Search 1 Carat Lab Grown Diamonds

The cost will begin at $670 and rise up to more than $1,500 based on the cut, color, and clarity of the diamond. The sweet spot for a well-cut stone in the G-H color range with VS2-SI1 clarity sits between $800 and $1,100. Our AI price scores flag which stones are priced fairly for their grade — so you're not paying a premium for specs that don't affect how a 1 carat lab diamond actually looks worn.

No — a 0.05ct difference at this size is not visible once a stone is set. What it does affect is price. Stones just under or just over the benchmark offer identical visual presence at a meaningfully different cost. Filtering between 0.95ct and 1.09ct gives you more options without compromising what you actually see — one of the easiest ways to stretch your budget on a 1ct lab diamond.

At this weight, G or H color is the practical sweet spot — neither reads yellow to the naked eye, but both cost significantly less than D-F stones. For clarity, VS2 or SI1 is sufficient in most cases — inclusions at this grade are not visible without magnification. Going higher on either scale rarely produces a visible difference. Money is better spent on cut, which has the most direct impact on how a 1 carat lab grown diamond looks.

Every stone receives an AI-generated quality score out of 18, based on cut, color, clarity, and price relative to comparable stones. Scores are generated independently — Rare Carat doesn't sell its own inventory, so there's no incentive to push one stone over another. With nearly 20,000 stones at this size, the score cuts through the volume and tells you which 1ct lab diamonds are genuinely worth it — without the back-and-forth.

On Rare Carat, a 1ct lab grown diamond ranges from $670 to $1,500+ depending on cut, color, and clarity. Price is driven almost entirely by the 4Cs — here's how each tier breaks down based on live inventory:


Cut has the largest impact on how a stone actually looks. Color and clarity adjustments are where most buyers find value without visible compromise. Every stone on Rare Carat is scored by our AI price and quality tool — so you can see exactly where each stone sits relative to comparable diamonds before buying.

Prices based on live Rare Carat inventory. Updated regularly.