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Heart|Natural|GIA

1.21ct I SI1 Heart Natural Diamond

EX • I/SI1 • GIA 6552329003

Certificate GIA 6552329003

Diamond specifications and retailer prices

From £1,310 GBP
As of November 6, 2026
Save £1,718 GBP (57%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £3,922 GBP at NZ Jewellers · As of September 25, 2026
View at NZ Jewellers

About this 1.21ct natural heart diamond

This 1.21ct natural heart sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6552329003. Listed at 17 retailers as of November 4, 2026, with a 131% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6552329003
Dimensions6.29 × 7.39 × 4.32 mm
L/W Ratio1.17
Girdle conditionFaceted
Top View
6.29 mm7.39 mm1.21 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6552329003
Side View
Table 59.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 58.5%

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: £1,526 GBP|Low: £1,291 GBP|High: £3,240 GBP|Avg: £1,841 GBP|-5.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
November 6, 2026
Retailer 3£1,310 GBP
Retailer 5£1,389 GBP
Retailer 13£1,433 GBP
Retailer 4£1,449 GBP
Retailer 1£1,526 GBP
Retailer 11£1,538 GBP
Retailer 6£1,573 GBP
Retailer 12£1,588 GBP
Retailer 15£1,614 GBP
Retailer 8£1,706 GBP
Retailer 2£1,780 GBP
Retailer 9£2,115 GBP
Retailer 7£2,256 GBP
Retailer 14£2,657 GBP
Retailer 10£3,027 GBP

28 data points across 15 retailers

17 retailers£1,310 GBP to £3,027 GBP

A
Cheapest Retailer
-
£1,310 GBP
A
Retailer 2
-
£1,389 GBP
View
A
Retailer 3
-
£1,433 GBP
View
A
Retailer 4
-
£1,449 GBP
View
Final sale: no returns
A
Retailer 5
-
£1,526 GBP
View
A
Retailer 6
-
£1,538 GBP
View
A
Retailer 7
-
£1,573 GBP
View
B+
Retailer 8
-
£1,588 GBP
View
A
Retailer 9
-
£1,614 GBP
View
B+
Retailer 10
-
£1,706 GBP
View
B+
Retailer 11
-
£1,780 GBP
View
B+
Retailer 12
-
£1,970 GBP
View
B+
Retailer 13
-
£2,115 GBP
View
Retailer 14
-
£2,256 GBP
View
Price last confirmed 31 days ago
B
Retailer 15
-
£2,657 GBP
View
B
Retailer 16
-
£3,027 GBP
View
Most Expensive
NZ Jewellers
af40f1d1-938f-4390-8250-a7638881247b · Sep 25
£3,922 GBP
$5,250 USD
View
Price last confirmed 42 days ago
16 more retailers have this diamond
Prices start from £1,310 GBPSave up to £1,718 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
£1,310 GBP