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Radiant|Lab Grown|IGI

1.51ct D SI1 Radiant Lab Grown Diamond

ID • D/SI1 • IGI LG542235603

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG542235603

Diamond specifications and retailer prices

From $256 USD
As of November 6, 2026
Save $984 USD (79%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $1,240 USD at Brilliant Earth · As of November 6, 2026
View at Brilliant Earth

About this 1.51ct lab-grown radiant diamond

This 1.51ct lab-grown radiant 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 LG542235603 or 542235603. Listed at 5 retailers as of November 6, 2026, with prices from $256 to $1,240, a $984 spread on the same certified stone. Brilliant Earth lists it at $1,240. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44°
Pavilion angle33.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG542235603
Dimensions7.78 × 5.58 × 3.93 mm
L/W Ratio1.39
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
7.78 mm5.58 mm1.51 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG542235603
Side View
Table 64.5%Crown 44°Girdle: Slightly ThickPavilion 33.3°Culet: NoneDepth 70.4%

Caratlytics Score

How it works →
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 6
Current: $1,240 USD|Low: $162 USD|High: $2,020 USD|Avg: $594 USD|-38.6%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 6, 2026
Retailer 9$162 USD
Retailer 6$256 USD
Retailer 10$299 USD
Retailer 7$300 USD
Retailer 11$338 USD
Retailer 2$379 USD
Retailer 12$473 USD
Retailer 5$564 USD
Retailer 3$598 USD
Retailer 4$638 USD
Retailer 8$848 USD
Retailer 13$1,022 USD
Brilliant Earth$1,240 USD

12 data points across 13 retailers

5 retailers$256 USD to $1,240 USD

A
Cheapest Retailer
-
$256 USD
B+
Retailer 2
-
$300 USD
View
A
Retailer 3
-
$379 USD
View
B+
Retailer 4
-
$762 USD
View
Most Expensive
B
Brilliant Earth
16423023A · Nov 6
$1,240 USD
View
4 more retailers have this diamond
Prices start from $256 USDSave up to $984 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 Radiant
$256 USD