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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 $677 NZD
£300 GBP
As of October 27, 2026
Save $1,106 NZD (62%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $1,813 NZD 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 a 163% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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: $1,813 NZD|Low: $295 NZD|High: $1,991 NZD|Avg: $828 NZD|-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$307 NZD
Retailer 6$343 NZD
Retailer 3$357 NZD
Retailer 4$380 NZD
Retailer 11$380 NZD
Retailer 8$642 NZD
Retailer 2$677 NZD
Retailer 13$679 NZD
Retailer 9$972 NZD
Retailer 5$981 NZD
Retailer 12$1,225 NZD
Retailer 7$1,783 NZD
Brilliant Earth$1,813 NZD

39 data points across 13 retailers

13 retailers$677 NZD to $1,783 NZD

Retailer 1
-
$307 NZD
$173 USD
Price last confirmed 10 days ago
Retailer 2
-
$357 NZD
$201 USD
View
Price last confirmed 9 days ago
Retailer 3
-
$380 NZD
$214 USD
View
Price last confirmed 8 days ago
Retailer 4
-
$380 NZD
$214 USD
View
Price last confirmed 8 days ago
Retailer 5
-
$642 NZD
€344 EUR
View
Price last confirmed 10 days ago
A
Retailer 6
-
$677 NZD
£300 GBP
View
Retailer 7
-
$679 NZD
$382 USD
View
Price last confirmed 8 days ago
B+
Retailer 8
-
$889 NZD
$500 USD
View
Retailer 9
-
$972 NZD
$547 USD
View
Price last confirmed 7 days ago
Retailer 10
-
$981 NZD
$552 USD
View
Price last confirmed 7 days ago
Retailer 11
-
$1,225 NZD
$689 USD
View
Price last confirmed 8 days ago
B
Retailer 12
-
$1,783 NZD
£790 GBP
View
Most Expensive
B
Brilliant Earth
14997064A · Oct 26
$1,813 NZD
$1,020 USD
View
Price last confirmed 7 days ago
12 more retailers have this diamond
Prices start from $677 NZDSave up to $1,106 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
1.55ct Radiant
$677 NZD