Serene Round Lab Grown Diamond Three-Stone Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

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$669.00

Price updates with your selections

Independently graded by IGI IGI Report Included Selected 0.50 ct+ lab-grown center or primary diamond · IGI grading report · Signora Jewelry Certificate included. 0.5 ct lab-grown diamond · IGI report · Signora Certificate included.

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Forever, A & J

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Complimentary · hand-engraved to order · adds about 3–4 days.

Estimated dispatch: 7 business days Duties & taxes prepaid

Ring size guide

Lay a ring you own flat on the circle and slide until it sits just inside it — or set its inner diameter directly.

Measure the inside of a ring that already fits — inner edge to edge — with a ruler in mm, then set it below. No ring handy? Try Measure your finger.

14 mm 24 mm 17.3 mm

Inner diameter mm

US size

UK size

EU size

Circumference

54.3 mm

Between sizes? Always choose the larger size. Fingers are slightly bigger in the evening — measure then for the best fit.

Method 1 — Use an existing ring

Find a ring that fits the intended finger comfortably.
Place it flat and measure the inner diameter (inside edge to inside edge) in mm.
Enter that measurement in the Measure a ring tab.

Method 2 — Wrap and measure

Wrap a thin strip of paper around the base of your finger.
Mark where it overlaps — measure that length in mm (your circumference).
Divide by 3.1416 (π) to get your diameter, then use the Measure a ring tab.

Tip: Middle finger sizes typically run half a size larger than the ring finger. If between sizes, go up. Measure in the evening — fingers are slightly larger then.

7US size

US	UK	EU	Diameter	Circumference

Highlighted row = your converted size. Most common women's sizes are US 6–7. All measurements in mm.

Selected: —

The Signora Promise

Hand-finished in SuratMade to order

Reports where statedExact scope shown

Insured deliverySigned & tracked

Secure checkoutShopify checkout

Standard-design returns30-day eligibility

Final inspectionChecked before dispatch

About This Ring

Round Brilliant · Three Stone

Center

Round Brilliant

Metal

Customizable

Setting

Three Stone

An independent IGI grading report is included when the selected individual lab-grown center or primary diamond is 0.50 ct or larger.

Detail	In the Photos	Customizable
Center Diamond	Round Brilliant · Approx. 5.10 mm · Approx. 0.50 ct (Reference Model)	1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct, 4.5 ct
Side Diamonds	2 Round Brilliant Lab Grown Diamonds · Approx. 0.24 ct Total	Scaled to match the selected center diamond
Total Diamond Weight	Approx. 0.74 ct (Reference Model)	Varies with selected center diamond
Stone Type	Lab Grown Diamond	—
Setting	Three-Stone Cathedral Basket Setting with Flowing Bypass Shank	—
Finish	High Polish	—
Occasion	Engagement · Anniversary · Bridal	—

At a glance

A round lab grown diamond three-stone engagement ring from Signora Jewels.

The reference ring shown features a 5.10 mm round brilliant lab grown diamond weighing approximately 0.50 ct. Two round brilliant side diamonds totaling approximately 0.24 ct complete the elegant three-stone design. Your ring is custom made with your selected center diamond size from 1 ct to 4.5 ct.

Made to order in Silver, 9K, 14K and 18K Yellow, White and Rose Gold, plus Platinum.

Select your preferred center diamond size and precious metal using the options on this page.

The round brilliant center diamond is elevated within a cathedral basket that allows generous light to enter through the open gallery, enhancing brilliance from every viewing angle. Smooth bypass shoulders sweep naturally toward the center, creating graceful movement while maintaining a timeless three-stone profile.

Matching round brilliant side diamonds add balanced sparkle and proportion to the center stone without overwhelming it. The polished comfort shank gives the ring a refined appearance that transitions effortlessly from everyday wear to formal occasions. Signora Jewels handcrafts every ring to order in your selected precious metal.

Design Highlights

Customizable round lab grown diamond from 1 ct to 4.5 ct
Classic three-stone design
Flowing bypass shank
Cathedral basket setting
Open gallery construction
High polish finish

Browse our Three-Stone Engagement Rings, explore the Engagement Ring Guide, or compare precious metals using our Metal Guide.

Diamond Details

Specification	Details
Reference Center Diamond	Round Brilliant · Approx. 5.10 mm · Approx. 0.50 ct
Side Diamonds	2 Round Brilliant · Approx. 0.24 ct Total
Total Stones	3
Reference Total Diamond Weight	Approx. 0.74 ct
Available Center Sizes	1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct and 4.5 ct
Finish	High Polish

The measurements shown are for the photographed reference model. Final dimensions vary according to the selected center diamond size.

About Lab Grown Diamonds

The round brilliant cut delivers exceptional brilliance and balanced proportions. Combined with matching round side diamonds and an elegant bypass profile, this design offers a timeless three-stone engagement ring with graceful symmetry.

Metal, Care & Fit

Available in Silver, 9K, 14K and 18K Yellow, White and Rose Gold, plus Platinum. Clean beneath the cathedral basket and around the side diamonds with warm water, mild soap and a soft brush to keep every diamond bright.

FAQ

Can I customize the center diamond?
Yes. This design is available with center diamond sizes from 1 ct to 4.5 ct.

Do the side diamonds change with larger center stones?
Yes. The side diamonds are proportionally scaled to maintain the balance of the three-stone design.

Why is the center mounted in a cathedral basket?
The cathedral basket provides excellent support while allowing more light to enter through the open gallery for added brilliance.

Is this ring comfortable for everyday wear?
Yes. The flowing bypass shank and polished comfort profile are designed for lasting daily comfort while showcasing the center diamond.

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