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Round|Lab Grown|IGI

1.21ct H SI1 Round Lab Grown Diamond

ID • H/SI1 • IGI LG817652948

Shape and cutting style on the report: Round brilliant

Certificate IGI LG817652948

Diamond specifications and retailer prices

From $326 AUD
As of November 4, 2026
Save $446 AUD (58%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $1,487 AUD at Reve Diamonds · As of October 25, 2026
View at Reve Diamonds

About this 1.21ct lab-grown round diamond

This 1.21ct lab-grown round sits in the classic one-carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG817652948 or 817652948. Listed at 16 retailers as of November 4, 2026, with a 137% 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
H
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle34.9°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG817652948
Dimensions6.86 × 6.82 × 4.14 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.86 mm6.82 mm1.21 ctH / SI1
OriginLab Grown
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG817652948
Side View
Table 60.0%Crown 34.9°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 60.5%

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 4
Current: $423 AUD|Low: $216 AUD|High: $2,034 AUD|Avg: $779 AUD|-22.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Reve Diamonds
November 6, 2026
Retailer 10$216 AUD
Retailer 9$326 AUD
Retailer 4$373 AUD
Retailer 1$423 AUD
Retailer 7$551 AUD
Retailer 6$567 AUD
Retailer 5$586 AUD
Retailer 2$736 AUD
Retailer 8$771 AUD
Retailer 11$854 AUD
Retailer 3$1,267 AUD
Reve Diamonds$1,487 AUD

34 data points across 12 retailers

16 retailers$326 AUD to $771 AUD

Retailer 1
-
$261 AUD
Price last confirmed 27 days ago
Retailer 2
-
$304 AUD
View
Price last confirmed 28 days ago
Retailer 3
-
$324 AUD
View
Price last confirmed 27 days ago
B+
Retailer 4
-
$326 AUD
View
A
Retailer 5
-
$373 AUD
View
A
Retailer 6
-
$423 AUD
View
A
Retailer 7
-
$551 AUD
View
A
Retailer 8
-
$567 AUD
View
A
Retailer 9
-
$586 AUD
View
Retailer 10
-
$643 AUD
View
Price last confirmed 11 days ago
Retailer 11
-
$736 AUD
View
Price last confirmed 11 days ago
A
Retailer 12
-
$771 AUD
View
Retailer 13
-
$854 AUD
View
Price last confirmed 10 days ago
Retailer 14
-
$1,044 AUD
View
Price last confirmed 28 days ago
Retailer 15
-
$1,267 AUD
View
Price last confirmed 16 days ago
Most Expensive
Reve Diamonds
CA45F42F7 · Oct 25
$1,487 AUD
$1,041 USD
View
Price last confirmed 12 days ago
15 more retailers have this diamond
Prices start from $326 AUDSave up to $446 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
$326 AUD