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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 £309 GBP
$411 USD
As of October 28, 2026
Save £795 GBP (72%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £1,104 GBP 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 £309 to £1,104, a £795 spread on the same certified stone. Brilliant Earth lists it at £1,104. 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

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 28
Current: £1,104 GBP|Low: £115 GBP|High: £1,164 GBP|Avg: £516 GBP|-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£159 GBP
Retailer 6£309 GBP
Retailer 2£319 GBP
Retailer 3£330 GBP
Retailer 9£421 GBP
Retailer 7£433 GBP
Retailer 4£568 GBP
Retailer 10£792 GBP
Retailer 5£828 GBP
Brilliant Earth£1,104 GBP

36 data points across 10 retailers

10 retailers£309 GBP to £1,104 GBP

A
Retailer 1
-
£165 GBP
$220 USD
Price last confirmed 32 days ago
A
Retailer 2
-
£174 GBP
$232 USD
View
Price last confirmed 32 days ago
B+
Retailer 3
-
£309 GBP
$411 USD
View
A
Retailer 4
-
£319 GBP
View
A
Retailer 5
-
£330 GBP
€419 EUR
View
B+
Retailer 6
-
£421 GBP
$561 USD
View
B+
Retailer 7
-
£433 GBP
$576 USD
View
B+
Retailer 8
-
£568 GBP
$757 USD
View
B
Retailer 9
-
£828 GBP
View
Most Expensive
B
Brilliant Earth
8073062A · Oct 28
£1,104 GBP
$1,470 USD
View
9 more retailers have this diamond
Prices start from £309 GBPSave up to £795 GBP

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
£309 GBP