Blue Marquise Lab Grown Diamond Side Stone Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

1 of 9

$780.00

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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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Complimentary · hand-engraved to order · adds about 3–4 days.

Arrives 7 business days to make, then 5–8 insured & tracked.

30-day returns Courier, insurance & duties covered. No restocking fee.

Duties & taxesPrepaid at checkout. Nothing extra to pay on delivery.

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 ·

Center

Marquise Cut

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
Center diamond	Blue Marquise Cut · 12.41 × 6.15 mm · approx. 1.50 ct	1–4.5 ct
Accent diamonds	16 round diamonds · approx. 0.07 ct total	Scales with center
Hidden accent	1 round blue sapphire · approx. 0.02 ct	Set beneath center
Total diamond weight	approx. 1.57 ct · 17 diamonds	Varies with center size
Stone type	Lab Grown Diamond with hidden blue sapphire accent	—
Setting	Six-Prong with elevated open gallery	—
Finish · Occasion	High Polish · Engagement, Anniversary	—

Diamond details

Shape	Size	Qty	Weight (approx.)
Blue Marquise Cut center	12.41 × 6.15 mm	1	1.50 ct
Round Cut diamonds	Not specified	16	0.07 ct total
Round blue sapphire	Not specified	1	0.02 ct
Total diamond weight	—	17 diamonds	1.57 ct
Total stone weight	—	18 stones	1.59 ct

At a glance

A blue marquise lab grown diamond Six-Prong engagement ring from Signora Jewels.

A 1.50 ct, 12.41 × 6.15 mm blue marquise center is joined by 16 round diamond accents totaling approx. 0.07 ct and one hidden blue sapphire of approx. 0.02 ct.

Made to order in 11 metals: silver, 10K/14K/18K gold (yellow, white, rose) and platinum.

The reference ring carries approx. 1.57 ct total diamond weight, with its sapphire tucked beneath the elevated center setting.

Choose your center weight and metal for this made-to-order ring.

Signora Jewels sets the blue marquise above curling engagement ring shoulders rather than a straight pavé line. Sixteen small round diamonds sit through the leaf-and-vine metalwork, while a single blue sapphire is hidden underneath the center basket.

The 12.41 × 6.15 mm reference center is held by six prongs, including support at both pointed ends. Its gallery rises about 6.5–7.0 mm, leaving the marquise visibly separate from the 4.5–5.5 mm shoulder work.

Design highlights

Blue marquise center · approx. 1.50 ct in the reference design
Center measures approx. 12.41 × 6.15 mm
16 round lab grown diamond accents · approx. 0.07 ct total
1 hidden round blue sapphire · approx. 0.02 ct
Six-Prong setting with elevated open gallery
Sculpted vine-and-leaf shoulders with center options from 1–4.5 ct

The sixteen rounds are spaced through separate curls rather than packed into one continuous row. That leaves polished metal visible between the flashes, while the hidden sapphire adds color underneath instead of competing with the blue marquise from above.

Diamond & Ring Details

Specification	Details
Center stone	Blue Marquise Cut · 12.41 × 6.15 mm · approx. 1.50 ct in the photos
Round accents	16 lab grown diamonds · approx. 0.07 ct total
Hidden accent	1 round blue sapphire · approx. 0.02 ct
Total diamond weight	approx. 1.57 ct in the photographed configuration
Total stone count	18 stones · 17 diamonds + 1 sapphire
Setting	Six-Prong with elevated open gallery and vine shoulders
Center options	1, 1.5, 2, 2.5, 3, 3.5, 4 and 4.5 ct
Finish	High Polish

Measurements are approximate; your selected center weight sets the final diamond dimensions and total weight.

About Lab Grown Diamonds

The reference marquise measures 12.41 mm from tip to tip, giving the blue center a pronounced length across the finger. The sixteen smaller rounds add compact flashes along the shoulders without changing that elongated outline. See the diamond stone guide for more on marquise proportions.

Metal, Care & Fit

White gold and platinum create stronger contrast around the blue center, while yellow and rose gold make the sculpted vine work easier to distinguish. Compare options in the metal guide. Use warm water, mild soap and a soft brush beneath the open gallery and around the recessed round accents.

FAQ

How many round diamonds are set in the shoulders?
The ring has 16 round lab grown diamond accents totaling approximately 0.07 ct. They are distributed through the sculpted vine-and-leaf shoulders rather than forming a straight pavé row.

Where is the blue sapphire?
One round blue sapphire of approximately 0.02 ct sits beneath the center setting. It is a hidden detail rather than a face-up side stone.

How are the pointed ends of the marquise protected?
The center uses a Six-Prong setting with support at both pointed ends. The remaining prongs secure the sides while keeping the 12.41 × 6.15 mm reference outline visible.

How high does the center sit?
The setting rises approximately 6.5–7.0 mm. That leaves an open gallery underneath and separates the marquise from the vine shoulders.

Which metal makes the blue center stand out most clearly?
White gold and platinum create the strongest tonal contrast around the blue marquise. Yellow and rose gold put more emphasis on the sculpted vines and leaf details surrounding it.

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