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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 €297 EUR
$332 USD
As of November 1, 2026
Save €751 EUR (72%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: €1,048 EUR 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 €297 to €1,048, a €751 spread on the same certified stone. MOH London lists it at €1,048. 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: €1,048 EUR|Low: €237 EUR|High: €1,061 EUR|Avg: €488 EUR
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 2, 2026
Retailer 5€237 EUR
Retailer 7€297 EUR
Retailer 4€407 EUR
Retailer 3€416 EUR
Retailer 2€489 EUR
Retailer 6€521 EUR
MOH London€1,048 EUR

40 data points across 7 retailers

7 retailers€297 EUR to €1,048 EUR

Retailer 1
-
€237 EUR
$265 USD
Price last confirmed 7 days ago
A
Retailer 2
-
€297 EUR
$332 USD
View
B+
Retailer 3
-
€407 EUR
$455 USD
View
B+
Retailer 4
-
€416 EUR
$465 USD
View
B+
Retailer 5
-
€489 EUR
£430 GBP
View
B+
Retailer 6
-
€521 EUR
$582 USD
View
Most Expensive
B
MOH London
LG455028355 · Nov 1
€1,048 EUR
£922 GBP
View
6 more retailers have this diamond
Prices start from €297 EURSave up to €751 EUR

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
€297 EUR