1 Carat Lab Grown Diamond Price Chart

A loose 1 carat lab-grown diamond costs about $1,122 to $1,602 in Australia, with a median of $1,271. That is the middle 80% of the 527 lab-grown diamonds between 1.00 and 1.09 carats on our live stone feed on 17 September 2026, across eight shapes. Every stone is D to F colour, VS1 to VVS1 clarity and IGI certified, so these charts show what a high-grade 1 carat stone costs today, not a bargain-bin tier.

The charts below break that price down by shape, clarity, colour and carat weight. They are built from real listed stones rather than estimates, and each one is dated. You are welcome to use them, with a link back to this page.

Pear shapes had the lowest median at $1,142 and cushions the highest at $1,504, a spread of about $362. Round, the shape usually described as the most expensive, sat in the middle at $1,242. At 1 carat, shape moves the price by a few hundred dollars at most.

The typical price range is the middle of each shape's listings, with any stone priced above twice its shape's median left out. The typical size is the median length and width across the top of the stone, which is why a 1 carat marquise or pear looks much bigger than a 1 carat round or princess.

VVS1 was the most expensive clarity grade for all eight shapes, by about $110 to $330 over VS1. VS1 and VVS2 were close for most shapes, and on pear and marquise VVS2 was the same price or cheaper. At 1 carat, every one of these grades looks clean to the eye, so VS1 or VVS2 is where the value sits.

Colour did not line up with price the way the grading scale suggests. D and E colour rounds cost about the same, and F colour was the most expensive in every clarity column. At D to F, all three grades are colourless to the eye, so there is no reason to pay more for D.

Ovals followed a similar pattern, with the highest cell an F colour VVS1 stone group. With about ten stones or fewer in each cell, treat any single cell as a guide rather than a fixed price.

Between 1 and 1.49 carats, a round lab-grown diamond climbs steadily, from $1,242 to $1,515 at the median. Then it jumps: the median for 1.50 to 1.59ct stones was $2,473, about 63% more than just below 1.5 carats. From there the price barely moved again up to 1.99ct. The same step appears for oval, pear, princess and marquise, though not every shape. If you are choosing between 1.4 and 1.5 carats, that line is where the money goes.

A loose stone is only part of a ring. Our complete 1 carat engagement rings, with the centre diamond and setting included, cost $2,950 to $4,500 as of 17 September 2026. The 1 carat lab diamond ring price guide compares complete ring prices across Australian jewellers, and our 1 carat engagement rings show live prices.

Every figure on this page comes from the Lily Dia live lab-grown diamond feed on 17 September 2026: 527 loose stones between 1.00 and 1.09 carats, plus the wider carat steps shown in the last chart. Prices are in Australian dollars, as listed to Australian customers. We report medians rather than averages, so a few unusually priced stones do not skew the figures, and stock changes daily, so any single stone may no longer be listed. Asscher and heart shapes had no stones at 1 carat on that day and are not shown.

If you would like to reference these charts, please cite Lily Dia Jewellery and link to this page.

Thanks for reading, Jared and Brie