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.

High Quality 1.5 Carat Lab Diamonds set in Yellow Gold Round Single Halo Setting (Main View)

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

Asscher Single Halo Setting

Cushion Single Halo Setting

Emerald Single Halo Setting

Oval Single Halo Setting

Pear Single Halo Setting

Princess Single Halo Setting

Radiant Single Halo Setting

Halo-000

Halo-001

Halo-002

Halo-003

Halo-004

Halo-005

Halo-006

High Quality Diamonds set in White Gold Round Single Halo Setting (Main View)

Lab Diamonds Round Single Halo Setting in White Gold (Main View)

Diamonds set in White Gold Round Single Halo Setting (Profile View)

Man Made Diamonds Round Single Halo Setting in White Gold (Profile View)

Lab Grown Diamonds set in White Gold Round Single Halo Setting (Profile View)

Exceptional Quality Lab Created Diamonds set in White Gold Round Single Halo Setting (Profile View)

Lab Diamonds set in White Gold Round Single Halo Setting (Side View)

18k White Gold Round Single Halo Diamond Engagement Ring 2.0ctw Side View - AD-073

White Gold Round Single Halo Setting featuring High Quality Man Made Diamonds (Side View)

Synthetic Diamonds Round Single Halo Setting in White Gold (Side View)

Lab Grown Diamonds set in Yellow Gold Round Single Halo Setting (Main View)

Diamonds set in Yellow Gold Round Single Halo Diamond Engagement Ring (Main View)

Lab Diamonds set in Yellow Gold Round Single Halo Setting (Main View)

Exceptional Quality Lab Grown Diamonds Round Single Halo Diamond Engagement Ring in Yellow Gold (Main View)

Synthetic Diamonds set in Rose Gold Round Single Halo Setting (Main View)

Exceptional Quality Lab Grown Diamonds set in Rose Gold Round Single Halo Diamond Engagement Ring (Main View)

Rose Gold Round Single Halo Setting featuring High Quality Diamonds (Main View)

Diamonds Round Single Halo Setting in Rose Gold (Main View)

High Quality Lab Grown Diamonds set in Platinum & Yellow Gold Round Single Halo Setting (Main View)

High Quality Lab Grown Diamonds Round Single Halo Setting in Platinum & Yellow Gold (Main View)

Platinum & Yellow Gold Round Single Halo Diamond Engagement Ring featuring Diamonds (Profile View)

Diamonds Round Single Halo Diamond Engagement Ring in Platinum & Yellow Gold (Profile View)

Diamonds Round Single Halo Setting in Platinum & Yellow Gold (Profile View)

Exceptional Quality Lab Grown Diamonds Round Single Halo Diamond Engagement Ring in Platinum & Yellow Gold (Profile View)

Platinum & Rose Gold Round Single Halo Setting featuring Exceptional Quality Diamonds (Main View)

Man Made Diamonds set in Platinum & Rose Gold Round Single Halo Setting (Main View)

Exceptional Quality Man Made Diamonds set in Platinum & Rose Gold Round Single Halo Diamond Engagement Ring (Profile View)

Lab Diamonds Round Single Halo Diamond Engagement Ring in Platinum & Rose Gold (Profile View)

Lab Grown Diamonds Round Single Halo Setting in Platinum & Rose Gold (Main View)

Platinum & Rose Gold Round Single Halo Diamond Engagement Ring featuring Lab Diamonds (Main View)

Platinum & Rose Gold Round Single Halo Diamond Engagement Ring featuring Hand Selected Lab Diamonds (Profile View)

Hand Selected Lab Diamonds Round Single Halo Setting in Platinum & Rose Gold (Profile View)

Platinum 1.75ct Round Lab Diamond Ring with a Halo Ada Diamonds Design AD-073 in Box

white gold 1.75ct round lab diamond in single halo engagement ring ada diamonds design ad 073 profile view

18k white gold 2.5 carat round man made diamond single halo engagement ring ada diamonds design ad 073 main

platinum single halo engagement ring with 2.5ct round lab diamond ada diamonds design ad 073 macro

platinum 2.5 carat round lab created diamond engagement ring with halo ada diamonds design ad 073 profile view

yellow gold round single halo engagement ring with manmade diamond ada diamonds design ad073

1.75 ctw Diamonds Round Single Halo Setting in Yellow Gold (Profile View)

18k White Gold Round Halo Lab Diamond Engagement Ring Ada Diamonds Design AD-073 Artistic

Platinum 1 Carat Round Lab Grown Diamond with Halo Engagement Ring Ada Diamonds Design AD-073 Macro

White Gold Halo Engagement Ring with 1 Carat Round Lab Diamond Ada Diamonds Design AD-073 on Model

Platinum 1.5 Carat Round Man Made Diamond Halo Engagement Ring Ada Diamonds Design AD-073 on Hand

18k White Gold 2ct Round Lab Created Diamond Halo Engagement Ring Ada Diamonds Design AD-073 on Model

1.5 Carat Lab Grown Diamonds set in Platinum Round Single Halo Setting (Main View)

Yellow Gold Round Single Halo Diamond Engagement Ring featuring 1.75 Carat Man Made Diamonds (Main View)

platinum 2.5 ct round lab diamond single halo engagement ring ad diamonds design ad073 on model

2.5 ctw Diamonds set in Platinum Round Single Halo Setting (Main View)

Elegant 2.5 Carat Platinum Diamond Engagement Ring in Round Single Halo Setting in Platinum - AD-073

2.5 Carat Lab Created Diamonds set in Platinum Round Single Halo Setting (Profile View)

2.5ctw Round Single Halo Engagement Ring in Platinum

Exceptional Quality 1.75 Carat Diamonds set in Yellow Gold Round Single Halo Diamond Engagement Ring (Main View)

1.75ctw Round Single Halo Engagement Ring in 14k Yellow Gold

Your Choice of Gold: 1.1mm Halo Stones: $2,250 USD1.2mm Halo Stones: $2,300 USD1.3mm Halo Stones: $2,350 USD1.5mm Halo Stones: $2,450 USD2.0mm Halo Stones: $2,650 USD2.2mm Halo Stones: $2,800 USD2.4mm Halo Stones: $2,950 USD Starting at price is for the setting only (center stone priced separately) and includes DEF/VS lab grown diamonds. Platinum &amp; two-tone available for an additional $300 fee. Total carat weights are approximate.

Simple yet beautiful, this setting features a single halo of lab diamonds. Customize your ring with band widths from 1.8-2.5mm.

Single Halo

Round Single Halo Setting

Custom made-to-order round halo 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 San Francisco, New York, and Austin TX.