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Round Cut Moissanite Engagement Rings

Crafted by our jewelers with care and precision.

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Round Cut Engagement Rings — Timeless, Forever.

Timeless, brilliant and universally adored — a round cut engagement ring is a style icon perfect for those who treasure elegant, enduring beauty. With its 58 symmetrical facets, the round cut’s sparkle is unmatched, making it one of the most versatile shapes for a wide range of settings. Suitable for solitaires, halos, vintage and modern designs alike, a round cut engagement ring is a classic choice that will never go out of style. 

At Cullen, every round cut ring is handcrafted using premium materials and lab grown gemstones. Explore the collection online or begin your journey in one of our showrooms in the US with a design consultation — whatever the process, we're here to help you cherish your forever love with the ring of your dreams.

Find Your Perfect Round Cut Engagement Ring with Cullen

Cullen specializes in custom-made round cut engagement rings, handcrafted to mark one of life’s most meaningful moments in a style unique to your love.

Widely admired for their enduring beauty and timeless, brilliant sparkle, round cut rings are an exquisite option for those who value elegance, sophistication, and iconic design.

Whether you’re seeking a sparkling solitaire or a vintage-inspired halo of diamonds, our experienced jewelers and knowledgeable client advisors will guide you through every step of the journey — from concept to completion. 

Each ring is handcrafted using conflict-free and carbon-neutral lab grown diamonds,  moissanite and sapphires, so you can feel confident that your ring is as responsible as it is exquisite to look at.

Need a little guidance? Don’t hesitate to contact us or book an in-person appointment with one of our friendly engagement ring specialists to begin designing your dream piece.

Why Cullen

Worldwide Express Shipping No matter where you are in the world, your dream ring will go the distance. We proudly ship our round cut engagement rings across the US and internationally, ensuring your custom piece arrives safely and swiftly.

Free Resizing We offer free resizing on all engagement rings to ensure the perfect fit, whether you've chosen one of our ready-to-ship round cut diamond engagement rings or something uniquely your own.

Lifetime Warranty Our beautiful engagement rings in round cut are built to last a lifetime. Each piece is backed by our lifetime manufacturing warranty, giving you complete peace of mind.

Tailored Ring Customization From custom round engagement rings to personalized band details, we offer an extensive customization service so you can craft a ring that’s truly one of a kind.

Thoughtfully Designed in Melbourne, Australia Every ring —  including our round cut engagement rings, is crafted by our expert jewellers with exceptional attention to detail.

Conflict-Free, Consciously Crafted We offer a variety of unique options, from round cut engagement rings with moissanite to colored sapphire engagement rings, all thoughtfully curated for your forever ring.

Carbon Neutral Gemstones & Trees For The Future We offset the carbon footprint of all of our gemstones and plant a tree for each ring sold, supporting global reforestation.

Custom Design Specialists Whether you're dreaming of minimalist round cut solitaire engagement rings or elaborate round cut halo engagement rings, our team specializes in creating jewelry that reflects your personal style.

 

Looking for a specific style? Choose from our collections below:

A round cut diamond is a circular-shaped stone featuring 58 facets, cut with precision that allows each angle to reflect the maximum amount of light. This design creates a dazzling display of brilliance and is widely recognized as the shape that delivers the most sparkle. 

Round cut diamond engagement rings are universally admired for their timeless elegance and versatility. Their iconic round shape and dazzling sparkle appeal to those who appreciate classic, beautiful design. The circular shape flatters any finger and suits a variety of settings, from classic solitaires to intricate halo designs.​ Engagement rings with round cut center stones are ideal for someone seeking a design that will never go out of style.

Absolutely. Cullen specializes in custom-designed engagement and wedding rings. Choose from a range of center stones, side stones, and precious metals, as well as various settings, from solitaire to three-stone and more. Whether you are interested in rose gold round cut engagement rings or matching diamond bands, our experienced design specialists will guide you through the custom design process to create the perfect ring that reflects your unique style.​

We offer a selection of consciously curated gemstones in round cut, including:​

Each gemstone is chosen for its quality and sustainability, ensuring your ring is both beautiful and responsibly made.​ Explore our wide range of round brilliant cut engagement rings in one of our showrooms or online using our custom ring builder.

To maintain the brilliance of your sparkling round cut engagement ring:

  • Clean it regularly with mild soapy water and a soft brush.
  • Avoid exposing it to harsh chemicals or abrasive materials.
  • Store it separately to prevent scratches.
  • Schedule periodic professional cleanings and inspections.​

Proper care will keep your ring looking its best for years to come.​ For more information, check out our ring care and ring cleaning guides.

Generally, round cut diamonds can be more expensive per carat as the most diamond rough is lost during the cutting process. Virtually indistinguishable from mined diamonds, a round cut lab diamond can be an excellent choice for engagement rings and other jewellery while often being more affordable.

The price of rings with round cut center stones at Cullen varies based on factors such as the chosen gemstone, carat weight, and setting design. We offer a range of designs to suit different budgets, and our team can help you find or create a ring that meets your preferences and price point.​

Yes, we offer free resizing for all our engagement and wedding rings. If your ring doesn't fit perfectly, simply contact us, and we'll adjust it to ensure a comfortable fit.​

All gold and platinum jewellery from Cullen comes with a lifetime manufacturing warranty. This warranty covers any defects in materials or workmanship, giving you peace of mind that your ring is crafted to the highest standards.​ Explore our collection of silver, platinum and gold round cut engagement rings and find the piece of your dreams today.