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Radiant|Lab Grown|IGI

1.55ct E SI1 Radiant Lab Grown Diamond

ID • E/SI1 • IGI LG600355829

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG600355829

Diamond specifications and retailer prices

From $681 NZD
$384 USD
As of October 30, 2026
Save $1,288 NZD (65%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $1,969 NZD at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 1.55ct lab-grown radiant diamond

This 1.55ct lab-grown radiant 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 LG600355829 or 600355829. Listed at 11 retailers as of October 30, 2026, with prices from $681 to $1,969, a $1,288 spread on the same certified stone. Brilliant Earth lists it at $1,969. 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

1.55
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.6°
Pavilion angle35.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG600355829
Dimensions8.31 × 5.68 × 3.86 mm
L/W Ratio1.46
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
8.31 mm5.68 mm1.55 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG600355829
Side View
Table 65.0%Crown 43.6°Girdle: MediumPavilion 35.4°Culet: NoneDepth 68.0%

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: Oct 30
Current: $1,969 NZD|Low: $248 NZD|High: $2,360 NZD|Avg: $1,036 NZD|-16.5%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 30, 2026
Retailer 7$344 NZD
Retailer 6$681 NZD
Retailer 2$682 NZD
Retailer 4$721 NZD
Retailer 9$825 NZD
Retailer 8$979 NZD
Retailer 3$1,295 NZD
Retailer 5$1,791 NZD
Brilliant Earth$1,969 NZD

37 data points across 9 retailers

11 retailers$681 NZD to $1,969 NZD

Retailer 1
-
$357 NZD
$201 USD
Price last confirmed 33 days ago
Retailer 2
-
$376 NZD
$212 USD
View
Price last confirmed 33 days ago
B+
Retailer 3
-
$681 NZD
$384 USD
View
A
Retailer 4
-
$682 NZD
£303 GBP
View
Retailer 5
-
$721 NZD
€387 EUR
View
Price last confirmed 7 days ago
A
Retailer 6
-
$825 NZD
$465 USD
View
B+
Retailer 7
-
$979 NZD
$552 USD
View
B
Retailer 8
-
$1,295 NZD
$730 USD
View
B+
Retailer 9
-
$1,341 NZD
£595 GBP
View
Retailer 10
-
$1,791 NZD
£795 GBP
View
Price last confirmed 10 days ago
Most Expensive
B
Brilliant Earth
8177429A · Oct 30
$1,969 NZD
$1,110 USD
View
10 more retailers have this diamond
Prices start from $681 NZDSave up to $1,288 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
1.55ct Radiant
$681 NZD