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Heart|Natural|GIA

1.21ct K SI1 Heart Natural Diamond

GD • K/SI1 • GIA 1146870344

Certificate GIA 1146870344

Diamond specifications and retailer prices

From $2,497 AUD
As of November 5, 2026
Save $2,789 AUD (53%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $5,286 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 SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 1146870344. Listed at 7 retailers as of November 4, 2026, with prices from $2,497 to $5,286, a $2,789 spread on the same certified stone. MOH London lists it at $5,286. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.21
Carat
K
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishVery Good
SymmetryGood
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 1146870344
Dimensions6.05 × 8.74 × 4.04 mm
L/W Ratio1.44
Top View
6.05 mm8.74 mm1.21 ctK / SI1
OriginNatural
CutGood
PolishVery Good
SymmetryGood
FluorescenceMedium
CertificateGIA 1146870344
Side View
Table 67.0%CrownGirdle: UND-VTKPavilionCulet: NoneDepth 46.2%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $5,286 AUD|Low: $2,497 AUD|High: $5,366 AUD|Avg: $3,490 AUD|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 4$2,497 AUD
Retailer 3$2,741 AUD
Retailer 6$2,746 AUD
Retailer 5$2,978 AUD
Retailer 2$3,286 AUD
Retailer 8$3,925 AUD
Retailer 7$4,276 AUD
MOH London$5,286 AUD

37 data points across 8 retailers

7 retailers$2,497 AUD to $5,286 AUD

B+
Cheapest Retailer
-
$2,497 AUD
Retailer 2
-
$2,741 AUD
View
Price last confirmed 8 days ago
B+
Retailer 3
-
$2,746 AUD
View
B
Retailer 4
-
$2,978 AUD
View
B
Retailer 5
-
$3,286 AUD
View
C
Retailer 6
-
$4,276 AUD
View
Most Expensive
C
MOH London
A268D12B1 · Nov 4
$5,286 AUD
£2,860 GBP
View
6 more retailers have this diamond
Prices start from $2,497 AUDSave up to $2,789 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 Heart
$2,497 AUD