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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 $544 AUD
£300 GBP
As of October 27, 2026
Save $912 AUD (63%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $1,455 AUD 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 $544 to $1,455, a $912 spread on the same certified stone. Brilliant Earth lists it at $1,455. 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

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 27
Current: $1,455 AUD|Low: $237 AUD|High: $1,598 AUD|Avg: $665 AUD|-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$247 AUD
Retailer 6$275 AUD
Retailer 3$287 AUD
Retailer 4$305 AUD
Retailer 11$305 AUD
Retailer 8$515 AUD
Retailer 2$544 AUD
Retailer 13$545 AUD
Retailer 9$781 AUD
Retailer 5$788 AUD
Retailer 12$983 AUD
Retailer 7$1,432 AUD
Brilliant Earth$1,455 AUD

39 data points across 13 retailers

13 retailers$544 AUD to $1,455 AUD

Retailer 1
-
$247 AUD
$173 USD
Price last confirmed 10 days ago
Retailer 2
-
$287 AUD
$201 USD
View
Price last confirmed 9 days ago
Retailer 3
-
$305 AUD
$214 USD
View
Price last confirmed 8 days ago
Retailer 4
-
$305 AUD
$214 USD
View
Price last confirmed 7 days ago
Retailer 5
-
$515 AUD
€344 EUR
View
Price last confirmed 9 days ago
A
Retailer 6
-
$544 AUD
£300 GBP
View
Retailer 7
-
$545 AUD
$382 USD
View
Price last confirmed 8 days ago
B+
Retailer 8
-
$713 AUD
$500 USD
View
Retailer 9
-
$781 AUD
$547 USD
View
Price last confirmed 7 days ago
Retailer 10
-
$788 AUD
$552 USD
View
Price last confirmed 7 days ago
Retailer 11
-
$983 AUD
$689 USD
View
Price last confirmed 8 days ago
B
Retailer 12
-
$1,432 AUD
£790 GBP
View
Most Expensive
B
Brilliant Earth
14997064A · Oct 26
$1,455 AUD
$1,020 USD
View
12 more retailers have this diamond
Prices start from $544 AUDSave up to $912 AUD

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
$544 AUD