Round Lab Grown Diamond Marquise & Round Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

round diamond marquise side-stone ring in yellow gold

1 of 12

$596.00

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.

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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

Round Brilliant ·

Center

Round Brilliant

Carat

1 ct

Customizable

Metal

Customizable

Setting

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
Ring style	Marquise and round side-stone engagement ring	Included as shown
Center diamond	Round · 10.00 mm · approx. 3.50 ct	Yes — 1 to 4.5 ct
Marquise accents	2 diamonds · 5.00 × 2.50 mm · approx. 0.300 ct	Included and scaled to the center
Round accents	2 diamonds · 2.00 mm · approx. 0.070 ct	Included and scaled to the center
Total diamond weight	Approx. 3.870 ct · 5 diamonds	Varies with center size
Stone type	Lab Grown Diamond	Lab Grown Diamond
Setting	Four-prong center with prong-set marquise and round side stones	Scaled to suit the selected center
Metal & color	Rose gold shown	Yes — 11 options
Finish	High Polish	Included
Occasion	Engagement, Anniversary	—

Diamond details

Shape	Size	Qty	Weight (approx.)
Round center	10.00 mm	1	3.500 ct
Marquise accents	5.00 × 2.50 mm	2	0.300 ct
Round accents	2.00 mm	2	0.070 ct
Total	—	5	3.870 ct

At a glance

A round Lab Grown Diamond marquise and round side-stone engagement ring from Signora Jewels.

As shown: a 3.50 ct, 10.00 mm round center with two marquise and two round accents totaling approx. 0.370 ct.

Five Lab Grown Diamond stones total approx. 3.870 ct in the photographed configuration.

Made to order in silver, 9K/14K/18K yellow, white or rose gold, and platinum.

Made to order — the price updates with your selection. Change the center size or side-stone proportions through our custom jewelry service.

Signora Jewels sets the 10.00 mm round center between two marquise diamonds, each turned lengthwise along the shoulder. A smaller 2.00 mm round sits beyond each marquise, stepping the sparkle down before the plain band begins.

Four prongs hold the center clear of the side stones. The marquise points draw the eye outward, giving the 3.50 ct center more spread without placing a halo around it.

The open basket lifts the diamond above the shank, while the side stones sit close to the finger. From the front, you see one broad round flash followed by two narrower points of light.

Design highlights

Round Lab Grown Diamond center, approx. 3.50 ct as shown
Approx. 10.00 mm center diameter
Four-prong center setting
Two marquise accents totaling approx. 0.300 ct
Two round accents totaling approx. 0.070 ct
Graduated five-stone arrangement
Approx. 3.870 ct total diamond weight as shown
Made to order in 11 metal and color combinations

The marquise diamonds form the bridge between the large round center and the smaller outer rounds. That change in shape breaks up the shoulder line and keeps the five stones visually separate.

Diamond & Ring Details

Specification	Details
Center stone	Round · 10.00 mm · approx. 3.50 ct as shown
Marquise side stones	2 diamonds · 5.00 × 2.50 mm · approx. 0.300 ct
Round side stones	2 diamonds · 2.00 mm · approx. 0.070 ct
Total diamond weight	Approx. 3.870 ct across 5 diamonds as shown
Center setting	Four-prong basket
Accent setting	Individual prong settings
Reference size	US 7
Finish	High Polish

Measurements and weights are approximate. The basket and metal weight scale with the center size selected.

About Lab Grown Diamonds

A round brilliant uses 57–58 facets to return light toward the eye. The marquise side stones stretch brilliant-style sparkle into pointed outlines, while the smaller rounds finish the graduation toward the band.

Lab grown diamonds have the same carbon crystal structure, hardness and optical properties as mined diamonds. They are graded using the same cut, color, clarity and carat standards.

Metal, Care & Fit

Choose silver, 9K/14K/18K gold in yellow, white or rose, or platinum. 9K contains more strengthening alloy for daily wear, while 18K has higher gold content and richer color; compare them in the metal guide.

Order in your known US size. The five-stone spread covers more of the finger than a plain solitaire, so accurate sizing helps keep the center upright; use the ring size and fit guide. Clean beneath each stone with warm water, mild soap and a soft brush.

FAQ

Can I choose another center diamond size?
Yes. The round center is available from 1 to 4.5 ct, and the basket and metal weight scale to the selected carat. The photographed configuration uses an approx. 3.50 ct center measuring 10.00 mm.

How many side diamonds are included?
Four side diamonds are included: two marquise diamonds and two round diamonds. Together they total approximately 0.370 ct in the photographed configuration.

How are the marquise side stones positioned?
The marquise diamonds sit lengthwise beside the center, with their pointed ends following the line of the band. A smaller round diamond sits beyond each marquise to complete the graduation.

How is the center diamond held?
The round center is held in a four-prong basket. The prongs secure the diamond at four points while leaving most of its circular edge visible.

Will a wedding band sit beside this ring?
A straight wedding band sits close beneath the raised center basket. The side-stone settings can leave a small gap near the head, while a gently contoured band follows the ring most closely.

What is the difference between marquise side stones and round side stones?
Marquise side stones create longer flashes and extend the line of the ring across the finger. Round side stones produce tighter points of light and make the transition into the plain band more gradual.

How do lab grown diamonds compare with mined diamonds?
Lab grown diamonds match mined diamonds in carbon structure, hardness and optical behavior; their origin is different. Signora Jewels supplies this ring only with Lab Grown Diamond stones.

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