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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 $374 NZD
As of November 5, 2026
Save $1,807 NZD (83%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $2,811 NZD 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

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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 5
Current: $2,811 NZD|Low: $374 NZD|High: $2,811 NZD|Avg: $1,118 NZD
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$374 NZD
Retailer 4$418 NZD
Retailer 15$464 NZD
Retailer 14$626 NZD
Retailer 2$779 NZD
Retailer 5$788 NZD
Retailer 8$847 NZD
Retailer 3$918 NZD
Retailer 12$1,026 NZD
Retailer 11$1,131 NZD
Retailer 10$1,352 NZD
Retailer 6$1,585 NZD
Retailer 9$1,854 NZD
Retailer 7$2,181 NZD
Brilliant Earth$2,811 NZD

42 data points across 15 retailers

19 retailers$374 NZD to $2,181 NZD

A
Cheapest Retailer
-
$374 NZD
A
Retailer 2
-
$418 NZD
View
Final sale: no returns
A
Retailer 3
-
$434 NZD
View
Retailer 4
-
$464 NZD
View
Price last confirmed 12 days ago
A
Retailer 5
-
$464 NZD
View
B+
Retailer 6
-
$626 NZD
View
A
Retailer 7
-
$779 NZD
View
A
Retailer 8
-
$788 NZD
View
A
Retailer 9
-
$847 NZD
View
B+
Retailer 10
-
$918 NZD
View
B+
Retailer 11
-
$1,026 NZD
View
B+
Retailer 12
-
$1,131 NZD
View
B
Retailer 13
-
$1,352 NZD
View
B
Retailer 14
-
$1,492 NZD
View
Retailer 15
-
$1,498 NZD
View
Price last confirmed 9 days ago
B
Retailer 16
-
$1,585 NZD
View
B
Retailer 17
-
$1,854 NZD
View
B
Retailer 18
-
$2,181 NZD
View
Most Expensive
Brilliant Earth
16956672A · Oct 18
$2,811 NZD
$1,580 USD
View
Price last confirmed 18 days ago
18 more retailers have this diamond
Prices start from $374 NZDSave up to $1,807 NZD

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
$374 NZD