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.

High Quality 2.0 Carat Lab Diamonds set in Yellow Gold Round Cathedral Solitaire (Profile View)

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 Cathedral Solitaire

Cushion Cathedral Solitaire

Emerald Cathedral Solitaire

Oval Cathedral Solitaire

Pear Cathedral Solitaire

Princess Cathedral Solitaire

Radiant Cathedral Solitaire

Round Cathedral Pavé Setting

Lab Diamonds set in White Gold Round Cathedral Solitaire (Main View)

White Gold Round Cathedral Solitaire Diamond Engagement Ring featuring Lab Diamonds (Profile View)

Hand Selected Lab Grown Diamonds set in White Gold Round Cathedral Solitaire (Side View)

Yellow Gold Round Cathedral Solitaire featuring Lab Diamonds (Main View)

Yellow Gold Round Cathedral Solitaire featuring Lab Grown Diamonds (Main View)

Hand Selected Lab Created Diamonds set in Rose Gold Round Cathedral Solitaire Diamond Engagement Ring (Main View)

Rose Gold Round Cathedral Solitaire featuring High Quality Lab Diamonds (Main View)

Platinum & Yellow Gold Round Cathedral Solitaire Diamond Engagement Ring featuring Diamonds (Main View)

Exceptional Quality Diamonds Round Cathedral Solitaire in Platinum & Yellow Gold (Profile View)

2.0 ct Diamonds Round Cathedral Solitaire in Platinum & Yellow Gold (Main View)

Diamonds set in Platinum & Yellow Gold Round Cathedral Solitaire (Profile View)

Lab Created Diamonds set in Platinum & Rose Gold Round Cathedral Solitaire (Main View)

High Quality Lab Diamonds set in Platinum & Rose Gold Round Cathedral Solitaire Diamond Engagement Ring (Profile View)

Diamonds Round Cathedral Solitaire Diamond Engagement Ring in Platinum & Rose Gold (Main View)

Hand Selected Lab Diamonds set in Platinum & Rose Gold Round Cathedral Solitaire Diamond Engagement Ring (Profile View)

platinum 1.5 ct round lab grown diamond cathedral solitaire engagement ring platinum ada diamonds design ad 251 macro

platinum 1.5 ct round lab grown diamond cathedral solitaire engagement ring platinum ada diamonds design ad 251 profile view

Platinum Round Cathedral Solitaire featuring 2.0 ctw Diamonds (Main View)

Platinum Round Cathedral Solitaire featuring Hand Selected 2.0 Carat Lab Diamonds (Side View)

Yellow Gold Round Cathedral Solitaire featuring 2.0 ct Diamonds (Main View)

Yellow Gold Round Cathedral Solitaire featuring Exceptional Quality 2.0 ct Lab Diamonds (Side View)

Yellow Gold Round Cathedral Solitaire Diamond Engagement Ring featuring 1.25 ct Diamonds (Main View)

1.25 Carat Diamonds set in Yellow Gold Round Cathedral Solitaire (Side View)

18k Yellow Gold Round Custom Cathedral Lab Diamond Solitaire Engagement Ring Ada Diamonds Design AD-177 Macro

18k Yellow Gold 2.5ct Round Lab Diamond Cathedral Solitaire Engagement Ring Ada Diamonds Design AD-251 Profile

Platinum Round Cathedral Solitaire Diamond Engagement Ring featuring 2.0 Carat Man Made Diamonds (Main View)

Platinum Round Cathedral Solitaire Diamond Engagement Ring featuring Exceptional Quality 2.0 Carat Lab Grown Diamonds (Profile View)

Platinum Round Cathedral Solitaire featuring Exceptional Quality 2.0 ct Lab Created Diamonds (Profile View)

2.0 ctw Lab Diamonds set in Platinum Round Cathedral Solitaire Diamond Engagement Ring (Main View)

Yellow Gold Round Cathedral Solitaire featuring 1.25 ctw Man Made Diamonds (Main View)

Hand Selected 1.0 Carat Lab Created Diamonds set in White Gold Round Cathedral Solitaire (Main View)

Yellow Gold Round Cathedral Solitaire Diamond Engagement Ring featuring 1.5 Carat Diamonds (Main View)

1.75ct round lab diamond in two tone cathedral solitaire

Yellow Gold Round Cathedral Solitaire Diamond Engagement Ring featuring Hand Selected 2.0 Carat Lab Diamonds (Main View)

Platinum Round Cathedral Solitaire Diamond Engagement Ring featuring 2.0 Carat Lab Diamonds (Main View)

platinum 2.25ct round cathedral solitaire with lab diamond ada diamonds design ad251 on model

18k Yellow Gold 2ct Round Cathedral Solitaire Engagement Ring Ada Diamonds Design AD-251 on Model

Hand Selected 2.0 ctw Lab Diamonds set in 18 Karat Yellow Gold Round Cathedral Solitaire Diamond Engagement Ring (Profile View)

2.0 Carat Diamonds set in Platinum Round Cathedral Solitaire Diamond Engagement Ring (Side View)

Platinum Round Cathedral Solitaire featuring 2.0 Carat Lab Diamonds (Main View)

2ct Round Cathedral Solitaire Engagement Ring in Platinum

Platinum Round Cathedral Solitaire featuring 2.0 Carat Diamonds (Profile View)

2ct Round Cathedral Solitaire Engagement Ring in Platinum Profile View

Yellow Gold Round Cathedral Solitaire Diamond Engagement Ring featuring 1.25 ct Lab Diamonds (Main View)

1.25ct Round Cathedral Solitaire Engagement Ring in 18k Yellow Gold

Your Choice of Gold: $1,350 USD Platinum &amp; Two-Tone: $1,600 USD Pricing is for setting only - center stone priced separately. Add a hidden halo for $500 USD.

Simple and secure, this setting features petite prongs and cathedral shoulders. Customize your lab diamond solitaire engagement ring with band widths of 1.8-2.5mm. 

Round Cathedral Solitaire

Cathedral Solitaires

Custom made-to-order round solitaire 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.