Heart|Natural|GIA

1.21ct D SI1 Heart Natural Diamond

EX • D/SI1 • GIA 6442853900

Certificate GIA 6442853900

Diamond specifications and retailer prices

From $2,649 USD
As of November 6, 2026
Save $3,011 USD (53%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $5,660 USD 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 $2,649 to $5,660, a $3,011 spread on the same certified stone. MOH London lists it at $5,660. 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
Color
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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $5,660 USD|Low: $2,649 USD|High: $5,706 USD|Avg: $3,650 USD|-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$2,649 USD
Retailer 10$2,662 USD
Retailer 8$3,038 USD
Retailer 11$3,288 USD
Retailer 4$3,292 USD
Retailer 9$3,514 USD
Retailer 6$3,697 USD
Retailer 3$3,911 USD
Retailer 5$3,951 USD
Retailer 7$4,142 USD
MOH London$5,660 USD

26 data points across 11 retailers

20 retailers$2,649 USD to $5,660 USD

A
Cheapest Retailer
-
$2,649 USD
A
Retailer 2
-
$2,662 USD
View
B+
Retailer 3
-
$3,013 USD
View
B+
Retailer 4
-
$3,038 USD
View
B+
Retailer 5
-
$3,132 USD
View
Final sale: no returns
B+
Retailer 6
-
$3,275 USD
View
B+
Retailer 7
-
$3,288 USD
View
B+
Retailer 8
-
$3,292 USD
View
Retailer 9
-
$3,394 USD
View
Price last confirmed 8 days ago
B+
Retailer 10
-
$3,410 USD
View
B+
Retailer 11
-
$3,514 USD
View
B+
Retailer 12
-
$3,538 USD
View
B+
Retailer 13
-
$3,602 USD
View
Retailer 14
-
$3,625 USD
View
Price last confirmed 30 days ago
B+
Retailer 15
-
$3,697 USD
View
B+
Retailer 16
-
$3,951 USD
View
B
Retailer 17
-
$4,142 USD
View
B
Retailer 18
-
$5,003 USD
View
B
Retailer 19
-
$5,142 USD
View
Most Expensive
B
MOH London
52F0D1674 · Nov 4
$5,660 USD
£4,457 GBP
View
19 more retailers have this diamond
Prices start from $2,649 USDSave up to $3,011 USD

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
$2,649 USD