Luna Marquise Lab Grown Diamond Solitaire Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

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$809.00

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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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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

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	Reference Design	Customizable
Center Diamond	Marquise Cut Lab Grown Diamond · 10.50 × 5.30 mm · Approx. 1.00 ct (Reference)	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 (Reference)	Varies with selected center diamond
Stone Type	Lab Grown Diamond	—
Setting	Six-Prong Cathedral Basket with Knife Edge Shank	—
Finish	High Polish	—

At a glance

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

The reference design showcases an approximately 1.00 ct marquise cut lab grown diamond secured in a refined six-prong cathedral basket. A slim knife edge shank and open gallery keep the attention on the elongated center stone while creating an elegant everyday silhouette.

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 six-prong basket protects each pointed tip while supporting the marquise diamond with balanced symmetry. The elevated cathedral profile allows light to enter beneath the stone, enhancing brilliance and emphasizing the graceful proportions of the elongated cut.

A polished knife edge shank narrows toward the center to create a refined transition into the basket. Free from additional accent stones, every line of the design is focused on highlighting the marquise diamond with timeless simplicity. Every ring is individually handcrafted by Signora Jewels.

Design Highlights

Customizable marquise lab grown diamond from 1 ct to 4.5 ct
Six-prong cathedral basket
Knife edge comfort shank
Open gallery construction
Minimalist solitaire profile
High polish finish

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

Diamond Details

Specification	Details
Reference Center Diamond	Marquise Cut Lab Grown Diamond · 10.50 × 5.30 mm · Approx. 1.00 ct
Accent Diamonds	None
Total Stones	1
Reference Total Diamond Weight	Approx. 1.00 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 represent the photographed reference model. Final proportions vary according to the selected center diamond.

About Lab Grown Diamonds

The marquise cut offers exceptional finger coverage with elegant pointed ends and brilliant faceting. Combined with the cathedral basket and knife edge band, this solitaire delivers a clean, refined appearance that remains timeless.

Metal, Care & Fit

Clean beneath the cathedral basket using warm water, mild soap and a soft brush to maintain brilliance. The polished knife edge profile is comfortable for everyday wear and pairs beautifully with a wide variety of wedding bands.

FAQ

Why does this ring use six prongs?
Six prongs provide added protection for the pointed ends of the marquise diamond while maintaining excellent light performance.

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

What is a knife edge shank?
A knife edge shank features a raised center ridge that gives the ring a refined profile while keeping the band visually slim.

Will a wedding band sit beside this ring?
The cathedral profile pairs well with many straight or gently contoured wedding bands, depending on your preferred fit.

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