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Radiant|Lab Grown|IGI

1.25ct G SI1 Radiant Lab Grown Diamond

ID • G/SI1 • IGI LG512205072

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

Certificate IGI LG512205072

Diamond specifications and retailer prices

From $1,344 NZD
As of November 6, 2026
Save $3,040 NZD (69%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $6,121 NZD at MOH London · As of November 3, 2026
View at MOH London

About this 1.25ct lab-grown radiant diamond

This 1.25ct lab-grown radiant sits in the one-and-a-quarter to one-and-a-half carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG512205072 or 512205072. Listed at 13 retailers as of November 6, 2026, with a 226% 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

1.25
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle46.7°
Pavilion angle29.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG512205072
Dimensions7.31 × 5.41 × 3.51 mm
L/W Ratio1.35
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
7.31 mm5.41 mm1.25 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG512205072
Side View
Table 66.0%Crown 46.7°Girdle: MED-STKPavilion 29.7°Culet: NoneDepth 64.9%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $6,121 NZD|Low: $1,290 NZD|High: $6,195 NZD|Avg: $2,580 NZD|-1.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 6$1,344 NZD
Retailer 11$1,463 NZD
Retailer 3$1,503 NZD
Retailer 8$1,559 NZD
Retailer 4$1,876 NZD
Retailer 7$1,948 NZD
Retailer 2$2,477 NZD
Retailer 10$2,524 NZD
Retailer 5$3,839 NZD
Retailer 9$4,383 NZD
MOH London$6,121 NZD

43 data points across 11 retailers

13 retailers$1,344 NZD to $4,383 NZD

B+
Cheapest Retailer
-
$1,344 NZD
B+
Retailer 2
-
$1,463 NZD
View
B
Retailer 3
-
$1,503 NZD
View
Final sale: no returns
B
Retailer 4
-
$1,559 NZD
View
Retailer 5
-
$1,559 NZD
View
Price last confirmed 26 days ago
B
Retailer 6
-
$1,876 NZD
View
B
Retailer 7
-
$1,948 NZD
View
B
Retailer 8
-
$2,477 NZD
View
B
Retailer 9
-
$2,524 NZD
View
B
Retailer 10
-
$3,839 NZD
View
B
Retailer 11
-
$4,383 NZD
View
Retailer 12
-
$4,847 NZD
View
Price under review
Most Expensive
MOH London
LG512205072 · Nov 3
$6,121 NZD
£2,672 GBP
View
Price under review
12 more retailers have this diamond
Prices start from $1,344 NZDSave up to $3,040 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.

B+
1.25ct Radiant
$1,344 NZD