1 Carat Lab Diamond Ring Price in Australia

A complete 1 carat lab-grown diamond engagement ring costs roughly $2,400 to $4,200 in Australia as of 16 September 2026. The lab-grown specialists we checked that day price complete 1ct rings between $2,611 and $4,170, depending on metal, setting and stone grade. Configuring your own through our builder came to $2,368 in 14k gold with a 1.00ct D colour VS1 round.

Every "from" price you meet online is anchored to a different stone, so split the range into its three parts:

• The loose stone. Every 1 carat lab-grown diamond on our live feed today is D, E or F colour at VS1 clarity or better. Those 530 stones run $1,027 to about $1,600, median $1,271. There is no cheaper tinted tier underneath that range.
• The setting. A made-to-order solid gold or platinum solitaire runs $1,260 to $1,910 at our studio, depending on metal, band width and style.
• The complete ring. Stone plus setting. It is the only number worth comparing between jewellers, and only when the grade and the karat match.

The cheapest ring we can build today, priced from the live feed on 16 September 2026:

• Stone: 1.00ct round lab-grown diamond, D colour, VS1 clarity, excellent cut, IGI certified, 6.43 x 6.47mm, $1,108
• Setting: Hailey 4-claw round solitaire in 14k gold, 1.8mm band, basket, $1,260
• Complete ring: $2,368

Move that same stone into 18k gold and the ring is $2,668. Both include GST. Stones are one-of-one, so this is a dated example rather than a standing quote, and on the same feed another thirty-six round stones sat within $200 of it.

Every price is AUD, includes GST, and was checked on 16 September 2026. None of the rows below were marked as sale prices on the day we checked.

The retailer rows are the cheapest 1 carat configuration each one sells rather than their headline ring, so this is a floor, not a typical basket. Temple & Grace appear twice because their cheapest 1ct price is a 9k band, which is 37.5% gold against 75% in 18k. The two mined rows carry the same carat weight as everything above them, at colours and clarities nobody picks with a lab-grown stone on the tray beside them.

Two of those retailers do not publish a loose 1 carat lab-grown price, which is why the Loose column is empty for them. Temple & Grace do sell loose diamonds, but that range is natural only and starts at $9,435 for a 1.00ct G SI2. Cullen quote a stone as a difference against the ring it sits in, never on its own, so there is no standalone figure to put in the column.

Moi Moi’s $699 is what each of the six 1 carat round lab-grown stones they held in store that day cost. Those stones run 1.00 to 1.07ct, D or E colour, VS1 or VVS2 clarity, ideal cut, IGI certified. It is less than our cheapest round at $1,108, and you should know that before you read the rest of this page. The gap closes once the stone is set, because their cheapest finished 1 carat lab-grown ring is $3,970 and ours is $2,368.

Because "1 carat" fixes only the weight. Four things explain almost every gap:

• Colour and clarity. Moi Moi charge $200 to move from E-F at VS1-VS2 up to D at VVS1-VVS2 on the same setting. That is the grade premium at this weight, and it is small. The real gap is between a named D VS1 stone and an unnamed one, which is what sits behind most "from" prices.
• Metal karat. The same design in 9k, 14k and 18k is three different prices for the same stone. Temple & Grace publish all three and the spread is $750. Any comparison that does not name the karat is noise.
• Overheads. A ring sold through five showrooms carries five showrooms, and that accounts for most of the distance between the top and the bottom of the table above.
• What the price includes. Ask whether the first resize is included, whether the ring ships with the stone's grading report, and whether you get a valuation suitable for insurance. Those extras are worth a few hundred dollars and differ between studios more than the headline prices do.

Yes, by about 20% between the cheapest and the dearest, and not in the direction most people guess. Rounds are not the most expensive shape on our feed today. Cushions are. Below is the cheapest stone in each shape on 16 September 2026, with the complete-ring price in the same 14k gold 1.8mm basket solitaire at $1,260.

