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Round|Lab Grown|IGI

1.21ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG455028355

Shape and cutting style on the report: Round brilliant

Certificate IGI LG455028355

Diamond specifications and retailer prices

From $332 USD
As of November 1, 2026
Save $839 USD (72%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $1,171 USD at MOH London · As of November 1, 2026
View at MOH London

About this 1.21ct lab-grown round diamond

This 1.21ct lab-grown round sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG455028355 or 455028355. Listed at 7 retailers as of November 1, 2026, with prices from $332 to $1,171, a $839 spread on the same certified stone. MOH London lists it at $1,171. 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

1.21
Carat
G
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.1°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG455028355
Dimensions6.86 × 6.82 × 4.17 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory grown diamond was created by chemical vapor deposition process (CVD).
Top View
6.86 mm6.82 mm1.21 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG455028355
Side View
Table 57.5%Crown 34.1°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 61.0%

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: Nov 1
Current: $1,171 USD|Low: $265 USD|High: $1,185 USD|Avg: $545 USD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 2, 2026
Retailer 5$265 USD
Retailer 7$332 USD
Retailer 4$455 USD
Retailer 3$465 USD
Retailer 2$546 USD
Retailer 6$582 USD
MOH London$1,171 USD

40 data points across 7 retailers

7 retailers$332 USD to $1,171 USD

Retailer 1
-
$265 USD
Price last confirmed 8 days ago
A
Retailer 2
-
$332 USD
View
B+
Retailer 3
-
$455 USD
View
B+
Retailer 4
-
$465 USD
View
B+
Retailer 5
-
$546 USD
£430 GBP
View
B+
Retailer 6
-
$582 USD
View
Most Expensive
B
MOH London
LG455028355 · Nov 1
$1,171 USD
£922 GBP
View
6 more retailers have this diamond
Prices start from $332 USDSave up to $839 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.

A
1.21ct Round
$332 USD