Phantom Coffin Lab Grown Diamond Split Shank Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

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$971.00

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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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Center Diamond:

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Forever, A & J

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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

Cut · Pavé

Center

Cut

Carat

1 ct

Customizable

Metal

Customizable

Setting

Pavé

An independent IGI grading report is included when the selected individual lab-grown center or primary diamond is 0.50 ct or larger.

Detail	Reference Design	Customizable
Center Diamond	Coffin Cut Lab Grown Diamond · 11.00 × 6.80 mm · Approx. 2.00 ct (Reference)	1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct, 4.5 ct
Accent Diamonds	40 Round Brilliant Lab Grown Diamonds · Approx. 0.23 ct Total	Scaled proportionally with the selected center diamond
Total Diamond Weight	Approx. 2.23 ct (Reference)	Varies with the selected center diamond
Stone Type	Lab Grown Diamond	—
Setting	Four-Prong Cathedral Basket with Double Row Split Shank Pavé	—
Finish	High Polish	—
Occasion	Engagement · Anniversary · Statement	—

At a glance

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

The reference design features an approximately 2.00 ct coffin cut lab grown diamond surrounded by forty round brilliant lab grown accent diamonds totaling approximately 0.23 ct. The reference total diamond weight is approximately 2.23 ct.

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

Select your preferred center diamond size and precious metal using the options on this page.

The elongated coffin cut center diamond is elevated in a four-prong cathedral basket that allows generous light through the open gallery while emphasizing the dramatic geometry of the stone. The distinctive silhouette creates a bold focal point with striking finger coverage.

Double rows of pavé-set lab grown diamonds sweep along the split shank before meeting beneath the center, adding continuous brilliance from every angle. Pavé accents beneath the gallery complete the design with additional sparkle while maintaining a clean architectural profile. Every ring is handcrafted to order by Signora Jewels.

Design Highlights

Customizable coffin cut lab grown diamond from 1 ct to 4.5 ct
Double row pavé split shank
Forty round brilliant accent diamonds
Four-prong cathedral basket
Hidden gallery pavé accents
High polish finish

Browse our Engagement Rings, explore the Engagement Ring Guide, or compare precious metals in our Metal Guide.

Diamond Details

Specification	Details
Reference Center Diamond	Coffin Cut Lab Grown Diamond · 11.00 × 6.80 mm · Approx. 2.00 ct
Split Shank Pavé Diamonds	32 Round Brilliant · Approx. 0.19 ct Total
Gallery Accent Diamonds	8 Round Brilliant · Approx. 0.04 ct Total
Total Stones	41
Reference Total Diamond Weight	Approx. 2.23 ct
Available Center Sizes	1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct and 4.5 ct

The measurements shown represent the photographed reference model. Final proportions vary according to the selected center diamond.

About Lab Grown Diamonds

The coffin cut offers bold geometric lines with contemporary character, while the double pavé split shank amplifies brilliance without competing with the center stone. Together they create a striking engagement ring with modern architectural styling.

Metal, Care & Fit

Available in Silver, 9K, 14K and 18K Yellow, White and Rose Gold, plus Platinum. Clean beneath the cathedral basket and between the split shank using warm water, mild soap and a soft brush to maintain the brilliance of every lab grown diamond.

FAQ

Why does this ring use a split shank?
The split shank visually balances the elongated coffin cut center while adding additional surface for pavé-set diamonds.

Can I customize the center diamond?
Yes. This design is available with center diamond sizes from 1 ct through 4.5 ct.

What do the gallery diamonds add?
The hidden gallery diamonds introduce subtle sparkle beneath the center stone that becomes visible from side angles.

Is this design comfortable for daily wear?
Yes. The cathedral basket and balanced split shank are designed to provide secure support and comfortable everyday wear.

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