Marquise Cut Lab Grown Diamond Engagement Ring
Marquise lab-grown diamond engagement rings in 18K solid gold, every centre stone GIA-certified. A marquise diamond is a long, pointed oval.
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A marquise engagement ring is the right choice when anyone who wants maximum visual size for a given budget and a striking, unconventional silhouette. The shape sets the entire visual character of the ring, and the marquise is one of the most distinctive choices you can make.
A marquise diamond is a long, pointed oval. It has the largest surface area of any diamond shape per carat. A 1 ct marquise looks substantially larger than a 1 ct round. Both points elongate the finger dramatically. Anyone who wants maximum visual size for a given budget and a striking, unconventional silhouette.
Best settings for a marquise centre stone
V-prongs at both points are non-negotiable to protect the diamond from chipping. A solitaire lets the marquise do everything; a halo adds a frame of smaller diamonds and makes the centre look 25–30% larger; a three stone setting flanks the centre with two accent diamonds.
What to expect on the finger
A 1 ct marquise is about 10 × 5mm. Most Riyanika customers choose between 1 ct and 2 ct for a marquise centre. Lab-grown diamonds give you the same brilliance as a mined diamond at roughly 40–60% of the price, which means you can comfortably size up the centre stone.
Lab-Grown Diamond centre stones
Every centre stone above 0.30 ct is GIA-certified and laser-inscribed with its grading report number. Every ring is built in 18K solid gold (yellow, white or rose), hand-finished and hallmarked in our workshop. For the full lab-grown diamond engagement ring range across all shapes, see our main lab-grown diamond engagement ring collection.
What comes with the ring
The original GIA grading report, a formal appraisal for insurance, one free resize within 60 days, and lifetime cleaning and prong checks. Every ring ships in a signature Riyanika box.
Bespoke
Not seeing the exact combination you want? Every Riyanika engagement ring can be made bespoke at no extra cost. Start your design here and we will send a CAD render for your approval before any gold is cut.
Frequently Asked Questions
How big does a 1 ct marquise diamond look?
A 1 ct marquise is about 10 × 5mm. On an average size 6 finger this reads as a confident, well-proportioned centre stone.
Is a marquise diamond more expensive than a round?
Round brilliants typically cost 15–25% more than fancy shapes (oval, emerald, pear, cushion, etc.) at the same carat weight and grade. The premium reflects how much rough diamond is wasted to cut a round vs a fancy shape.
What setting works best with a marquise cut?
V-prongs at both points are non-negotiable to protect the diamond from chipping. A solitaire is the most popular for letting the shape speak for itself; a halo is the most popular for making the centre look larger.
Are lab-grown diamond marquise diamonds GIA-certified?
Every centre stone above 0.30 ct is GIA-certified and laser-inscribed with its grading report number.
Can I customise this ring?
Yes. Every Riyanika engagement ring can be made bespoke at no extra cost on most designs. We will send a CAD render before any gold is cut.
How do I care for a marquise engagement ring?
Clean at home once a month with warm water, mild washing-up liquid, and a soft toothbrush. Bring the ring in once a year for a professional clean and prong check (free for life at Riyanika). Take the ring off for the gym, swimming, and gardening.