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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 $373 AUD
As of November 6, 2026
Save $1,432 AUD (79%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $1,805 AUD 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 $373 to $1,805, a $1,432 spread on the same certified stone. Brilliant Earth lists it at $1,805. 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
Colour
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: $1,805 AUD|Low: $236 AUD|High: $2,940 AUD|Avg: $865 AUD|-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$236 AUD
Retailer 6$373 AUD
Retailer 10$435 AUD
Retailer 7$437 AUD
Retailer 11$492 AUD
Retailer 2$552 AUD
Retailer 12$688 AUD
Retailer 5$821 AUD
Retailer 3$870 AUD
Retailer 4$929 AUD
Retailer 8$1,234 AUD
Retailer 13$1,487 AUD
Brilliant Earth$1,805 AUD

12 data points across 13 retailers

5 retailers$373 AUD to $1,805 AUD

A
Cheapest Retailer
-
$373 AUD
B+
Retailer 2
-
$437 AUD
View
A
Retailer 3
-
$552 AUD
View
B+
Retailer 4
-
$1,109 AUD
View
Most Expensive
B
Brilliant Earth
16423023A · Nov 6
$1,805 AUD
$1,240 USD
View
4 more retailers have this diamond
Prices start from $373 AUDSave up to $1,432 AUD

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
$373 AUD