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Radiant|Lab Grown|IGI

1.72ct E SI1 Radiant Lab Grown Diamond

ID • E/SI1 • IGI LG594321721

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

Certificate IGI LG594321721

Diamond specifications and retailer prices

From $732 NZD
$411 USD
As of October 28, 2026
Save $1,886 NZD (72%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $2,617 NZD at Brilliant Earth · As of October 28, 2026
View at Brilliant Earth

About this 1.72ct lab-grown radiant diamond

This 1.72ct 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 LG594321721 or 594321721. Listed at 10 retailers as of October 28, 2026, with prices from $732 to $2,617, a $1,886 spread on the same certified stone. Brilliant Earth lists it at $2,617. 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

1.72
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.5°
Pavilion angle34.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG594321721
Dimensions8.56 × 5.85 × 4.00 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
8.56 mm5.85 mm1.72 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG594321721
Side View
Table 65.0%Crown 44.5°Girdle: MediumPavilion 34.9°Culet: NoneDepth 68.4%

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 28
Current: $2,617 NZD|Low: $272 NZD|High: $2,760 NZD|Avg: $1,224 NZD|-5.2%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 29, 2026
Retailer 8$377 NZD
Retailer 6$732 NZD
Retailer 2$757 NZD
Retailer 3$783 NZD
Retailer 9$999 NZD
Retailer 7$1,026 NZD
Retailer 4$1,348 NZD
Retailer 10$1,877 NZD
Retailer 5$1,963 NZD
Brilliant Earth$2,617 NZD

36 data points across 10 retailers

10 retailers$732 NZD to $2,617 NZD

A
Retailer 1
-
$392 NZD
$220 USD
Price last confirmed 32 days ago
A
Retailer 2
-
$413 NZD
$232 USD
View
Price last confirmed 32 days ago
B+
Retailer 3
-
$732 NZD
$411 USD
View
A
Retailer 4
-
$757 NZD
£335 GBP
View
A
Retailer 5
-
$783 NZD
€419 EUR
View
B+
Retailer 6
-
$999 NZD
$561 USD
View
B+
Retailer 7
-
$1,026 NZD
$576 USD
View
B+
Retailer 8
-
$1,348 NZD
$757 USD
View
B
Retailer 9
-
$1,963 NZD
£868 GBP
View
Most Expensive
B
Brilliant Earth
8073062A · Oct 28
$2,617 NZD
$1,470 USD
View
9 more retailers have this diamond
Prices start from $732 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
1.72ct Radiant
$732 NZD