Cushion Lab Grown Diamond Vintage Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

Cushion Old Mine Cut Lab Grown Diamond vintage engagement ring in white gold with an eight-prong cathedral basket, engraved split shoulders and milgrain detailing.

1 of 9

$896.00

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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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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

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 · 10.09 × 7.64 × 5.20 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	32 Round Brilliant · approx. 0.19 ct total	Scale with center
Total diamond weight	Approx. 3.19 ct	Varies with center size
Stone type	Lab Grown Diamond	—
Setting	Eight-Prong Cathedral Basket with Hand-Engraved Vintage Split Shoulders and Milgrain Detail	—
Finish · Occasion	High Polish · Engagement, Anniversary, Bridal	—

At a glance

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

An approximately 3.00 ct cushion Old Mine cut diamond measuring 10.09 × 7.64 × 5.20 mm is secured in an eight-prong cathedral basket with 32 round brilliant accent diamonds totaling approximately 0.19 ct.

Made to order in 11 metals: Silver, 9K/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 softly rounded outline of the Old Mine cushion is complemented by hand-engraved split shoulders finished with fine milgrain edges. At Signora Jewels, an eight-prong cathedral basket secures the center stone while keeping its broad antique-style facets fully visible. The engraved shoulders taper naturally toward the basket, allowing the center diamond to remain the dominant feature.

The approximately 2.20 mm comfort-fit shank provides balanced support beneath the larger center stone, while thirty-two round brilliant accent diamonds are integrated into the split shoulders for subtle sparkle. The approximately 8.30 mm setting height creates an elevated profile with an open gallery that allows light beneath the center and simplifies routine cleaning.

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
Eight-prong cathedral basket for enhanced security
32 round brilliant accent diamonds totaling approximately 0.19 ct
Hand-engraved split shoulders with milgrain detailing
Comfort-fit shank approximately 2.20 mm wide

The engraved split shoulders and delicate milgrain details create an heirloom-inspired appearance without surrounding the center stone with a halo. The eight-prong basket highlights the antique proportions of the Old Mine cushion while adding refined visual symmetry from every angle.

Diamond & Ring Details

Specification	Details
Center stone	Cushion Old Mine Cut · 10.09 × 7.64 × 5.20 mm · approx. 3.00 ct (shown)
Accent diamonds	32 Round Brilliant · approx. 0.19 ct total
Total weight / count	Approx. 3.19 ct · 33 Diamonds
Setting	Eight-Prong Cathedral Basket with Hand-Engraved Vintage Split Shoulders and Milgrain Detail
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 cut cushion is known for its broad antique-style facets and softly rounded profile that produce larger flashes of light than modern brilliant cuts. Every center diamond is F color, VS1 clarity and , selected to complement the vintage proportions of this engraved cathedral design.

Metal, Care & Fit

Available in Silver, 9K, 14K and 18K Yellow, White and Rose Gold, plus Platinum. Clean beneath the cathedral basket and along the engraved milgrain shoulders using warm water, mild soap and a soft brush to maintain the brilliance of both the center and accent diamonds.

FAQ

Why does this ring use eight prongs instead of four?
The eight-prong basket provides additional support around the larger Old Mine cushion while preserving its rounded outline. The extra prongs also enhance the vintage appearance of the design.

What does the milgrain detailing add?
Milgrain creates a fine beaded edge along the engraved shoulders that reinforces the Art Deco-inspired styling and adds texture without distracting from the center diamond.

Can this ring be worn with a wedding band?
Yes. The cathedral basket allows many straight wedding bands to sit close, while vintage-style bands complement the engraved split shoulders and milgrain detailing.

Which metal color best suits this vintage design?
Yellow and rose gold enhance the antique-inspired engraving and milgrain finish, while white gold and platinum emphasize the crisp outline of the Old Mine cushion and the eight-prong basket.

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