Monthly Analysis
September 2025 Diamond Market Report
Data as of September 30, 2025
Diamond Market Snapshot
In September 2025, the CaratRadar Diamond Price Index stood at $4,265, reflecting the weighted average retail price across 5,187,336 certified diamonds tracked from leading diamond retailers worldwide. Natural diamonds averaged $6,621 compared to $2,761 for lab-grown equivalents, a ratio of 2.4x.
Shape-by-Shape Analysis
Month-over-month price changes by shape and diamond type.
Round
Lab Grown
$2,603
1,038,757 diamonds
vs last month
-8.7%Natural
$5,334
1,094,901 diamonds
vs last month
+2.1%Oval
Lab Grown
$3,381
449,310 diamonds
vs last month
-8.1%Natural
$9,219
211,441 diamonds
vs last month
-0.6%Cushion
Lab Grown
$3,215
214,159 diamonds
vs last month
-3.6%Natural
$11,197
99,873 diamonds
vs last month
+2.2%Princess
Lab Grown
$2,365
193,692 diamonds
vs last month
-5.1%Natural
$7,173
82,005 diamonds
vs last month
-5%Emerald
Lab Grown
$2,715
343,196 diamonds
vs last month
-1.5%Natural
$7,224
196,141 diamonds
vs last month
+2.5%Pear
Lab Grown
$2,440
299,923 diamonds
vs last month
-4.4%Natural
$6,076
144,877 diamonds
vs last month
-3.2%Marquise
Lab Grown
$2,417
169,380 diamonds
vs last month
+1.8%Natural
$6,396
38,703 diamonds
vs last month
+0.9%Radiant
Lab Grown
$2,889
307,631 diamonds
vs last month
-3.9%Natural
$13,236
58,406 diamonds
vs last month
+5.2%Heart
Lab Grown
$2,632
102,305 diamonds
vs last month
-3.1%Natural
$5,463
65,083 diamonds
vs last month
+1.2%Asscher
Lab Grown
$2,966
48,524 diamonds
vs last month
+1.6%Natural
$7,172
29,029 diamonds
vs last month
+5.8%Key Takeaways
- ✓Lab-grown diamonds continue to offer significant value compared to natural equivalents.
- ✓Round and oval cuts remain the most liquid market segments with the most comparable listings.
- ✓Price spreads between retailers vary significantly, so use CaratRadar to find the best price for the exact same certified stone.
About This Report
This report is generated automatically from CaratRadar's live diamond pricing database, which aggregates daily data from major diamond retailers. All prices are averages across active listings and may not reflect individual diamond prices. Data updated daily.
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