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Round|Lab Grown|IGI

1.51ct D SI1 Round Lab Grown Diamond

EX • D/SI1 • IGI LG731538751

Shape and cutting style on the report: Round brilliant

Certificate IGI LG731538751

Diamond specifications and retailer prices

From $300 AUD
As of November 5, 2026
Save $1,451 AUD (83%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $2,257 AUD at Brilliant Earth · As of October 18, 2026
View at Brilliant Earth

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 LG731538751 or 731538751. Listed at 20 retailers as of November 5, 2026, with a 484% 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
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG731538751
Dimensions7.31 × 7.27 × 4.58 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.31 mm7.27 mm1.51 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG731538751
Side View
Table 56.0%Crown 36°Girdle: THN-MEDPavilion 40.8°Culet: NoneDepth 62.8%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $2,257 AUD|Low: $289 AUD|High: $2,257 AUD|Avg: $823 AUD
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 10$300 AUD
Retailer 3$373 AUD
Retailer 11$503 AUD
Retailer 4$577 AUD
Retailer 2$626 AUD
Retailer 5$680 AUD
Retailer 9$824 AUD
Retailer 8$909 AUD
Retailer 7$1,086 AUD
Retailer 6$1,488 AUD
Brilliant Earth$2,257 AUD

41 data points across 11 retailers

20 retailers$300 AUD to $1,751 AUD

A
Cheapest Retailer
-
$300 AUD
A
Retailer 2
-
$336 AUD
View
Final sale: no returns
A
Retailer 3
-
$349 AUD
View
Retailer 4
-
$373 AUD
View
Price last confirmed 12 days ago
A
Retailer 5
-
$373 AUD
View
B+
Retailer 6
-
$503 AUD
View
A
Retailer 7
-
$577 AUD
View
A
Retailer 8
-
$626 AUD
View
A
Retailer 9
-
$633 AUD
View
A
Retailer 10
-
$680 AUD
View
B+
Retailer 11
-
$737 AUD
View
B+
Retailer 12
-
$824 AUD
View
B+
Retailer 13
-
$909 AUD
View
B
Retailer 14
-
$1,086 AUD
View
B
Retailer 15
-
$1,199 AUD
View
Retailer 16
-
$1,203 AUD
View
Price last confirmed 9 days ago
B
Retailer 17
-
$1,273 AUD
View
B
Retailer 18
-
$1,488 AUD
View
B
Retailer 19
-
$1,751 AUD
View
Most Expensive
Brilliant Earth
16956960A · Oct 18
$2,257 AUD
$1,580 USD
View
Price last confirmed 18 days ago
19 more retailers have this diamond
Prices start from $300 AUDSave up to $1,451 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 Round
$300 AUD