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Cushion|Lab Grown|IGI

1.51ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG519231898

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG519231898

Diamond specifications and retailer prices

From $373 NZD
As of November 6, 2026
Save $1,697 NZD (82%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $2,071 NZD at Reve Diamonds · As of November 6, 2026
View at Reve Diamonds

About this 1.51ct lab-grown cushion diamond

This 1.51ct lab-grown cushion sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG519231898 or 519231898. Listed at 13 retailers as of November 6, 2026, with prices from $373 to $2,071, a $1,697 spread on the same certified stone. Reve Diamonds lists it at $2,071. 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
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33°
Pavilion angle33.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG519231898
Dimensions6.71 × 6.64 × 4.00 mm
L/W Ratio1.01
Girdle conditionFaceted
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
6.71 mm6.64 mm1.51 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG519231898
Side View
Table 62.5%Crown 33°Girdle: MED-THKPavilion 33.6°Culet: NoneDepth 60.2%

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 6
Current: $740 NZD|Low: $373 NZD|High: $2,002 NZD|Avg: $942 NZD|+3.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 5, 2026
Retailer 10$373 NZD
Retailer 8$415 NZD
Retailer 7$559 NZD
Retailer 4$684 NZD
Retailer 1$740 NZD
Retailer 2$826 NZD
Retailer 5$989 NZD
Retailer 9$1,017 NZD
Retailer 6$1,642 NZD
Retailer 3$1,941 NZD

42 data points across 10 retailers

13 retailers$373 NZD to $2,071 NZD

A
Cheapest Retailer
-
$373 NZD
Final sale: no returns
Retailer 2
-
$415 NZD
View
Price last confirmed 12 days ago
B+
Retailer 3
-
$559 NZD
View
A
Retailer 4
-
$684 NZD
View
A
Retailer 5
-
$740 NZD
View
A
Retailer 6
-
$810 NZD
View
A
Retailer 7
-
$826 NZD
View
A
Retailer 8
-
$989 NZD
View
B+
Retailer 9
-
$1,017 NZD
View
B+
Retailer 10
-
$1,432 NZD
View
B+
Retailer 11
-
$1,642 NZD
View
B
Retailer 12
-
$1,941 NZD
View
Most Expensive
B
Reve Diamonds
51A9E8EA3 · Nov 6
$2,071 NZD
$1,148 USD
View
12 more retailers have this diamond
Prices start from $373 NZDSave up to $1,697 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 Cushion
$373 NZD