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Radiant|Lab Grown|IGI

1.55ct G SI1 Radiant Lab Grown Diamond

EX • G/SI1 • IGI LG619423774

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

Certificate IGI LG619423774

Diamond specifications and retailer prices

From £284 GBP
As of October 27, 2026
Save £477 GBP (63%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £761 GBP at Brilliant Earth · As of October 26, 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 G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG619423774 or 619423774. Listed at 13 retailers as of October 26, 2026, with prices from £284 to £761, a £477 spread on the same certified stone. Brilliant Earth lists it at £761. 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
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle48.7°
Pavilion angle33.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG619423774
Dimensions8.45 × 5.58 × 3.75 mm
L/W Ratio1.51
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
8.45 mm5.58 mm1.55 ctG / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG619423774
Side View
Table 64.0%Crown 48.7°Girdle: MediumPavilion 33.9°Culet: NoneDepth 67.2%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 27
Current: £761 GBP|Low: £124 GBP|High: £836 GBP|Avg: £348 GBP|-8.9%
Brilliant Earth
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 27, 2026
Retailer 10£129 GBP
Retailer 6£144 GBP
Retailer 3£150 GBP
Retailer 4£160 GBP
Retailer 11£160 GBP
Retailer 8£270 GBP
Retailer 2£284 GBP
Retailer 13£285 GBP
Retailer 9£408 GBP
Retailer 5£412 GBP
Retailer 12£514 GBP
Retailer 7£749 GBP
Brilliant Earth£761 GBP

39 data points across 13 retailers

13 retailers£284 GBP to £761 GBP

Retailer 1
-
£129 GBP
$173 USD
Price last confirmed 9 days ago
Retailer 2
-
£150 GBP
$201 USD
View
Price last confirmed 8 days ago
Retailer 3
-
£160 GBP
$214 USD
View
Price last confirmed 7 days ago
Retailer 4
-
£160 GBP
$214 USD
View
Price last confirmed 7 days ago
Retailer 5
-
£270 GBP
€344 EUR
View
Price last confirmed 9 days ago
A
Retailer 6
-
£284 GBP
View
Retailer 7
-
£285 GBP
$382 USD
View
Price last confirmed 7 days ago
B+
Retailer 8
-
£373 GBP
$500 USD
View
B+
Retailer 9
-
£408 GBP
$547 USD
View
B+
Retailer 10
-
£412 GBP
$552 USD
View
Retailer 11
-
£514 GBP
$689 USD
View
Price last confirmed 7 days ago
B
Retailer 12
-
£749 GBP
View
Most Expensive
B
Brilliant Earth
14997064A · Oct 26
£761 GBP
$1,020 USD
View
12 more retailers have this diamond
Prices start from £284 GBPSave up to £477 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
1.55ct Radiant
£284 GBP