Marquise Lab Grown Diamond Three-Stone Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

1 of 7

$865.00

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Independently graded by IGI IGI Report Included Selected 0.50 ct+ lab-grown center or primary diamond · IGI grading report · Signora Jewelry Certificate included. 1 ct lab-grown diamond · IGI report · Signora Certificate included.

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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

Marquise Cut · Three Stone

Center

Marquise Cut

Carat

1 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.

Detail	In the Photos	Customizable
Center Diamond	Marquise Rose Cut · 10.50 × 5.30 mm · Approx. 1.00 ct	1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct, 4.5 ct
Side Diamonds	2 Pear Cut Diamonds · Approx. 0.20 ct total	Scaled to suit the selected center size
Total Diamond Weight	Approx. 1.20 ct	Varies with selected center size
Stone Type	Lab Grown Diamond	—
Setting	Six-Prong Basket with Pear Side Diamonds	—
Finish · Occasion	High Polish · Engagement, Anniversary, Bridal	—

At a glance

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

The ring shown features a 10.50 × 5.30 mm marquise rose cut lab grown diamond weighing approximately 1.00 ct. Two pear cut side diamonds total approximately 0.20 ct, bringing the total diamond weight to approximately 1.20 ct.

Made to order in 11 metals: 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 marquise center is held in a six-prong basket that protects both pointed tips while leaving the elongated outline open to view. The basket keeps the diamond elevated just enough for light to enter beneath the stone while maintaining a balanced profile. The rose cut creates broad reflections that emphasize the long silhouette of the marquise.

Two pear cut side diamonds taper naturally toward the band, adding brilliance without competing with the center. Their rounded ends face outward while the pointed tips lead the eye toward the marquise, creating a smooth transition into the plain comfort shank. Signora Jewels makes every ring to order in your selected precious metal and center diamond size.

Design Highlights

Customizable marquise rose cut lab grown diamond from 1 ct to 4.5 ct
Six-prong basket setting
Two pear cut side diamonds totaling approximately 0.20 ct
Open gallery beneath the center stone
Plain comfort shank
High polish finish

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

Diamond & Ring Details

Specification	Details
Center Diamond	Marquise Rose Cut · 10.50 × 5.30 mm · Approx. 1.00 ct (shown)
Side Diamonds	2 Pear Cut Diamonds · Approx. 0.20 ct total
Total Stones	3
Total Diamond Weight	Approx. 1.20 ct
Center Diamond Options	1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct and 4.5 ct
Finish	High Polish

Measurements are approximate. Final dimensions vary according to the selected center diamond size.

About Lab Grown Diamonds

The marquise rose cut combines an elongated outline with large, open facets that create broad flashes of light. The pear side diamonds mirror the flowing shape of the center while preserving the balanced proportions of this three-stone design.

Metal, Care & Fit

Available in Silver, 9K, 14K and 18K Yellow, White and Rose Gold, plus Platinum. Clean beneath the basket and around the pear side diamonds with warm water, mild soap and a soft brush to maintain maximum brilliance.

FAQ

Why does this ring use six prongs?
Six prongs support the marquise diamond at both pointed ends and along its sides, helping protect the elongated shape during everyday wear.

Can I choose a different center diamond size?
Yes. This design is available with center diamond sizes from 1 ct through 4.5 ct while maintaining the same three-stone style.

What do the pear side diamonds add?
The pear side diamonds soften the transition into the band while complementing the elongated silhouette of the marquise center.

Is this ring comfortable for daily wear?
Yes. The plain comfort shank and open basket provide a balanced fit while keeping the center stone securely supported.

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