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Regal Marquise Lab Grown Diamond Solitaire Engagement Ring
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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
CustomizableMetal
CustomizableSetting
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.
Common questions
Ring questions, answered
Timing, shipping, certification and return eligibility for made-to-order rings.
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Answers last updated August 2, 2026
When will my order ship?
Standard listed pieces are made to order with an estimated dispatch of 7 business days. Use the product-page estimate when it is more specific and the timing confirmed after ordering. Delivery timing begins after dispatch and varies by destination and carrier service. Fully custom commissions follow the production schedule confirmed with their approved specifications or CAD.
When is insured worldwide delivery free?
Orders of US$500 or more receive free express, insured and tracked worldwide delivery. Below US$500, express, insured and tracked worldwide delivery is charged at the fixed rate shown at checkout.
Will I have to pay import duties?
For every destination available at checkout, Signora prepays applicable import duties and import taxes. Customers should not be asked to pay those import charges again on delivery.
What certificate comes with my jewelry?
Every finished piece includes a Signora Jewelry Certificate. Each selected individual lab-grown center or primary diamond of 0.50 ct or above includes an IGI grading report. Below 0.50 ct, IGI can be arranged by custom request. Custom moissanite and gemstone selections include GRA documentation, with the exact scope confirmed in the approved specifications. The product page or approved specifications state the exact laboratory, report type and scope.
Can I return a made-to-order listed design?
Standard listed products are eligible for return within 30 days after carrier-recorded delivery when unworn, unused and in their original condition, with the original packaging and included documents. Normal listed choices such as metal, stone carat, chain or bracelet length, an extended ring size, or complimentary engraving do not by themselves make an item Final Sale. A sale or discount also does not imply Final Sale; only an item explicitly classified as Final Sale follows the non-returnable exclusion.
How are fully custom orders handled?
A fully custom commission is different from a listed made-to-order design. After its specifications or CAD are approved, a normal change-of-mind return does not apply. Manufacturing defects remain reviewable. Signora may accept an exceptional non-defect return case by case; documented labor and genuinely non-recoverable costs may be deducted, but these deductions are not a restocking fee.