Blue Marquise Lab Grown Diamond Three Stone Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

1 of 8

$800.00

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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Forever, A & J

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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 · 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	In the photos	Customizable
Center diamond	Marquise Cut · blue appearance · approx. 12.49 × 5.82 × 3.54 mm · approx. 1.50 ct reference center	Choose from 1–4.5 ct
Side diamonds	2 pear-cut diamonds · approx. 0.63 ct combined	Same two-pear arrangement
Side diamond reference quality	E–F color · VS clarity	Reference specifications for the pear pair
Total diamond weight	Approx. 2.13 ct · 3 diamonds	Varies with the selected center
Stone type	Lab Grown Diamond	Lab Grown Diamond across all options
Setting	Three-Stone with two V-shaped center end guards, four side claws and individually prong-set pears	Same Three-Stone design; dimensions vary with center
Side-stone orientation	Pear tips point outward toward the shoulders	Same outward-facing arrangement
Band	Plain polished shank without pavé or a halo	Same plain-band design
Finish · Occasion	High Polish · Engagement, Anniversary	All metal and center options

Diamond details

Shape	Size	Qty	Weight (approx.)
Blue marquise center	12.49 × 5.82 × 3.54 mm	1	1.50 ct
Pear side diamond 1	5.60 × 3.88 × 2.45 mm	1	Included in the 0.63 ct pear-pair total
Pear side diamond 2	5.49 × 3.91 × 2.26 mm	1	Included in the 0.63 ct pear-pair total
Total		3	2.13 ct

The pear pair totals approximately 0.63 ct. Individual carat weights are not specified; the two sets of measurements describe separate stones.

At a glance

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

The approx. 1.50 ct reference marquise measures 12.49 × 5.82 × 3.54 mm, with two V-shaped end guards, four side claws and two pear accents totaling 0.63 ct.

Made to order in 11 metals: silver, 9K/14K/18K gold (yellow, white, rose) and platinum.

Made to order in your chosen metal with a blue marquise center from 1 to 4.5 ct.

Signora Jewels sets the blue marquise upright between two outward-pointing pears in this three-stone engagement ring. Two V-shaped guards cover the center’s points; four rounded side claws hold its curved edges.

The approximately 1.50 ct reference center measures 12.49 × 5.82 × 3.54 mm. The shank stays plain.

Design highlights

Blue marquise reference center, approximately 1.50 ct and 12.49 × 5.82 × 3.54 mm
Selectable center weights from 1 to 4.5 ct
Two V-shaped center end guards plus four rounded side claws
Two individually measured pear side diamonds totaling approximately 0.63 ct
Outward-facing pear tips leading into plain polished shoulders
Approximately 2.13 ct reference total across three diamonds, without a halo or pavé

The pears broaden the design at the marquise’s waist, then taper toward the shoulders. Their combined reference weight is approximately 0.63 ct.

Diamond & Ring Details

Specification	Details
Reference center	Marquise Cut · blue appearance · approx. 12.49 × 5.82 × 3.54 mm · approx. 1.50 ct
Center options	1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct, 4.5 ct
Pear side diamond 1	5.60 × 3.88 × 2.45 mm
Pear side diamond 2	5.49 × 3.91 × 2.26 mm
Side diamond weight	Approx. 0.63 ct combined for both pears
Reference total weight / count	Approx. 2.13 ct · 3 diamonds
Setting	Three-Stone with two V-shaped center end guards, four side claws and separate pear settings
Band width at base	Estimated 2.00 mm for the reference design
Band thickness at base	Estimated 1.70 mm for the reference design
Shoulder width	Estimated 3.5–4.0 mm through the pear side-stone section
Setting height	Estimated 6.5–7.0 mm for the reference design
Finish	High Polish

Measurements and total weight describe the 1.50 ct reference design; final dimensions and total weight vary with the selected center.

About Lab Grown Diamonds

The blue marquise lab grown diamond contrasts with the white pear sides. There is no halo or pavé along the band.

Metal, Care & Fit

Brush gently around both V-shaped guards and the outward-pointing pears using the care guidance. Check companion-band clearance beside the pear settings.

FAQ

What covers the blue marquise’s two pointed ends?
Two V-shaped metal guards cover the marquise’s points, while four rounded claws hold its sides. The faceted top and sections of the curved edges remain exposed. Remove the ring for lifting or activities that risk hard knocks to the center.

Are the two pear side diamonds exactly the same dimensions?
The reference pears measure 5.60 × 3.88 × 2.45 mm and 5.49 × 3.91 × 2.26 mm, so their dimensions are similar but not identical. Their combined weight is 0.63 ct; separate carat weights are not specified.

Does every blue marquise option measure 12.49 mm long?
The 12.49 × 5.82 × 3.54 mm measurements describe the approximately 1.50 ct reference center only. Other center weights retain the marquise shape and Three-Stone arrangement, but the diamond dimensions and setting proportions differ.

Where should I clean around the outward-pointing pear settings?
Each pear has its own prong setting, with its pointed end facing the shoulder rather than the blue center. Use warm water, mild soap and a soft brush around the pear tips, their inner prongs and both center guards, then rinse and pat dry without drawing cloth beneath the prongs.

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