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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 $4,779 NZD
As of November 6, 2026
Save $5,432 NZD (53%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $10,211 NZD 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 $4,779 to $10,211, a $5,432 spread on the same certified stone. MOH London lists it at $10,211. 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: $10,211 NZD|Low: $4,779 NZD|High: $10,293 NZD|Avg: $6,585 NZD|-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$4,779 NZD
Retailer 10$4,802 NZD
Retailer 8$5,480 NZD
Retailer 11$5,931 NZD
Retailer 4$5,938 NZD
Retailer 9$6,339 NZD
Retailer 6$6,669 NZD
Retailer 3$7,055 NZD
Retailer 5$7,127 NZD
Retailer 7$7,472 NZD
MOH London$10,211 NZD

26 data points across 11 retailers

20 retailers$4,779 NZD to $10,211 NZD

A
Cheapest Retailer
-
$4,779 NZD
A
Retailer 2
-
$4,802 NZD
View
B+
Retailer 3
-
$5,435 NZD
View
B+
Retailer 4
-
$5,480 NZD
View
B+
Retailer 5
-
$5,650 NZD
View
Final sale: no returns
B+
Retailer 6
-
$5,908 NZD
View
B+
Retailer 7
-
$5,931 NZD
View
B+
Retailer 8
-
$5,938 NZD
View
Retailer 9
-
$6,122 NZD
View
Price last confirmed 8 days ago
B+
Retailer 10
-
$6,151 NZD
View
B+
Retailer 11
-
$6,339 NZD
View
B+
Retailer 12
-
$6,382 NZD
View
B+
Retailer 13
-
$6,498 NZD
View
Retailer 14
-
$6,539 NZD
View
Price last confirmed 30 days ago
B+
Retailer 15
-
$6,669 NZD
View
B+
Retailer 16
-
$7,127 NZD
View
B
Retailer 17
-
$7,472 NZD
View
B
Retailer 18
-
$9,025 NZD
View
B
Retailer 19
-
$9,276 NZD
View
Most Expensive
B
MOH London
52F0D1674 · Nov 4
$10,211 NZD
£4,457 GBP
View
19 more retailers have this diamond
Prices start from $4,779 NZDSave up to $5,432 NZD

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
$4,779 NZD