CaratHunter
Plans
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 $591 NZD
As of November 5, 2026
Save $1,486 NZD (72%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $2,076 NZD at MOH London · As of November 5, 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 5, 2026, with prices from $591 to $2,076, a $1,486 spread on the same certified stone. MOH London lists it at $2,076. 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
Colour
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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $2,076 NZD|Low: $471 NZD|High: $2,108 NZD|Avg: $974 NZD|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 5$471 NZD
Retailer 7$591 NZD
Retailer 3$747 NZD
Retailer 4$809 NZD
Retailer 2$970 NZD
Retailer 6$1,035 NZD
MOH London$2,076 NZD

42 data points across 7 retailers

7 retailers$591 NZD to $2,076 NZD

Retailer 1
-
$471 NZD
Price last confirmed 12 days ago
A
Retailer 2
-
$591 NZD
View
B+
Retailer 3
-
$747 NZD
View
B+
Retailer 4
-
$809 NZD
View
B+
Retailer 5
-
$970 NZD
View
B+
Retailer 6
-
$1,035 NZD
View
Most Expensive
B
MOH London
LG455028355 · Nov 5
$2,076 NZD
£919 GBP
View
6 more retailers have this diamond
Prices start from $591 NZDSave up to $1,486 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
1.21ct Round
$591 NZD