and half moons

yellow gold oval and half moon three stone engagement ring

Exceptional Quality 3.0 ctw Synthetic Diamonds set in Platinum Oval and Half Moon Diamond Engagement Ring (Main View)

lab created oval three stone engagement ring

yellow gold three stone oval and half moon lab diamond engagement ring ada diamonds design ad 277

Platinum & Yellow Gold Oval and Half Moon Setting featuring 1.75 ct Lab Grown Diamonds (Main View)

platinum three stone ring with oval and half moons

2.25 Carat Man Made Diamonds set in Platinum & Yellow Gold Oval and Half Moon Diamond Engagement Ring (Profile View)

Platinum Oval and Half Moon Setting featuring 1.5 ct Lab Created Diamonds (Main View)

18k White Gold Half Moon and Oval Lab Diamond Ring Ada Diamonds Design AD-277 Profile

2.5 ctw Lab Diamonds set in Platinum Oval and Half Moon Diamond Engagement Ring (Profile View)

Yellow Gold Oval and Half Moon Diamond Engagement Ring featuring 2.0 Carat Lab Diamonds (Profile View)

two tone 1.75 ct oval and half moon lab created diamond three stone engagement ring ada diamonds design ad 277 on model

High Quality 2.25 Carat Diamonds Oval and Half Moon Diamond Engagement Ring in Yellow Gold (Main View)

2.25ct oval with half moon side stones in lab diamond engagement ring setting

2.5ct oval lab diamond in half moon setting

3.0 Carat Lab Diamonds set in Oval and Half Moon Diamond Engagement Ring

Platinum Oval and Half Moon 3.25 ct Lab Diamond Three Stone Ring Ada Diamonds Design AD-277 on Hand

Platinum Oval and Half Moon Diamond Engagement Ring featuring 3.0 ctw Diamonds (Main View)

4ctw Oval and Half Moon Engagement Ring in Platinum

Platinum Oval and Half Moon Setting featuring High Quality 3.0 ctw Lab Diamonds (Profile View)

4ctw Oval and Half Moon Three Stone Engagement Ring in Platinum Profile View

2.25 Carat Diamonds set in Yellow Gold Oval and Half Moon Setting (Main View)

2.75ctw Oval and Half Moon Three Stone Engagement Ring in 14k Yellow Gold

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 versatile three stone engagement ring setting, featuring a pair of brilliant cut half-moon shaped lab grown diamond side stones in a classic cathedral style.

Oval and Half Moon 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 New York and Austin TX.