Coffin Cut Lab Grown Diamond Cluster Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

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$1,071.00

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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.

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.

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The Signora Promise

Hand-finished in SuratMade to order

Reports where statedExact scope shown

Insured deliverySigned & tracked

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Standard-design returns30-day eligibility

Final inspectionChecked before dispatch

About This Ring

Cut · Cluster

Center

Cut

Carat

1 ct

Customizable

Metal

Customizable

Setting

Cluster

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	Coffin · 10.8 × 6.5 mm · approx. 2.00 ct	1–4.5 ct
Side gemstones	6 round green gemstones · approx. 0.30 ct total	Scales with center
Total diamond weight	approx. 2.00 ct	Varies with selected center
Total stone weight	approx. 2.30 ct · 7 stones	Varies with selected center
Stone type	Lab Grown Diamond center · Green gemstone accents	—
Setting	Six-Prong with Side Stones	Scales with center
Band	Sculptural open leaf-and-vine shoulders	—
Finish · Occasion	High Polish · Engagement, Anniversary, Bridal	—

Diamond details

Shape	Size	Qty	Weight (approx.)
Coffin center diamond	10.8 × 6.5 mm	1	2.00 ct
Round green gemstones	—	6	0.30 ct total
Total stones	—	7	2.30 ct total stone weight

At a glance

A coffin cut lab grown diamond nature-inspired engagement ring from Signora Jewels.

The photographed design centers a 2.00 ct coffin cut measuring approximately 10.8 × 6.5 mm in a six-prong setting, with 6 round green gemstones totaling approximately 0.30 ct. Approx. 2.30 ct combined stone weight.

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

Each metal color is shown in the photos. Choose a 1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct or 4.5 ct center and your preferred metal from the options on this page.

Signora Jewels sets the 10.8 × 6.5 mm coffin cut between branches that curl around the center rather than stopping beneath it. Six prongs hold the photographed 2.00 ct diamond, while six round green gemstones sit between polished vines and individually modeled leaves.

The shoulders spread to approximately 5.20 mm through the botanical sections before narrowing to a 2.30 mm lower shank. Open spaces separate the leaves, colored stones and crossing branches. At the photographed center weight, the setting stands approximately 8.00 mm high.

Design highlights

Coffin cut center options: 1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct or 4.5 ct
2.00 ct reference center measuring approximately 10.8 × 6.5 mm
Six round green gemstones totaling approximately 0.30 ct
Six-prong setting following the angular center outline
Sculptural leaves and crossing vines worked into the open shoulders
Approx. 5.20 mm shoulders tapering to a 2.30 mm lower shank

The green stones are worked into the vine rather than arranged as a conventional straight side-stone row. Three rounds sit on either side of the center among raised leaves and curling branches, putting small points of color against the angular white center. Explore more engagement rings, compare unusual cuts in the diamond stone guide, or review the available choices in the metal guide.

Diamond & Ring Details

Specification	Details
Center stone	Coffin Cut Lab Grown Diamond · 10.8 × 6.5 mm · approx. 2.00 ct in the photographed design
Side gemstones	6 round green gemstones · approx. 0.30 ct total
Total diamond weight	approx. 2.00 ct in the photographed design
Total stone weight / count	approx. 2.30 ct · 7 stones
Setting	Six-Prong with Side Stones
Band	Nature-inspired open leaf-and-vine shoulders
Band details	Approx. 2.30 mm lower width · 1.90 mm lower thickness · 5.20 mm shoulder width
Setting height	Approx. 8.00 mm at the 2.00 ct reference weight
Center options	1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct, 4.5 ct
Finish	High Polish

Measurements are approximate. The selected center weight determines the final diamond dimensions and setting proportions.

About Lab Grown Diamonds

The coffin cut reference center measures approximately 10.8 × 6.5 mm at 2.00 ct. Its elongated body, clipped upper corners and tapered lower outline give the six-prong setting distinct contact points while leaving broad sections of the diamond visible between them.

Metal, Care & Fit

The reference construction uses approximately 6.65 g of 18K gold before the stones are set. Yellow and rose gold bring out the modeled leaves and contrast with the green side stones; white gold and platinum put more visual separation between the botanical metalwork and colored accents. Clean beneath the center and between the open branches with warm water, mild soap and a soft brush.

FAQ

What are the six colored stones beside the center?
Six round green gemstones totaling approximately 0.30 ct sit through the leaf-and-vine shoulders. Three are positioned on either side of the photographed coffin cut center.

How is the coffin cut center secured?
Six prongs hold the photographed 10.8 × 6.5 mm center around its angular outline. The spaces between the prongs leave much of the 2.00 ct reference diamond exposed to view.

How wide are the botanical shoulders?
The shoulders reach approximately 5.20 mm through the leaf-and-vine sections before tapering to a 2.30 mm lower shank. Open spaces between the branches break up that width.

How high does the 2 ct reference center sit?
The photographed setting is approximately 8.00 mm high. The center setting scales with the selected diamond weight while retaining the surrounding botanical shoulder design.

How should I clean around the green side stones?
Use warm water, mild soap and a soft brush around the six round gemstones and from beneath the open vine shoulders. The spaces between the leaves and branches give direct access to areas where lotion can collect.

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.

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