Cushion Lab Grown Diamond Vintage Engagement Ring

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

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.