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Heart|Natural|GIA

1.21ct K SI2 Heart Natural Diamond

EX • K/SI2 • GIA 2434019421

Certificate GIA 2434019421

Diamond specifications and retailer prices

From $2,329 AUD
As of November 6, 2026
Save $3,168 AUD (58%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $5,497 AUD at MOH London · As of November 4, 2026
View at MOH London

About this 1.21ct natural heart diamond

This 1.21ct natural heart sits in the classic one-carat band, graded K colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2434019421. Listed at 12 retailers as of November 4, 2026, with prices from $2,329 to $5,497, a $3,168 spread on the same certified stone. MOH London lists it at $5,497. 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
K
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2434019421
Dimensions6.20 × 5.86 × 4.10 mm
L/W Ratio1.06
Top View
6.20 mm5.86 mm1.21 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2434019421
Side View
Table 61.0%CrownGirdle: ThickPavilionCulet: NoneDepth 69.9%

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 6
Current: $5,497 AUD|Low: $2,310 AUD|High: $5,569 AUD|Avg: $3,339 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
Retailer 12
Retailer 13
November 6, 2026
Retailer 8$2,329 AUD
Retailer 10$2,783 AUD
Retailer 13$2,841 AUD
Retailer 5$2,950 AUD
Retailer 11$3,002 AUD
Retailer 9$3,145 AUD
Retailer 2$3,216 AUD
Retailer 3$3,304 AUD
Retailer 12$3,347 AUD
Retailer 7$3,417 AUD
Retailer 4$3,790 AUD
Retailer 6$3,905 AUD
MOH London$5,497 AUD

31 data points across 13 retailers

12 retailers$2,329 AUD to $5,497 AUD

A
Cheapest Retailer
-
$2,329 AUD
B+
Retailer 2
-
$2,783 AUD
View
B+
Retailer 3
-
$2,841 AUD
View
B+
Retailer 4
-
$3,002 AUD
View
Retailer 5
-
$3,145 AUD
View
Price last confirmed 9 days ago
B+
Retailer 6
-
$3,216 AUD
View
B+
Retailer 7
-
$3,247 AUD
View
B
Retailer 8
-
$3,304 AUD
View
B
Retailer 9
-
$3,347 AUD
View
B
Retailer 10
-
$3,417 AUD
View
B
Retailer 11
-
$3,905 AUD
View
Most Expensive
B
MOH London
AEE3F3158 · Nov 4
$5,497 AUD
£2,974 GBP
View
11 more retailers have this diamond
Prices start from $2,329 AUDSave up to $3,168 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 Heart
$2,329 AUD