Radiant Cut Three Stone Lab Grown Diamond Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

Gold ring with three large diamonds on a white background

1 of 11

$1,292.00

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. 2 ct lab-grown diamond · IGI report · Signora Certificate included.

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Center Diamond:

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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

Radiant Cut · Three Stone

Center

Radiant Cut

Carat

2.5 ct

Customizable

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.

Each metal color is shown in the photos — pick your center size and metal in the options on this page.

Detail	In the photos	Customizable
Center diamond	Radiant · 4.91 ct	Yes — 1 to 4.5 ct
Metal & color	Every color shown	Yes — 11 options
Side stones	4 diamonds · approx. 1.70 ct	Included as shown
Total diamond weight	Approx. 6.61 ct	Varies with center size
Stone type	Lab Grown Diamond	Lab grown or natural

Made to order — the price updates with your selection. Want fully bespoke?
Customize your jewelry here.

This radiant lab grown diamond engagement ring is designed to make an unforgettable first impression. A bold radiant-cut center stone is framed by tapered side diamonds that draw the eye inward, creating exceptional finger coverage and a balanced three-stone silhouette.

The clean geometry of the radiant cut pairs beautifully with the architectural side stones, giving the ring a refined presence from every angle. Six secure prongs hold the center while the elevated setting allows light to enter freely for maximum brilliance.

Made to order in your chosen metal and center size, this design combines statement-making scale with everyday wearability. It is crafted to celebrate a milestone moment while remaining timeless enough for a lifetime of wear.

Design highlights

Radiant-cut lab grown diamond center stone
Classic three-stone engagement ring design
Two radiant side diamonds and two tapered baguette side diamonds
Six-prong center setting for security
Strong finger coverage with balanced proportions
Open gallery allows light to enter the diamonds
High-polish finish for lasting shine
Customizable center size from 1 CT to 4.5 CT with 11 metal options

The combination of a radiant center, matching radiant side stones, and tapered baguettes creates a layered play of brilliance and clean lines. From a distance it feels bold and glamorous; up close, the carefully balanced proportions reveal the craftsmanship behind the design.

Diamond Details

Specification	Details
Center Stone Shape	Radiant Cut
Center Stone Size	10.50 × 8.50 mm
Center Stone Weight (as shown)	Approx. 4.91 CT
Side Diamonds	2 Radiant Diamonds · Approx. 1.45 CT Total
Tapered Baguette Diamonds	2 Diamonds · Approx. 0.25 CT Total
Total Diamond Weight	Approx. 6.61 CT
Total Diamond Count	5
Stone Type	Lab Grown Diamond
Setting	Six-Prong Three Stone Setting

Measurements are approximate; your chosen size sets the final center weight.

Ring Specifications

Feature	Details
Ring Style	Three Stone
Metal Options	Silver, 9K, 14K, 18K Gold, Platinum
Available Colors	Yellow Gold, White Gold, Rose Gold, Silver, Platinum
Setting Type	Six-Prong Three Stone
Finish	High Polish
Occasion	Engagement, Anniversary, Bridal

About Lab Grown Diamonds

A radiant marries an emerald's trimmed-corner outline with brilliant faceting, so it throws lively sparkle while keeping a bold rectangular footprint. The cropped corners are structurally tough and seat securely in prong or halo settings.

Every Signora Jewels diamond is grown in a controlled lab using the CVD process, producing a stone that is chemically, optically, and physically identical to a mined diamond — same hardness, same fire, graded on the same 4C scale. Because the supply chain is short and traceable, you get a larger, cleaner stone for the same budget and a documented origin, with no mining footprint. The result is a diamond that looks and tests exactly as a natural one, with more carat and clarity for your money.

FAQ

Can I change the center stone size?
Yes. Center sizes from 1 CT to 4.5 CT are available, and the setting is scaled to suit the stone you choose.

Are lab grown diamonds real diamonds?
Yes. Lab grown diamonds are chemically, physically, and optically identical to mined diamonds and are graded on the same 4C scale.

What side stones are included?
The design includes two radiant-cut side diamonds and two tapered baguette diamonds, creating a dramatic three-stone presentation.

Will the ring keep its sparkle over time?
Yes. Lab grown diamonds are a 10 on the Mohs hardness scale and will maintain their brilliance for generations with normal care.

Which metals can I choose?
Silver, 9K / 14K / 18K gold in yellow, white or rose, and Platinum.

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