Round Cut Engagement Rings in Solid 9ct, 14ct & 18ct Gold

Why the Round Brilliant Outperforms Every Other Cut on Light

A round brilliant carries 57 facets — 33 on the crown, 24 on the pavilion — arranged so that light entering the table is reflected internally and sent back out through the top rather than leaking through the base. No other shape returns as much. This is why a round cut looks bright in dim restaurant light where a step cut like emerald can go flat, and why the round brilliant is still the benchmark every other cut is measured against nearly a century after its proportions were finalised.

The trade-off is cost per carat. Cutting a round brilliant from rough discards roughly half the original crystal — more waste than any other common shape — and that loss is priced into the finished stone. A round diamond will almost always cost more per carat than a cushion, emerald or marquise of equal quality.

Round Cut vs Oval, Cushion and Princess

Weight is not size. A 1 carat round brilliant measures about 6.4mm across; a 1 carat oval of the same weight presents a noticeably larger face because its surface is stretched lengthways, and the elongated outline lengthens the finger. If maximum visible size for the budget is the priority, oval or marquise wins. If maximum sparkle is the priority, round wins.

Cushion gives broader, lazier flashes of light rather than the dense scintillation of a round. Princess delivers brilliant-style faceting in a square outline and costs less per carat, but its sharp corners are the most vulnerable point on any diamond and need claws that cover them. Emerald shows clarity openly, so inclusions that would hide inside a round brilliant become visible.

What a Round Cut Engagement Ring Costs

At Qutahia a 1 carat lab grown round brilliant starts from around £1,100 in 9ct gold, £1,360 in 14ct and £1,575 in 18ct. At 1.5 carat the range starts near £1,400, and at 2 carat near £1,790. A mined round brilliant of comparable colour and clarity typically costs three to five times more.

Because round is the most expensive shape per carat, it is also the shape where lab grown diamonds make the largest visible difference — the same budget buys a stone one to two carat grades larger. The honest caveat is resale: lab grown stones hold less second-hand value than mined ones, so if the ring is being bought partly as an asset, natural is the correct choice.

Claw Count and Setting Height

A four claw setting leaves more of the stone visible from above and lets light in from the sides, so the diamond reads slightly larger. A six claw setting — the classic Tiffany-style arrangement — holds the stone more securely and distributes pressure better, which matters on stones above 1 carat. Six claws cover marginally more of the girdle.

Setting height is the decision people regret more often than claw count. A high or cathedral setting lifts the stone clear of the finger and lets light flood in underneath, but it catches on gloves, pockets and hair, and it sits awkwardly against a flat wedding band. A low setting is calmer to live with and sits flush against a band. Neither is better; they suit different hands and different jobs.

Round Cut Diamond Questions, Answered