Jewelry Rings Vintage & Antique Engagement Rings

4.37ct Antique Old Mine Cut Diamond solitaire ring in 18kt yellow gold and platinum, GIA M SI1.

Transitional-era Old Mine Cut diamond with chunky facets and elongated shape on model.

Antique two-tone diamond ring featuring Old Mine Cut diamond and detailed gallery.

GIA certified M SI1 Old Mine Cut diamond ring, vintage yellow gold and platinum setting.

Antique-style solitaire ring featuring a 4.37‑carat old mine‑cut diamond set in a yellow‑gold band. The diamond displays a softly squared cushion shape with gently rounded corners and chunky, hand‑cut facets that catch the light with a warm glow. The setting includes a delicate scalloped or bezel-like gallery that frames the diamond close to the finger. The gold band is slim and smooth, with subtle engraving or detailing on the shoulders, lending a romantic, vintage aesthetic.

Side view of collector’s antique diamond solitaire with transitional cut and intricate details.

Video of 4.37ct Old Mine Cut diamond with Old European style faceting in antique setting.

4.37ct Antique Old Mine Cut Diamond Ring | GIA M SI1 | 18kt Yellow Gold & Platinum

Regular price: $48,900.00 USD
Sale price: $48,900.00 USD
Regular price

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The 4ct club is growing here at JbyG HQ, and this one has us particularly excited — for many reasons!

This 4.37ct Antique Old Mine Cut Diamond, GIA certified M SI1, is pure magic. She’s got chunky facets reminiscent of an Old European Cut, hinting that she was likely cut during the transitional period between the two styles. Her soft, slightly elongated shape and 57% depth mean she faces up beautifully — closer to a 5ct diamond visually.

Despite her grading, she’s bright, incredibly lively, and 100% eye clean — we’d never guess her specs based on appearance! We set her in a two-tone antique setting of 18kt yellow gold and platinum, one we’d been saving for a diamond this special — and wow, do they sing together. The gallery details are intricate and romantic, with vintage charm coming from every angle.

A true transitional-era treasure that blends the best of Old Mine and Old European cuts — she’s bold, rare, and downright beautiful.

18kt Yellow Gold & Platinum
Size 6.75 & resizable
GIA M SI1
GIA Report Number: 2235528723
Diamond measures 10.37 - 10.92 x 6.11 mm

Learn More About Old Mine Cuts

An Old Mine Cut takes us back to the early days of diamond cutting, long before laser precision ruled the scene. Think chunky, soulful facets, a higher crown, intimate glow under candlelight — every facet tells of hand-craftsmanship and rustic charm.