Cushion Lab Grown Diamond Solitaire Engagement Ring (3.00 ct)

IGI Report IncludedMade to OrderInsured Delivery

Cushion Old Mine Cut Lab Grown Diamond solitaire engagement ring in white gold with double-claw prongs and a cathedral basket.

1 of 9

$732.00

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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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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

Cushion Cut · Solitaire

Center

Cushion Cut

Carat

1 ct

Customizable

Metal

Customizable

Setting

Solitaire

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	Cushion Old Mine Cut · 9.35 × 7.80 mm · approx. 3.00 ct	1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct, 4.5 ct
Accent diamonds	None	—
Total diamond weight	Approx. 3.00 ct	Varies with center size
Stone type	Lab Grown Diamond	—
Setting	Four Double-Claw Prong Cathedral Open Basket Solitaire	—
Finish · Occasion	High Polish · Engagement, Anniversary, Bridal	—

At a glance

A cushion Old Mine cut lab grown diamond solitaire engagement ring from Signora Jewels.

An approximately 3.00 ct cushion Old Mine cut diamond measuring 9.35 × 7.80 mm is secured in a four double-claw cathedral basket with an open gallery.

Made to order in 11 metals: Silver, 10K/14K/18K Gold (Yellow, White and Rose) and Platinum.

Each metal color is shown in the photos. Choose your preferred center diamond weight and metal from the options on this page.

The broad facets of the Old Mine cushion create bold flashes of light while the softly rounded outline gives the stone its distinctive antique-inspired character. At Signora Jewels, four double-claw prongs secure each corner without overwhelming the center, while the cathedral basket lifts the diamond above the shank so light can enter freely through the open gallery.

The approximately 2.10 mm comfort-fit shank provides balanced support beneath the larger center stone without distracting from its proportions. With an approximate setting height of 8.00 mm, the elevated basket creates an elegant side profile while keeping the solitaire refined and comfortable for everyday wear.

Browse our engagement rings, compare diamond shapes in the diamond stone guide, or explore precious metal options in our metal guide.

Design highlights

Cushion Old Mine cut center shown at approximately 3.00 ct
Customizable center diamond from 1 ct to 4.5 ct
Four double-claw cathedral basket
Open gallery beneath the center stone
Comfort-fit shank approximately 2.10 mm wide
Made to order in 11 precious metal options

The double-claw prongs emphasize the softly squared outline of the Old Mine cushion while keeping the corners protected. The open cathedral basket creates an airy profile that complements the larger center stone without adding unnecessary visual weight.

Diamond & Ring Details

Specification	Details
Center stone	Cushion Old Mine Cut · 9.35 × 7.80 mm · approx. 3.00 ct (shown)
Accent stones	None
Total weight / count	Approx. 3.00 ct · 1 Diamond
Setting	Four Double-Claw Prong Cathedral Open Basket Solitaire
Center options	1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct and 4.5 ct
Finish	High Polish

Measurements are approximate. Your selected center diamond weight determines the final proportions of the finished ring.

About Lab Grown Diamonds

The Old Mine cushion is admired for its broad antique-style facets and soft pillow-shaped outline that produce larger flashes of light than modern brilliant cuts. Every center diamond is F color, VS1 clarity and , selected to complement the proportions of this cathedral solitaire.

Metal, Care & Fit

Available in Silver, 10K, 14K and 18K Yellow, White and Rose Gold, plus Platinum. Clean beneath the open cathedral basket using warm water, mild soap and a soft brush to remove everyday buildup and maintain the brilliance of the center diamond.

FAQ

Why does this ring use double-claw prongs?
Each corner is secured by two fine claw tips instead of one, providing additional protection while preserving the elegant outline of the Old Mine cushion.

What is the benefit of the cathedral basket?
The cathedral shoulders support the basket from below while raising the center diamond into stronger light. The open gallery also makes routine cleaning easier.

Can this ring be paired with a wedding band?
Yes. The cathedral basket allows many straight wedding bands to sit close, while contoured bands can follow the raised profile more precisely.

Which metal color best suits an Old Mine cushion?
Yellow and rose gold highlight the antique-inspired character of the cushion, while white gold and platinum emphasize the crisp outline of the double-claw cathedral setting.

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