Shape pricing moves with what the cutting factories have run recently, so that ordering is a snapshot rather than a rule. The spread holds, though: at 1 carat, changing shape is worth about $200 on the stone, less than moving from 14k to 18k gold. Pick the shape you want and spend the difference on the metal or the cut.

About $1,271 on our feed on 16 September 2026, taking the middle stone rather than the arithmetic mean. The mean is $1,420, and the gap matters: a handful of exceptional stones, one of them $25,073, drag the mean up where the median holds steady. Half the 530 stones sit between $1,187 and $1,463, and nine in ten are under $1,603.

Clarity is what moves the number most at this weight.

Every stone in that set is D, E or F colour, which holds colour roughly steady and lets clarity do the moving. Stepping from VS1 to VVS1 costs about $240 in the middle of the range, and neither grade shows an inclusion without a loupe.

These are one-of-one stones, so the individual diamonds behind those figures will have sold by the time you read this. Take the range rather than any single price. Growers also keep changing what they run, so this is a dated snapshot rather than a standing quote, and we re-check it rather than letting it sit.

The bottom two rows are the comparison most Australians are actually making. Both are a 1 carat round in 14 karat white gold on a claw solitaire. One is a D colour VS1 stone with an IGI report at $2,368. The other is an I+ colour I2 stone at $9,499, and I2 means inclusions visible without a loupe. Four times the price for a stone that grades lower on both scales that matter.

Both stones are crystallised carbon graded on the same scales, and the difference is origin and rarity, which we cover in lab-grown vs natural diamonds. Mined keeps an edge on long-term monetary value. On what actually sits on the hand, the lab-grown stone is whiter, cleaner and a quarter of the money.

Yes, and it looks the same on the hand. Prices step up at the round-number weights because that is what buyers search for, so a 0.90 to 0.99ct stone typically sits below an otherwise identical 1.00ct. A 0.90ct round faces up around 6.2mm against 6.4mm for a 1.00ct, two tenths of a millimetre that nobody will notice. The same logic runs the other way just above the line, which is why a 1.03ct or a 1.07ct stone priced like a 1.00ct is normal rather than a windfall. If a stone just under the magic number appears on the feed with the grade you want, it is usually the best value on the page.

Almost anything. A 1ct centre is roughly 200 milligrams sitting close to the finger, so it does not need the structural overbuild a 3 carat stone does. Our working notes:

• A 1.8mm band is enough in 14k or 18k gold. That is the cheapest configuration we sell, and the heavier 2mm and 2.5mm bands are a choice about proportion rather than safety.
• Four prongs are fine. Six prongs or a bezel buy a little more security and a slightly smaller face-up look.
• A basket or cathedral base spreads impact into the shank, and it is $150 or less on our settings.
• V-prongs on any point, for pear and marquise tips.

A 1ct round faces up about 6.4mm. The full nine-shape table is in how big is a 1 carat diamond.

Most Australian home and contents policies cap unspecified valuables between $1,000 and $3,000 per item, so a $2,400 to $4,200 ring sits right on that line and usually needs to be listed individually. Do it in the same week the ring arrives rather than after the first scare, insure at replacement value with the grading report and a dated valuation on file, and revalue every couple of years because lab-grown replacement pricing moves. Our engagement ring insurance guide covers cost, cover types and the documents insurers ask for.

As of 16 September 2026: loose 1ct lab-grown stones on our feed run $1,027 to about $1,600, every one of them D to F colour at VS1 or better. Settings run $1,260 to $1,910. Complete rings run $2,368 to $4,170, and metal karat, stone grade and overheads explain almost all of that spread. A mined 1 carat of lower grade is $3,910 loose and $9,499 as a finished ring at a mainstream chain.

Browse our lab-grown diamond engagement rings to price a shape and setting, or read the 1 carat size guide to see the weight on the hand. The 2 carat price breakdown runs the same exercise one weight up, where complete rings run about $3,900 to $6,800. We design and price everything from our Melbourne studio, and the same live-feed numbers apply Australia-wide.

Thanks for reading,
Jared and Brie