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Round|Lab Grown|IGI

1.51ct D SI1 Round Lab Grown Diamond

EX • D/SI1 • IGI LG478109508

Shape and cutting style on the report: Round brilliant

Certificate IGI LG478109508

Diamond specifications and retailer prices

From $199 USD
As of November 1, 2026
Save $596 USD (75%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $1,158 USD at MOH London · As of October 29, 2026
View at MOH London

About this 1.51ct lab-grown round diamond

This 1.51ct lab-grown round sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG478109508 or 478109508. Listed at 15 retailers as of November 1, 2026, with a 299% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.51
Carat
D
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.7°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG478109508
Dimensions7.53 × 7.49 × 4.38 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.53 mm7.49 mm1.51 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG478109508
Side View
Table 59.0%Crown 32.7°Girdle: MediumPavilion 40.1°Culet: NoneDepth 58.2%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $1,158 USD|Low: $191 USD|High: $2,846 USD|Avg: $465 USD|+0.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 3, 2026
Retailer 7$199 USD
Retailer 10$223 USD
Retailer 3$246 USD
Retailer 9$246 USD
Retailer 8$325 USD
Retailer 2$412 USD
Retailer 4$450 USD
Retailer 11$503 USD
Retailer 5$775 USD
Retailer 6$795 USD
MOH London$1,158 USD

42 data points across 11 retailers

15 retailers$199 USD to $795 USD

A
Cheapest Retailer
-
$199 USD
A
Retailer 2
-
$223 USD
View
Final sale: no returns
A
Retailer 3
-
$231 USD
View
Retailer 4
-
$246 USD
View
Price last confirmed 12 days ago
A
Retailer 5
-
$246 USD
View
A
Retailer 6
-
$281 USD
View
B+
Retailer 7
-
$325 USD
View
A
Retailer 8
-
$412 USD
View
A
Retailer 9
-
$438 USD
View
A
Retailer 10
-
$450 USD
View
B+
Retailer 11
-
$503 USD
View
B+
Retailer 12
-
$775 USD
View
B+
Retailer 13
-
$792 USD
View
B+
Retailer 14
-
$795 USD
View
Most Expensive
MOH London
LG478109508 · Oct 29
$1,158 USD
£912 GBP
View
Price last confirmed 8 days ago
14 more retailers have this diamond
Prices start from $199 USDSave up to $596 USD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.51ct Round
$199 USD