Marquise Lab Grown Diamond Geometric Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

1 of 9

$840.00

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

Understand your certificates →Certificate details →

Metal:

Center Diamond:

Choose your fit

Ring size Choose one

Forever, A & J

Live preview

Engraving 0 / 20

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 · Solitaire

Center

Marquise Cut

Carat

1 ct

Customizable

Metal

Customizable

Setting

Solitaire

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 Brilliant · 10.20 × 5.37 × 3.28 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
Accent diamonds	None	—
Total diamond weight	Approx. 1.00 ct	Varies with center size
Stone type	Lab Grown Diamond	—
Setting	Six-Prong Open Cathedral Basket with Geometric Split Shank	—
Finish · Occasion	High Polish · Engagement, Anniversary, Bridal	—

At a glance

A marquise lab grown diamond geometric engagement ring from Signora Jewels.

An approximately 1.00 ct marquise brilliant measuring 10.20 × 5.37 × 3.28 mm is secured in a six-prong cathedral basket within a geometric kite-shaped split shank.

Made to order in 11 metals: Silver, 9K/14K/18K Gold (Yellow, White and Rose) and Platinum.

Each metal color is shown in the photos. Choose your preferred center diamond weight and metal from the options on this page.

The elongated marquise brilliant is framed by an open kite-shaped split shank that creates clean geometric lines around the center without enclosing it. At Signora Jewels, six prongs secure the pointed tips and curved sides while the cathedral basket lifts the diamond above the band, allowing the full outline to remain visible.

The approximately 1.90 mm comfort-fit shank widens into the geometric frame before narrowing beneath the basket, giving the ring a balanced architectural profile. With an approximate setting height of 6.10 mm, the open gallery allows light beneath the diamond while keeping the design comfortable for everyday wear.

Browse our engagement rings, compare diamond shapes in the diamond stone guide, or explore precious metal options in our metal guide.

Design highlights

Marquise brilliant center shown at approximately 1.00 ct
Customizable center diamond from 1 ct to 4.5 ct
Six-prong cathedral basket
Geometric kite-shaped split shank
Open gallery beneath the center diamond
Comfort-fit band approximately 1.90 mm wide

The open kite frame creates strong geometric symmetry while leaving the marquise completely visible from every direction. Instead of using accent diamonds, the polished metal lines become the defining feature of the design.

Diamond & Ring Details

Specification	Details
Center stone	Marquise Brilliant · 10.20 × 5.37 × 3.28 mm · approx. 1.00 ct (shown)
Accent stones	None
Total weight / count	Approx. 1.00 ct · 1 Diamond
Setting	Six-Prong Open Cathedral Basket with Geometric Split Shank
Center 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. Your selected center diamond weight determines the final proportions of the finished ring.

About Lab Grown Diamonds

The marquise brilliant combines pointed ends with brilliant-cut facets to create lively sparkle and impressive finger coverage. Every center diamond is F color, VS1 clarity and , selected to complement the proportions of this geometric cathedral design.

Metal, Care & Fit

Available in Silver, 9K, 14K and 18K Yellow, White and Rose Gold, plus Platinum. Clean beneath the open cathedral basket using warm water, mild soap and a soft brush to remove everyday buildup. Inspect the six prongs regularly to ensure both pointed ends remain securely protected.

FAQ

What makes the kite-shaped frame different from a traditional split shank?
The split shoulders meet above and below the center stone to create a complete geometric outline. This gives the ring a bold architectural appearance while keeping the center fully visible.

Why does this marquise use six prongs?
The additional prongs secure both pointed tips and support the curved sides of the diamond. This provides extra protection while maintaining an open view of the stone.

Can this ring be worn with a wedding band?
Yes. The cathedral basket allows many straight wedding bands to sit close, while contoured bands can follow the raised profile more precisely.

Which metal color best complements this design?
White gold and platinum emphasize the crisp geometric lines, while yellow and rose gold create warm contrast around the elongated marquise center.

Your cart is empty