Marquise Cut Lab Grown Diamond Three-Stone Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

1 of 8

$834.00

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 · 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	Details
Center Diamond	Marquise Cut · 10.00 × 5.00 mm · Approx. 1.00 ct
Side Diamonds	2 Kite Cut Lab Grown Diamonds · 4.20 × 2.60 mm each · Approx. 0.22 ct total
Total Diamond Weight	Approx. 1.22 ct · 3 Stones
Stone Type	Lab Grown Diamond
Setting	Six-Prong Basket with Kite Side Diamonds
Finish · Occasion	High Polish · Engagement, Wedding

At a glance

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

A 10.00 × 5.00 mm marquise center diamond weighing approximately 1.00 ct is framed by two kite cut lab grown diamonds totaling approximately 0.22 ct. Approximate total diamond weight is 1.22 ct.

Made to order in 11 metal options including Silver, 9K, 14K and 18K Yellow, White and Rose Gold, plus Platinum.

The marquise center is secured by a six-prong basket that supports both pointed tips while keeping the long outline open to the light. The basket lifts the diamond just enough for the pavilion to remain visible without making the ring feel tall on the finger.

Two kite cut side diamonds continue the taper of the marquise, creating a balanced three-stone silhouette that flows naturally into the slim comfort shank. The polished band keeps the attention on the diamond arrangement while remaining comfortable for everyday wear. Signora Jewels makes every ring to order in your selected precious metal.

Design Highlights

1.00 ct marquise cut lab grown diamond center
Two kite cut side diamonds totaling approximately 0.22 ct
Six-prong basket setting
Plain comfort shank
Open gallery beneath the center stone
Approximate total diamond weight of 1.22 ct

Browse more Three-Stone Rings, learn about diamond shapes in our Diamond Guide, or compare precious metals using our Metal Guide.

About Lab Grown Diamonds

The marquise cut creates long flashes of light while visually elongating the finger. Matching kite cut side diamonds echo the pointed ends of the center stone, giving the ring a continuous, symmetrical profile.

Metal, Care & Fit

Available in Silver, 9K, 14K and 18K Yellow, White and Rose Gold, plus Platinum. Clean the basket and the spaces beneath the 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 secure both pointed ends of the marquise while providing additional support along the sides of the diamond.

What do the kite side diamonds add to the design?
Their pointed shape follows the outline of the marquise center, creating a smooth transition from the center stone to the band.

Can this ring be worn every day?
Yes. The six-prong basket and plain comfort shank are designed for regular wear while keeping the three-stone arrangement secure.

Will a wedding band sit flush with this ring?
The raised basket allows many straight wedding bands to sit close, although a slight gap may remain depending on the band profile.

Common questions

Ring questions, answered

Timing, shipping, certification and return eligibility for made-to-order rings.

Still deciding? Talk to a Signora jeweler — free, and no obligation. Book a consultation →

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.

Your cart is empty