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Round|Lab Grown|IGI

1.21ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • IGI LG425066489

Shape and cutting style on the report: Round brilliant

Certificate IGI LG425066489

Diamond specifications and retailer prices

From $871 AUD
As of November 5, 2026
Save $5,656 AUD (87%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $6,527 AUD at MOH London · As of November 3, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG425066489 or 425066489. Listed at 13 retailers as of November 3, 2026, with prices from $871 to $6,527, a $5,656 spread on the same certified stone. MOH London lists it at $6,527. 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.6°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG425066489
Dimensions6.96 × 6.98 × 4.13 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
6.96 mm6.98 mm1.21 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG425066489
Side View
Table 58.5%Crown 31.6°GirdlePavilion 40.9°Culet: NoneDepth 59.3%

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: $6,527 AUD|Low: $871 AUD|High: $6,615 AUD|Avg: $2,998 AUD|-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 6, 2026
Retailer 6$871 AUD
Retailer 5$1,970 AUD
Retailer 11$2,144 AUD
Retailer 10$2,207 AUD
Retailer 7$2,286 AUD
Retailer 9$2,286 AUD
Retailer 2$2,974 AUD
Retailer 8$3,608 AUD
Retailer 4$3,873 AUD
Retailer 3$4,284 AUD
MOH London$6,527 AUD

46 data points across 11 retailers

13 retailers$871 AUD to $6,527 AUD

A
Cheapest Retailer
-
$871 AUD
B+
Retailer 2
-
$1,970 AUD
View
B+
Retailer 3
-
$2,144 AUD
View
B+
Retailer 4
-
$2,207 AUD
View
Final sale: no returns
B+
Retailer 5
-
$2,286 AUD
View
Retailer 6
-
$2,286 AUD
View
Price last confirmed 25 days ago
B
Retailer 7
-
$2,528 AUD
View
B+
Retailer 8
-
$2,974 AUD
View
B
Retailer 9
-
$3,608 AUD
View
B
Retailer 10
-
$3,873 AUD
View
B
Retailer 11
-
$4,148 AUD
View
B
Retailer 12
-
$4,284 AUD
View
Most Expensive
B
MOH London
LG425066489 · Nov 3
$6,527 AUD
£3,598 GBP
View
12 more retailers have this diamond
Prices start from $871 AUDSave up to $5,656 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.

A
1.21ct Round
$871 AUD