Page
Lab-Grown Round Cut Diamonds: The Complete Guide
A round cut lab-grown diamond is the circular, brilliant-cut shape engineered for maximum light return, giving it more brilliance and fire than any other standard cut. With an ideal length-to-width ratio of 1.00 and no sharp corners to chip, it suits anyone wanting a timeless, versatile, setting-friendly stone. At CRTD, round cuts start from $990 AUD (1ct VS1).
Overview
The Round diamond is the benchmark of brilliance, celebrated for its near-perfect symmetry and timeless appeal. It is engineered with 57 or 58 facets, all meticulously arranged to optimise light reflection and dispersion. This classic shape has long been the standard for diamond cutting, offering a radiant display of fire and scintillation. Its universal appeal makes it ideal for every style and occasion, reflecting the epitome of elegance in both modern and traditional jewellery settings.
Origin and development
The round brilliant cut was refined in the early 20th century by master diamond cutters, such as Marcel Tolkowsky, whose pioneering work established the modern standards we recognise today. Its development was driven by a desire to create maximum sparkle and fire, qualities that have since become synonymous with luxury diamonds. With its roots in both tradition and innovation, the round diamond continues to be the most popular shape in the industry, symbolising both timeless beauty and advanced cutting craftsmanship.
How the round cut is shaped
The round cut is defined by its perfectly circular shape and meticulously arranged facets that create a harmonious balance of light and symmetry. Every facet is strategically placed to maximise brilliance, ensuring that light enters and exits the stone optimally. The shape’s curvature and consistent geometry not only provide visual appeal but also offer a classic aesthetic that transcends trends. Its form is both modern and timeless, making it a versatile option that adapts to a wide range of design styles and jewellery settings.
Why choose a round cut
Round diamonds deliver unmatched brilliance and sparkle due to their precise faceting. The arrangement of facets is designed to capture and reflect light from every angle, producing an intense, continuous display of fire. This shape’s ability to mask minor imperfections while enhancing overall visual performance has made it a favourite among both designers and buyers. Additionally, its versatility means it fits seamlessly into various jewellery settings, from solitaire rings to elaborate multi-stone designs, making it the go-to choice for those seeking maximum impact.
What to look for when buying
Prioritise cut quality first: it drives the light return that makes the stone come alive. We screen proportions, polish and symmetry before a stone is ever shortlisted. Every CRTD stone is independently certified by IGI or GIA at a VS1 minimum clarity.
Price
Lab-grown round cut diamonds at CRTD start at $990 AUD for a one carat stone, with AU-inclusive pricing, the number you see is the number you pay. Larger carats and higher clarity grades are priced transparently across the range.
Choosing well
With the round cut, the cut grade matters more than any other factor, because its precise faceting is what produces that signature light return; a poorly cut round looks flat no matter how high the clarity. Prioritise the cut grade first, then aim for a length-to-width ratio close to 1.00 so the outline reads as a true circle rather than a slightly oval shape.
Sourced to your brief
We do not hold a wall of inventory. Tell us your brief and our atelier shortlists certified round cut stones to match, each with full IGI or GIA paperwork. See how we source.
Common questions
What is the ideal length-to-width ratio for a round cut diamond?
The ideal length-to-width ratio for a round cut is 1.00, which gives a true circular outline. Because the round is symmetrical by design, staying close to 1.00 keeps the shape balanced and even. Any noticeable deviation makes the stone read as slightly oval rather than evenly round, so it is worth checking on the certificate.
Is a round cut lab-grown diamond durable enough for everyday wear?
Yes. The round cut has no sharp points or corners, so there are no vulnerable areas prone to chipping, making it one of the most setting-friendly and hard-wearing shapes. This suits it well to engagement rings and pieces worn daily. Every CRTD stone is independently certified by IGI or GIA at a VS1 minimum clarity.
How much does a round cut lab-grown diamond cost?
At CRTD, round cut lab-grown diamonds start from $990 AUD for a 1ct VS1 stone, with pricing inclusive. Cost rises with carat weight and higher clarity grades. Every stone is sourced to order and independently certified by IGI or GIA, so you can compare specifications with confidence before you commit.