Marquise Natural Diamond1.80mm Tube Shank, Cathedral, Reverse Halo

Design Intent

Designed around clean proportions and elevated structure, this engagement ring pairs Diamondboi's signature 1.80mm tube shank with graceful cathedral shoulders that rise naturally toward the centre diamond.

The refined profile keeps the band delicate while giving the centre stone a strong, balanced foundation. A reverse halo introduces an unexpected layer of brilliance, allowing light and sparkle to carry through the setting from every angle.

Minimal from a distance. Detailed up close. Unmistakably Diamondboi.

Signature Details

• All side diamonds are natural, matched to the centre for colour and clarity
• 1.80mm tube shank for a refined, delicate profile
• Cathedral setting designed to elevate and frame the centre diamond
• Reverse halo for brilliance from every angle
• Clean, balanced proportions designed for everyday wear
• Hand-finished and custom made for each centre stone

Centre Diamond

• Natural diamond
• Available from .80ct – 2.00ct+
• E–F colour, VS2+ clarity, GIA certified
• Selected for exceptional cut, proportions and brilliance

This setting can be created for multiple diamond shapes. Select your preferred shape and carat size from the available options — each ring is individually proportioned so the centre stone, cathedral and shank work together seamlessly.

Craft & Customization

• Handcrafted to order in 18KT White, Yellow, or Rose Gold
• 18KT Two-Tone available
• Platinum available upon request
• Ring sizes available in ¼ and ½ increments
• In-between carat sizes and larger centre diamonds available upon request

Production Time

Each engagement ring is custom made to order in our Toronto studio. Please allow 4–6 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.