Elongated Old Mine RingMarquise Illusion Setting with Diamond Prongs

Design Intent

This design was created to bring together vintage character and modern precision.

At the center sits an elongated old mine cut — a stone known for its depth, movement, and unique facet pattern. Surrounding it, four marquise diamonds are set in a custom illusion layout, creating a wider visual spread while maintaining a clean, balanced silhouette.

Finished with diamond-encrusted prongs, every angle of this ring was designed to catch light — not just from the top, but from every direction.

Signature Details

• All side diamonds are natural, matched to the centre for colour and clarity
• Elongated old mine cut centre stone
• Diamond-encrusted prongs for added brilliance and detail
• 4 marquise diamonds (5.00 x 2.50mm each)
• Custom illusion setting to enhance finger coverage and visual size
• Balanced multi-stone composition with a clean top profile
• Crafted in solid 18KT gold
• Designed for maximum light performance from all angles

Centre Diamond

Every centre stone is selected to meet our standard:

• E-F colour | VS2+/VS1 clarity
• Available in natural (GIA certified)
• Old mine cut offers a distinct, vintage-inspired facet pattern
• Elongated proportions enhance presence and finger coverage (1.50-1.60% Ratio)

Craft & Customization

Every Diamondboi piece is made from scratch — never mass produced.

This design can be customized:

• Centre stone size and proportions
• Marquise sizing and layout adjustments
• Metal options (white, yellow, rose gold, platinum)

Built specifically for you — based on your vision and your budget.

Diamondboi Standard

This is where craftsmanship shows.

From the precision of the illusion setting to the detailing in the prongs, every element is intentional — designed to elevate the stone and maximize brilliance without compromising balance.

Production Time

Each engagement ring is custom made to order in our Toronto studio. Please allow 5–6 weeks for production prior to shipping.

Explore more natural diamond engagement rings, or complete the set with a women's natural diamond wedding band.

For over 20 years, Diamondboi has designed and handcrafted fine jewellery for clients who value quality, integrity, and timeless design.

Every piece is created with intention — balanced proportions, secure settings, and craftsmanship meant to last a lifetime.

A natural diamond formed in the earth over millions of years, and that origin is where its rarity premium comes from. Every diamondboi natural centre diamond is GIA-certified, E–F colour and VS2 clarity or better, and chosen for cut performance first, because cut is what makes a diamond come alive. The side diamonds on a natural ring are natural too, matched to the centre for colour and clarity.

Natural and lab-grown diamonds share the same optical, chemical and physical properties; the difference is origin. Nobody can tell them apart by eye. The only visible differences are the laser inscription on the girdle and the number on the grading report.

Choose natural if the story of origin matters to you. If you would rather put the budget toward a larger or higher-grade stone, the same design is available with a lab-grown centre in our lab-grown collection. Either way, the ring is made the same way, in the same studio, with the same lifetime guarantee. Read the full guide →

1. Order confirmation and review
2. Design and sizing confirmation (if needed)
3. Crafting begins
4. Final inspection
5. Secure, fully insured delivery

All orders ship via trackable courier with signature required.
For high-value orders, our team may reach out to confirm details — this ensures everything is perfect and secure.