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Cushion|Lab Grown|IGI

1.80ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG587384143

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG587384143

Diamond specifications and retailer prices

From $493 NZD
$277 USD
As of October 30, 2026
Save $4,314 NZD (90%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $4,807 NZD at Do Amore Diamonds · As of October 29, 2026
View at Do Amore Diamonds

About this 1.8ct lab-grown cushion diamond

This 1.8ct 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 LG587384143 or 587384143. Listed at 17 retailers as of October 29, 2026, with prices from $493 to $4,807, a $4,314 spread on the same certified stone. Do Amore Diamonds lists it at $4,807. 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

1.80
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle38.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG587384143
Dimensions7.22 × 6.92 × 4.64 mm
L/W Ratio1.04
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
7.22 mm6.92 mm1.80 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG587384143
Side View
Table 62.0%Crown 35°Girdle: MED-THKPavilion 38.7°Culet: NoneDepth 67.1%

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: Oct 30
Current: $4,807 NZD|Low: $493 NZD|High: $4,807 NZD|Avg: $1,632 NZD|+13.9%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 30, 2026
Retailer 5$493 NZD
Retailer 9$669 NZD
Retailer 7$890 NZD
Retailer 10$890 NZD
Retailer 2$950 NZD
Retailer 11$979 NZD
Retailer 6$1,325 NZD
Retailer 4$1,772 NZD
Retailer 3$2,185 NZD
Retailer 12$2,663 NZD
Retailer 13$2,723 NZD
Retailer 8$2,969 NZD
Do Amore Diamonds$4,807 NZD

41 data points across 13 retailers

17 retailers$493 NZD to $4,807 NZD

A
Cheapest Retailer
-
$493 NZD
$277 USD
Final sale: no returns
A
Retailer 2
-
$669 NZD
$376 USD
View
Retailer 3
-
$773 NZD
£342 GBP
View
Price last confirmed 37 days ago
A
Retailer 4
-
$890 NZD
$500 USD
View
A
Retailer 5
-
$890 NZD
$500 USD
View
A
Retailer 6
-
$950 NZD
£420 GBP
View
A
Retailer 7
-
$979 NZD
$550 USD
View
B+
Retailer 8
-
$1,325 NZD
£586 GBP
View
B+
Retailer 9
-
$1,772 NZD
$995 USD
View
Retailer 10
-
$1,939 NZD
$1,089 USD
View
Price last confirmed 63 days ago
B
Retailer 11
-
$2,062 NZD
CA$1,609 CAD
View
B
Retailer 12
-
$2,185 NZD
$1,227 USD
View
B
Retailer 13
-
$2,663 NZD
$1,496 USD
View
B
Retailer 14
-
$2,723 NZD
SGD 2,067 SGD
View
B
Retailer 15
-
$2,969 NZD
£1,313 GBP
View
Retailer 16
-
$4,149 NZD
$2,330 USD
View
Price last confirmed 29 days ago
Most Expensive
B
Do Amore Diamonds
27-70838E392 · Oct 29
$4,807 NZD
$2,700 USD
View
16 more retailers have this diamond
Prices start from $493 NZDSave up to $4,314 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
1.80ct Cushion
$493 NZD