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Heart|Natural|GIA

1.21ct D SI1 Heart Natural Diamond

EX • D/SI1 • GIA 6442853900

Certificate GIA 6442853900

Diamond specifications and retailer prices

From $3,855 AUD
As of November 6, 2026
Save $4,383 AUD (53%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $8,238 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6442853900. Listed at 20 retailers as of November 4, 2026, with prices from $3,855 to $8,238, a $4,383 spread on the same certified stone. MOH London lists it at $8,238. 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
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle44.6°
Pavilion angle53.43°
OriginNatural
Grading LabGIA
CertificateGIA 6442853900
Dimensions5.94 × 5.77 × 4.03 mm
L/W Ratio1.03
Top View
5.94 mm5.77 mm1.21 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6442853900
Side View
Table 65.0%Crown 44.6°Girdle: MED-VTKPavilion 53.43°Culet: NoneDepth 69.8%

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 6
Current: $8,238 AUD|Low: $3,855 AUD|High: $8,305 AUD|Avg: $5,313 AUD|-0.8%
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 2$3,855 AUD
Retailer 10$3,874 AUD
Retailer 8$4,422 AUD
Retailer 11$4,785 AUD
Retailer 4$4,791 AUD
Retailer 9$5,114 AUD
Retailer 6$5,381 AUD
Retailer 3$5,692 AUD
Retailer 5$5,750 AUD
Retailer 7$6,028 AUD
MOH London$8,238 AUD

26 data points across 11 retailers

20 retailers$3,855 AUD to $8,238 AUD

A
Cheapest Retailer
-
$3,855 AUD
A
Retailer 2
-
$3,874 AUD
View
B+
Retailer 3
-
$4,385 AUD
View
B+
Retailer 4
-
$4,422 AUD
View
B+
Retailer 5
-
$4,558 AUD
View
Final sale: no returns
B+
Retailer 6
-
$4,766 AUD
View
B+
Retailer 7
-
$4,785 AUD
View
B+
Retailer 8
-
$4,791 AUD
View
Retailer 9
-
$4,940 AUD
View
Price last confirmed 9 days ago
B+
Retailer 10
-
$4,963 AUD
View
B+
Retailer 11
-
$5,114 AUD
View
B+
Retailer 12
-
$5,149 AUD
View
B+
Retailer 13
-
$5,242 AUD
View
Retailer 14
-
$5,276 AUD
View
Price last confirmed 31 days ago
B+
Retailer 15
-
$5,381 AUD
View
B+
Retailer 16
-
$5,750 AUD
View
B
Retailer 17
-
$6,028 AUD
View
B
Retailer 18
-
$7,281 AUD
View
B
Retailer 19
-
$7,484 AUD
View
Most Expensive
B
MOH London
52F0D1674 · Nov 4
$8,238 AUD
£4,457 GBP
View
19 more retailers have this diamond
Prices start from $3,855 AUDSave up to $4,383 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
$3,855 AUD