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Round|Lab Grown|IGI

1.51ct D SI1 Round Lab Grown Diamond

EX • D/SI1 • IGI LG712532258

Shape and cutting style on the report: Round brilliant

Certificate IGI LG712532258

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)
19 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 LG712532258 or 712532258. Listed at 19 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 angle36.3°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG712532258
Dimensions7.27 × 7.23 × 4.55 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.27 mm7.23 mm1.51 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG712532258
Side View
Table 59.0%Crown 36.3°Girdle: MED-STKPavilion 40.9°Culet: NoneDepth 62.7%

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 5
Current: $2,257 AUD|Low: $300 AUD|High: $2,257 AUD|Avg: $898 AUD
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
Retailer 14
Retailer 15
November 6, 2026
Retailer 13$300 AUD
Retailer 4$336 AUD
Retailer 15$373 AUD
Retailer 14$503 AUD
Retailer 2$626 AUD
Retailer 5$633 AUD
Retailer 8$680 AUD
Retailer 3$737 AUD
Retailer 12$824 AUD
Retailer 11$909 AUD
Retailer 10$1,086 AUD
Retailer 6$1,273 AUD
Retailer 9$1,488 AUD
Retailer 7$1,751 AUD
Brilliant Earth$2,257 AUD

42 data points across 15 retailers

19 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
-
$626 AUD
View
A
Retailer 8
-
$633 AUD
View
A
Retailer 9
-
$680 AUD
View
B+
Retailer 10
-
$737 AUD
View
B+
Retailer 11
-
$824 AUD
View
B+
Retailer 12
-
$909 AUD
View
B
Retailer 13
-
$1,086 AUD
View
B
Retailer 14
-
$1,199 AUD
View
Retailer 15
-
$1,203 AUD
View
Price last confirmed 9 days ago
B
Retailer 16
-
$1,273 AUD
View
B
Retailer 17
-
$1,488 AUD
View
B
Retailer 18
-
$1,751 AUD
View
Most Expensive
Brilliant Earth
16956672A · Oct 18
$2,257 AUD
$1,580 USD
View
Price last confirmed 18 days ago
18 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