Regal Marquise Lab Grown Diamond Solitaire Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

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$994.00

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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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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 Old Mine Cut Lab Grown Diamond · 13.50 × 7.20 mm · Approx. 3.00 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. 3.00 ct (Reference)	Varies with selected center diamond
Stone Type	Lab Grown Diamond	—
Setting	Four-Prong Cathedral Basket Solitaire with Wide Comfort Shank	—
Finish	High Polish	—
Occasion	Engagement · Anniversary · Bridal	—

At a glance

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

The reference design showcases an approximately 3.00 ct Marquise Old Mine Cut lab grown diamond secured within a classic four-prong cathedral basket. A wide comfort shank balances the elongated center stone while creating a bold, contemporary 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 Marquise Old Mine Cut center is elevated within a cathedral basket that allows generous light to pass through the open gallery while protecting each pointed tip. The elongated proportions create exceptional finger coverage and an elegant profile from every angle.

A wide comfort shank provides visual balance for the substantial center diamond while offering a confident, comfortable fit. Free from accent stones, every element of the design is dedicated to showcasing the distinctive beauty of the marquise center. Every ring is handcrafted to order by Signora Jewels.

Design Highlights

Customizable Marquise Old Mine Cut Lab Grown Diamond from 1 ct to 4.5 ct
Four-prong cathedral basket
Wide comfort shank
Open gallery construction
Classic solitaire design
High polish finish

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

Diamond Details

Specification	Details
Reference Center Diamond	Marquise Old Mine Cut Lab Grown Diamond · 13.50 × 7.20 mm · Approx. 3.00 ct
Accent Diamonds	None
Total Stones	1
Reference Total Diamond Weight	Approx. 3.00 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 Old Mine Cut combines elongated elegance with distinctive faceting that emphasizes both brilliance and character. The clean solitaire setting allows the center diamond to remain the unmistakable focal point while the wide comfort shank provides modern balance.

Metal, Care & Fit

Available in Silver, 9K, 14K and 18K Yellow, White and Rose Gold, plus Platinum. Clean beneath the cathedral basket with warm water, mild soap and a soft brush to maintain brilliance and preserve the polished finish.

FAQ

Why does this ring use a wide comfort shank?
The broader shank balances the larger marquise center while providing a comfortable fit and a substantial feel.

Can I choose a different center diamond size?
Yes. This design is available with center diamond sizes from 1 ct through 4.5 ct.

How does the cathedral basket benefit the center diamond?
The cathedral basket securely supports the marquise diamond while allowing light to enter through the open gallery for enhanced brilliance.

Is this solitaire suitable for everyday wear?
Yes. The four-prong cathedral basket and wide comfort shank are designed to provide lasting security and comfortable daily wear.

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