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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 $384 USD
As of October 30, 2026
Save $856 USD (69%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $1,240 USD at Brilliant Earth · As of October 29, 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 29, 2026, with prices from $384 to $1,240, a $856 spread on the same certified stone. Brilliant Earth lists it at $1,240. 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
Color
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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $1,240 USD|Low: $140 USD|High: $1,330 USD|Avg: $583 USD|-6.8%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 30, 2026
Retailer 7$194 USD
Retailer 6$384 USD
Retailer 2$384 USD
Retailer 4$406 USD
Retailer 9$465 USD
Retailer 8$552 USD
Retailer 3$730 USD
Retailer 5$1,010 USD
Brilliant Earth$1,240 USD

38 data points across 9 retailers

11 retailers$384 USD to $1,240 USD

Retailer 1
-
$201 USD
Price last confirmed 32 days ago
Retailer 2
-
$212 USD
View
Price last confirmed 32 days ago
B+
Retailer 3
-
$384 USD
View
A
Retailer 4
-
$384 USD
£303 GBP
View
A
Retailer 5
-
$406 USD
€387 EUR
View
B+
Retailer 6
-
$465 USD
View
B+
Retailer 7
-
$552 USD
View
B
Retailer 8
-
$730 USD
View
B+
Retailer 9
-
$756 USD
£595 GBP
View
Retailer 10
-
$1,010 USD
£795 GBP
View
Price last confirmed 9 days ago
Most Expensive
B
Brilliant Earth
8177429A · Oct 29
$1,240 USD
View
10 more retailers have this diamond
Prices start from $384 USDSave up to $856 USD

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
$384 USD