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Cushion|Lab Grown|IGI

1.51ct H SI1 Cushion Lab Grown Diamond

GD • H/SI1 • IGI LG459193109

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG459193109

Diamond specifications and retailer prices

From $484 NZD
$273 USD
As of November 1, 2026
Save $1,886 NZD (80%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $20,748 NZD at Allurez · As of October 26, 2026
View at Allurez

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 H colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade and certified by IGI LG459193109 or 459193109. Listed at 11 retailers as of November 1, 2026, with a 389% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.51
Carat
H
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.8°
Pavilion angle37.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG459193109
Dimensions7.08 × 6.59 × 4.27 mm
L/W Ratio1.07
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
7.08 mm6.59 mm1.51 ctH / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG459193109
Side View
Table 63.0%Crown 34.8°Girdle: MED-THKPavilion 37.8°Culet: NoneDepth 64.8%

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 1
Current: $1,411 NZD|Low: $440 NZD|High: $2,432 NZD|Avg: $1,181 NZD|-0.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 8$484 NZD
Retailer 2$562 NZD
Retailer 5$759 NZD
Retailer 7$841 NZD
Retailer 11$852 NZD
Retailer 3$868 NZD
Retailer 6$981 NZD
Retailer 1$1,411 NZD
Retailer 10$1,822 NZD
Retailer 4$2,156 NZD
Retailer 9$2,370 NZD

19 data points across 11 retailers

11 retailers$484 NZD to $2,370 NZD

A
Cheapest Retailer
-
$484 NZD
$273 USD
Final sale: no returns
Retailer 2
-
$562 NZD
$317 USD
View
Price last confirmed 8 days ago
B
Retailer 3
-
$759 NZD
$428 USD
View
B+
Retailer 4
-
$841 NZD
$474 USD
View
Retailer 5
-
$852 NZD
$480 USD
View
Price last confirmed 7 days ago
B+
Retailer 6
-
$981 NZD
$553 USD
View
B+
Retailer 7
-
$1,411 NZD
$795 USD
View
B+
Retailer 8
-
$1,822 NZD
$1,027 USD
View
B+
Retailer 9
-
$2,156 NZD
£957 GBP
View
B+
Retailer 10
-
$2,370 NZD
$1,336 USD
View
Most Expensive
Allurez
3132972 · Oct 26
$20,748 NZD
$11,693 USD
View
Price under review
10 more retailers have this diamond
Prices start from $484 NZDSave up to $1,886 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
$484 NZD