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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 Classic Four Prong Solitaire - 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 Classic Four Prong Solitaire

Round Classic Four Prong Solitaire

Emerald Classic Four Prong Solitaire

Oval Classic Four Prong Solitaire

Princess Classic Four Prong Solitaire

Radiant Classic Four Prong Solitaire

18k White Gold Cushion Classic Four Prong Solitaire Diamond Engagement Ring featuring 2.0 Carat Lab Diamonds (Main View)

Lab Diamonds set in White Gold Cushion Classic Four Prong Solitaire (Main View)

Diamonds Cushion Classic Four Prong Solitaire in White Gold (Profile View)

Created Diamonds Cushion Classic Four Prong Solitaire Diamond Engagement Ring in White Gold (Profile View)

White Gold Cushion Classic Four Prong Solitaire Diamond Engagement Ring featuring Lab Diamonds (Side View)

Diamonds Cushion Classic Four Prong Solitaire in White Gold (Side View)

Yellow Gold Cushion Classic Four Prong Solitaire Diamond Engagement Ring featuring Diamonds (Main View)

Diamonds Cushion Classic Four Prong Solitaire in Yellow Gold (Main View)

Yellow Gold Cushion Classic Four Prong Solitaire Diamond Engagement Ring featuring Man Made Diamonds (Main View)

Yellow Gold Cushion Classic Four Prong Solitaire featuring High Quality Lab Diamonds (Main View)

Lab Diamonds set in Rose Gold Cushion Classic Four Prong Solitaire Diamond Engagement Ring (Main View)

Hand Selected Diamonds Cushion Classic Four Prong Solitaire in Rose Gold (Main View)

Rose Gold Cushion Classic Four Prong Solitaire Diamond Engagement Ring featuring Lab Diamonds (Main View)

Lab Diamonds Cushion Classic Four Prong Solitaire in Rose Gold (Main View)

Hand Selected Lab Diamonds set in Platinum & Yellow Gold Cushion Classic Four Prong Solitaire (Main View)

Platinum & Yellow Gold Cushion Classic Four Prong Solitaire featuring Created Diamonds (Main View)

Platinum & Yellow Gold Cushion Classic Four Prong Solitaire featuring High Quality Lab Grown Diamonds (Profile View)

Diamonds Cushion Classic Four Prong Solitaire in Platinum & Yellow Gold (Profile View)

Diamonds set in Platinum & Yellow Gold Cushion Classic Four Prong Solitaire (Profile View)

Exceptional Quality Diamonds Cushion Classic Four Prong Solitaire in Platinum & Rose Gold (Main View)

Diamonds Cushion Classic Four Prong Solitaire in Platinum & Rose Gold (Main View)

Lab Diamonds Cushion Classic Four Prong Solitaire Diamond Engagement Ring in Platinum & Rose Gold (Profile View)

Created Diamonds Cushion Classic Four Prong Solitaire in Platinum & Rose Gold (Profile View)

Exceptional Quality Lab Diamonds set in Platinum & Rose Gold Cushion Classic Four Prong Solitaire Diamond Engagement Ring (Main View)

Platinum & Rose Gold Cushion Classic Four Prong Solitaire featuring Lab Grown Diamonds (Main View)

Diamonds Cushion Classic Four Prong Solitaire in Platinum & Rose Gold (Profile View)

Platinum & Rose Gold Cushion Classic Four Prong Solitaire featuring Diamonds (Profile View)

Yellow Gold Cushion Classic Four Prong Solitaire featuring 1.75 Carat Man Made Diamonds (Main View)

Yellow Gold Cushion Classic Four Prong Solitaire Diamond Engagement Ring featuring 1.75 ct Diamonds (Side View)

Yellow Gold Cushion Classic Four Prong Solitaire Diamond Engagement Ring featuring 1.75 ct Lab Diamonds (Main View)

Platinum 3.5ct Cushion Cut Lab Grown Diamond Solitaire Engagement Ring Ada Diamonds Design AD-335 Macro

3.5ct Platinum Cushion Solitaire with Lab Diamond Ada Diamonds Design AD-335 Profile

Two Tone White and Rose Gold 2ct Cushion Lab Diamond Classic Solitaire Ada Diamonds Design AD-335 Artistic

14k Yellow Gold 1.25 Carat Cushion Cut Lab Created Diamond Solitaire Ada Diamonds Design AD-335 Macro

14k Yellow Gold 1.25 Carat Cushion Cut Lab Grown Diamond Solitaire Ada Diamonds Design AD-335 Profile

18k Yellow Gold 3.5ct Cushion Lab Created Diamond Solitaire Engagement Ring Ada Diamonds Design AD-335 Macro

18k Yellow Gold 3.5ct Cushion Lab Created Diamond Solitaire Engagement Ring Ada Diamonds Design AD-335 Profile

3.25 ct Lab Diamonds Cushion Classic Four Prong Solitaire Diamond Engagement Ring in 14k Yellow Gold (Side View)

1 Carat Cushion Solitaire Engagement Ring with Lab Diamond Ada Diamonds Design AD-335 on Model

1.5ct cushion cut lab diamond in classic four prong solitaire

1.75ct cushion cut lab diamond in classic four prong solitaire

White and Rose Gold 2 Carat Cushion Cut Lab Diamond Solitaire Engagement Ring Ada Diamonds Design AD-335 on Model

2.25ct cushion cut lab diamond in classic four prong solitaire

2.5ct cushion cut lab diamond in classic four prong solitaire

2.75ct cushion cut lab diamond in classic four prong solitaire

Yellow Gold Cushion Classic Four Prong Solitaire Diamond Engagement Ring featuring Exceptional Quality 3.25 ct Lab Grown Diamonds (Main View)

Platinum 3.5 Carat Cushion Cut Lab Diamond Solitaire Engagement Ring Ada Diamonds Design AD-335 on Model

18k Yellow Gold 3ct Cushion Lab Created Diamond Solitaire Engagement Ring Ada Diamonds Design AD-335 on Model

White Gold Cushion Classic Four Prong Solitaire Diamond Engagement Ring featuring High Quality 1.5 ct Synthetic Diamonds (Profile View)

"Exclusive 1.5 ct Cushion Cut Solitaire Diamond Engagement Ring in 14k Yellow Gold - Profile View Showcase"

Platinum Cushion Classic Four Prong Solitaire Diamond Engagement Ring featuring 3.5 Carat Diamonds (Main View)

"Unveiling the 3.5 ct Lab-Grown Diamond: Platinum Cushion Classic Four Prong Solitaire Engagement Ring"

Cushion Classic Four Prong Solitaire Diamond Engagement Ring featuring Exceptional Quality 3.5 ct Lab Diamonds (Profile View)

"Unveiling the 3.5 ct Cushion Classic Four Prong Solitaire Diamond Engagement Ring in Platinum - Profile View"

Your Choice of Gold: $1,250 USD Platinum &amp; Two-Tone: $1,500 USD Pricing is for setting only - center stone priced separately.

Elegant and timeless, this setting features four prongs for maximum security. Customize your lab diamond solitaire engagement ring with band widths of 1.8-2.5mm.

Cushion Classic Four Prong Solitaire

Classic Solitaires

Custom made-to-order solitaire engagement 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.