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Heart|Natural|GIA

1.21ct K SI2 Heart Natural Diamond

EX • K/SI2 • GIA 2434019421

Certificate GIA 2434019421

Diamond specifications and retailer prices

From £1,195 GBP
As of November 6, 2026
Save £1,626 GBP (58%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £2,822 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 K colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2434019421. Listed at 12 retailers as of November 4, 2026, with prices from £1,195 to £2,822, a £1,626 spread on the same certified stone. MOH London lists it at £2,822. 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
K
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2434019421
Dimensions6.20 × 5.86 × 4.10 mm
L/W Ratio1.06
Top View
6.20 mm5.86 mm1.21 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2434019421
Side View
Table 61.0%CrownGirdle: ThickPavilionCulet: NoneDepth 69.9%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: £2,822 GBP|Low: £1,186 GBP|High: £2,859 GBP|Avg: £1,714 GBP|-1.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 6, 2026
Retailer 8£1,195 GBP
Retailer 10£1,428 GBP
Retailer 13£1,458 GBP
Retailer 5£1,514 GBP
Retailer 11£1,541 GBP
Retailer 9£1,615 GBP
Retailer 2£1,651 GBP
Retailer 3£1,696 GBP
Retailer 12£1,718 GBP
Retailer 7£1,754 GBP
Retailer 4£1,945 GBP
Retailer 6£2,004 GBP
MOH London£2,822 GBP

31 data points across 13 retailers

12 retailers£1,195 GBP to £2,822 GBP

A
Cheapest Retailer
-
£1,195 GBP
B+
Retailer 2
-
£1,428 GBP
View
B+
Retailer 3
-
£1,458 GBP
View
B+
Retailer 4
-
£1,541 GBP
View
Retailer 5
-
£1,615 GBP
View
Price last confirmed 8 days ago
B+
Retailer 6
-
£1,651 GBP
View
B+
Retailer 7
-
£1,667 GBP
View
B
Retailer 8
-
£1,696 GBP
View
B
Retailer 9
-
£1,718 GBP
View
B
Retailer 10
-
£1,754 GBP
View
B
Retailer 11
-
£2,004 GBP
View
Most Expensive
B
MOH London
AEE3F3158 · Nov 4
£2,822 GBP
View
11 more retailers have this diamond
Prices start from £1,195 GBPSave up to £1,626 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
£1,195 GBP