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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 £1,979 GBP
As of November 6, 2026
Save £2,250 GBP (53%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £4,229 GBP 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 £1,979 to £4,229, a £2,250 spread on the same certified stone. MOH London lists it at £4,229. 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: £4,229 GBP|Low: £1,979 GBP|High: £4,263 GBP|Avg: £2,727 GBP|-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£1,979 GBP
Retailer 10£1,989 GBP
Retailer 8£2,270 GBP
Retailer 11£2,456 GBP
Retailer 4£2,459 GBP
Retailer 9£2,625 GBP
Retailer 6£2,762 GBP
Retailer 3£2,922 GBP
Retailer 5£2,952 GBP
Retailer 7£3,095 GBP
MOH London£4,229 GBP

26 data points across 11 retailers

20 retailers£1,979 GBP to £4,229 GBP

A
Cheapest Retailer
-
£1,979 GBP
A
Retailer 2
-
£1,989 GBP
View
B+
Retailer 3
-
£2,251 GBP
View
B+
Retailer 4
-
£2,270 GBP
View
B+
Retailer 5
-
£2,340 GBP
View
Final sale: no returns
B+
Retailer 6
-
£2,447 GBP
View
B+
Retailer 7
-
£2,456 GBP
View
B+
Retailer 8
-
£2,459 GBP
View
Retailer 9
-
£2,536 GBP
View
Price last confirmed 8 days ago
B+
Retailer 10
-
£2,548 GBP
View
B+
Retailer 11
-
£2,625 GBP
View
B+
Retailer 12
-
£2,643 GBP
View
B+
Retailer 13
-
£2,691 GBP
View
Retailer 14
-
£2,708 GBP
View
Price last confirmed 30 days ago
B+
Retailer 15
-
£2,762 GBP
View
B+
Retailer 16
-
£2,952 GBP
View
B
Retailer 17
-
£3,095 GBP
View
B
Retailer 18
-
£3,738 GBP
View
B
Retailer 19
-
£3,842 GBP
View
Most Expensive
B
MOH London
52F0D1674 · Nov 4
£4,229 GBP
View
19 more retailers have this diamond
Prices start from £1,979 GBPSave up to £2,250 GBP

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
£1,979 GBP