Eternity rings UK (2026): what they mean, full vs half, and the best at every budget

The best eternity ring for most people is a half eternity ring of natural diamonds in the same metal as her engagement ring. Our pick is Goldsmiths' 18ct yellow gold 0.75ct claw-set ring, in G colour and SI clarity; under £1,000, the 9ct 0.50ct claw-set ring gives half a carat. For diamonds all the way round, the platinum 0.50ct full eternity ring is the one.

Every ring here is sold new by Goldsmiths, a UK authorised retailer, at Goldsmiths' own price on the date shown, and every one comes in at least seven sizes. All diamonds are natural: we don't list lab-grown.

How we chose

Goldsmiths has more than 500 eternity rings. We kept the ones that come in plenty of sizes, then compared the details Goldsmiths gives for each: the metal, the total diamond weight, the colour and clarity grades, and the width. The explanations of the grades come from GIA, which created the scales most jewellers use. We earn a commission if you buy through our links, which never changes the price you pay.

What an eternity ring means

Goldsmiths describes an eternity ring as a sign of commitment, love and adoration: a promise to cherish the relationship. It's worn between the wedding ring and the engagement ring, and traditionally marks the birth of a child or a significant anniversary, according to Goldsmiths. It doesn't have to: Goldsmiths' own jewellery guide says it makes a stacking ring for any occasion.

Full or half eternity?

• Full eternity: diamonds all the way round the band. The most sparkle, but Goldsmiths says resizing a standard eternity ring is likely to affect the design, so get the size right first.
• Half eternity: diamonds across the front, plain metal at the back. Most of Goldsmiths' eternity rings are half eternity: 326 of the 518 we looked at, against 125 full.

Grades are Goldsmiths' own. On GIA's scale, G is near-colourless, SI means inclusions a skilled grader notices under 10x magnification, and I1 means inclusions that are obvious under 10x and may affect brilliance.

Matching it to her other rings

Goldsmiths' advice on how the wedding and eternity bands sit with the engagement ring:

• Match the width, ideally, so neither ring dominates.
• Match the metal of the engagement ring, as Goldsmiths says most brides do. For wedding bands, Goldsmiths notes platinum with yellow gold is also a popular contrast.

See our guide to 9ct vs 18ct gold, and white gold vs platinum if you're not sure which metal she has.

The best eternity ring overall: 18ct yellow gold, 0.75ct

Three-quarters of a carat of round brilliant-cut diamonds, claw set across the front of an 18ct yellow gold band 3.17mm wide, in G colour and SI clarity, according to Goldsmiths. It comes in 21 sizes, from F to Z.

Best overallGoldsmiths 18ct Yellow Gold 0.75 Carat Round Brilliant Cut Claw Set Half Eternity Ring Rings · Yellow gold · Diamond · 0.75ct total £2,500Price at Goldsmiths, 28 October 2026 Full detailsSee it at Goldsmiths

For white diamonds with a different shape: oval-cut diamonds in 18ct white gold, or emerald-cut ones, both G colour and SI clarity.

The best full eternity ring: platinum, 0.50ct

Half a carat of diamonds channel set all the way round a platinum band 2.65mm wide, in I colour and I1 clarity, according to Goldsmiths, in sizes F to Z.

Best full eternityGoldsmiths Platinum 0.50cttw Brilliant Cut Channel Set Diamond Full Eternity Ring Rings · Platinum · Diamond · 0.5ct total £1,650Price at Goldsmiths, 28 October 2026 Full detailsSee it at Goldsmiths

For higher grades in a full eternity ring, the 18ct yellow gold 0.33ct has H colour and SI1 clarity, in sizes K to O.

The best eternity ring under £1,000

9ct yellow gold, 0.50ct. Half a carat of natural diamonds, claw set in 9ct yellow gold, in I colour and I1 clarity, according to Goldsmiths, in sizes J to P.

Best under £1,000Goldsmiths 9ct Yellow Gold 0.50cttw Diamond Claw Set Eternity Ring Rings · Yellow gold · Diamond · 0.5ct total £850Price at Goldsmiths, 28 October 2026 Full detailsSee it at Goldsmiths

For white gold, the 18ct white gold twist is a crossover design set with diamonds, in H colour and I1 clarity, according to Goldsmiths.

The best 1 carat eternity rings

Platinum seven-stone, 1.00ct. Seven diamonds totalling one carat in platinum, in I colour and I2 clarity, according to Goldsmiths: one of the least expensive ways to a full carat here. Also in 18ct yellow gold.

Best value 1 caratGoldsmiths Platinum 1.00cttw 7 Stone Brilliant Cut Diamond Eternity Ring Rings · Platinum · Diamond · 1ct total £1,500 £2,500Sale price at Goldsmiths, 26 October 2026 Full detailsSee it at Goldsmiths

Platinum full eternity, 1.00ct. A full carat claw set all the way round, in I colour and I1 clarity, in sizes F to Z.

Best 1 carat full eternityGoldsmiths Platinum 1.00cttw Brilliant Cut Claw Set Diamond Full Eternity Ring Rings · Platinum · Diamond · 1ct total £2,500Price at Goldsmiths, 28 October 2026 Full detailsSee it at Goldsmiths

Luxury eternity rings

Goldsmiths Signature five-stone, 1.00ct. Five of Goldsmiths' 77-facet Signature diamonds in 18ct yellow gold, one carat in all, H colour and SI1 clarity. Each stone is GIA certified, and the ring comes with a card giving each diamond's GIA report number, according to Goldsmiths.

The luxury choiceGoldsmiths Exclusive 18ct Yellow Gold 1.00cttw Brilliant Cut 5 Stone Goldsmiths Signature Diamond Eternity Ring Rings · Yellow gold · Diamond · 1ct total £4,750Price at Goldsmiths, 28 October 2026 Full detailsSee it at Goldsmiths

For a wider, bolder band: five rows of pavé-set diamonds in 18ct white gold, 7.4mm wide.

Getting the size right

Ring sizes in the UK are letters. Goldsmiths lists the sizes in stock for every ring, and our pages show them, updated daily. If it's a surprise, borrow a ring she wears on that finger and ask a jeweller to size it. Goldsmiths' extended Christmas returns, which we read in October 2026, cover items bought between 1 October 2026 and 3 January 2027, if unused and in their original packaging, with proof of purchase. Always check Goldsmiths' own page before you order.