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Lab Grown Diamond Market

As of April 2026, there are 14,797,678 lab grown diamond listings available across retailers worldwide. The average price per carat is ￥191,594 JPY. Prices have increased by 0.1% over the past 30 days.

Last updated: April 2026

Available by shape

Listing counts across the top 10 most-stocked shapes for this origin.

Round
5.5M
Oval
2.5M
Pear
1.3M
Emerald
1.2M
Radiant
1.1M
Marquise
819K
Cushion
802K
Princess
740K
Heart
384K
Asscher
263K

Price by carat bucket

Average price per carat rises sharply at the 1.00, 2.00 and 3.00ct marks.

0.20-0.29ct
$1.2K
0.30-0.49ct
$1.2K
0.50-0.74ct
$1.1K
0.75-0.99ct
$1.1K
1.00-1.24ct
$1.1K
1.25-1.49ct
$988
1.50-1.99ct
$1.2K
2.00-2.49ct
$1.4K
2.50-2.99ct
$1.4K
3.00-3.99ct
$1.4K
4.00-4.99ct
$1.8K
5.00-9.99ct
$1.8K
10.00+ct
$947
unknownct
$1.6K

Available Shapes

Round
5,549,108 listings
Avg: ￥301,212 JPY/ct
Oval
2,500,513 listings
Avg: ￥212,661 JPY/ct
Pear
1,325,237 listings
Avg: ￥198,618 JPY/ct
Emerald
1,204,677 listings
Avg: ￥189,732 JPY/ct
Radiant
1,135,952 listings
Avg: ￥166,699 JPY/ct
Marquise
819,328 listings
Avg: ￥158,709 JPY/ct
Cushion
801,906 listings
Avg: ￥173,547 JPY/ct
Princess
740,024 listings
Avg: ￥179,722 JPY/ct
Heart
384,497 listings
Avg: ￥173,730 JPY/ct
Asscher
263,332 listings
Avg: ￥162,754 JPY/ct
Other
51,819 listings
Avg: ￥140,245 JPY/ct
Trillion
13,505 listings
Avg: ￥116,889 JPY/ct
Baguette
6,669 listings
Avg: ￥88,533 JPY/ct
Sq_radiant
1,111 listings
Avg: ￥64,415 JPY/ct

By Carat Weight

Carat RangeListingsAvg Price/ct
0.20-0.2991,877￥173,378 JPY
0.30-0.49704,767￥178,589 JPY
0.50-0.741,010,128￥168,455 JPY
0.75-0.99649,923￥160,235 JPY
1.00-1.242,366,105￥166,074 JPY
1.25-1.49700,839￥147,528 JPY
1.50-1.992,757,299￥179,645 JPY
2.00-2.492,232,717￥210,059 JPY
2.50-2.99979,927￥202,635 JPY
3.00-3.991,734,757￥216,169 JPY
4.00-4.99706,024￥265,262 JPY
5.00-9.99730,258￥271,472 JPY
10.00+114,486￥141,275 JPY
unknown18,571￥239,998 JPY