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Round|Lab Grown|IGI

1.21ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG813619766

Shape and cutting style on the report: Round brilliant

Certificate IGI LG813619766

Diamond specifications and retailer prices

From $639 AUD
As of November 6, 2026
Save $190 AUD (23%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: $1,192 AUD at MOH London · As of October 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG813619766 or 813619766. Listed at 4 retailers as of November 5, 2026, with a 30% 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

1.21
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle41.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG813619766
Dimensions6.87 × 6.80 × 4.24 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.87 mm6.80 mm1.21 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG813619766
Side View
Table 59.0%Crown 35.4°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 62.0%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 6
Current: $1,192 AUD|Low: $404 AUD|High: $1,192 AUD|Avg: $667 AUD|+1.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 3, 2026
Retailer 6$411 AUD
Retailer 4$431 AUD
Retailer 5$469 AUD
Retailer 10$520 AUD
Retailer 8$587 AUD
Retailer 2$639 AUD
Retailer 3$664 AUD
Retailer 7$720 AUD
Retailer 9$829 AUD
Retailer 11$889 AUD
MOH London$1,192 AUD

11 data points across 11 retailers

4 retailers$639 AUD to $829 AUD

B+
Cheapest Retailer
-
$639 AUD
Retailer 2
-
$664 AUD
View
Price last confirmed 102 days ago
B+
Retailer 3
-
$829 AUD
View
Most Expensive
MOH London
LG813619766 · Oct 1
$1,192 AUD
£657 GBP
View
Price last confirmed 36 days ago
3 more retailers have this diamond
Prices start from $639 AUDSave up to $190 AUD

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+
1.21ct Round
$639 AUD