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 $745 USD
As of October 30, 2026
Save $1,685 USD (69%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $3,393 USD at MOH London · As of November 1, 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 October 30, 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
Color
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: Oct 30
Current: $3,393 USD|Low: $715 USD|High: $3,434 USD|Avg: $1,417 USD|-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 2, 2026
Retailer 6$745 USD
Retailer 11$811 USD
Retailer 3$833 USD
Retailer 8$864 USD
Retailer 4$1,040 USD
Retailer 7$1,080 USD
Retailer 2$1,388 USD
Retailer 10$1,399 USD
Retailer 5$2,128 USD
Retailer 9$2,430 USD
MOH London$3,393 USD

42 data points across 11 retailers

13 retailers$745 USD to $2,430 USD

B+
Cheapest Retailer
-
$745 USD
B+
Retailer 2
-
$811 USD
View
B
Retailer 3
-
$833 USD
View
Final sale: no returns
B
Retailer 4
-
$864 USD
View
Retailer 5
-
$864 USD
View
Price last confirmed 21 days ago
B
Retailer 6
-
$1,040 USD
View
B
Retailer 7
-
$1,080 USD
View
B
Retailer 8
-
$1,388 USD
£1,093 GBP
View
B
Retailer 9
-
$1,399 USD
View
B
Retailer 10
-
$2,128 USD
View
B
Retailer 11
-
$2,430 USD
View
Retailer 12
-
$2,688 USD
View
Price under review
Most Expensive
MOH London
LG512205072 · Nov 1
$3,393 USD
£2,672 GBP
View
Price under review
12 more retailers have this diamond
Prices start from $745 USDSave up to $1,685 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.

B+
1.25ct Radiant
$745 USD