CaratHunter
Plans
Heart|Natural|GIA

1.21ct I SI1 Heart Natural Diamond

EX • I/SI1 • GIA 5241078543

Certificate GIA 5241078543

Diamond specifications and retailer prices

From £1,415 GBP
As of November 6, 2026
Save £1,865 GBP (57%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £3,946 GBP at NZ Jewellers · As of October 18, 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 5241078543. Listed at 16 retailers as of November 4, 2026, with a 132% 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
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 5241078543
Dimensions6.53 × 7.44 × 4.31 mm
L/W Ratio1.14
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Needle
Top View
6.53 mm7.44 mm1.21 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 5241078543
Side View
Table 59.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 57.9%

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: £1,821 GBP|Low: £1,405 GBP|High: £3,346 GBP|Avg: £1,999 GBP|-2.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 11£1,415 GBP
Retailer 7£1,654 GBP
Retailer 10£1,732 GBP
Retailer 3£1,759 GBP
Retailer 1£1,821 GBP
Retailer 4£1,961 GBP
Retailer 9£1,981 GBP
Retailer 5£1,986 GBP
Retailer 2£2,114 GBP
Retailer 6£2,291 GBP
Retailer 8£3,280 GBP

43 data points across 11 retailers

16 retailers£1,415 GBP to £3,280 GBP

A
Cheapest Retailer
-
£1,415 GBP
B+
Retailer 2
-
£1,654 GBP
View
B+
Retailer 3
-
£1,732 GBP
View
Final sale: no returns
B+
Retailer 4
-
£1,759 GBP
View
B+
Retailer 5
-
£1,821 GBP
View
Retailer 6
-
£1,888 GBP
View
Price last confirmed 20 days ago
Retailer 7
-
£1,888 GBP
View
Price last confirmed 22 days ago
B+
Retailer 8
-
£1,961 GBP
View
Retailer 9
-
£1,975 GBP
View
Price last confirmed 22 days ago
B+
Retailer 10
-
£1,981 GBP
View
B+
Retailer 11
-
£1,986 GBP
View
Retailer 12
-
£2,114 GBP
View
Price last confirmed 31 days ago
Retailer 13
-
£2,178 GBP
View
Price last confirmed 19 days ago
B+
Retailer 14
-
£2,291 GBP
View
B
Retailer 15
-
£3,280 GBP
View
Most Expensive
NZ Jewellers
b8ff14db-c968-4b36-b67a-db21493df5da · Oct 18
£3,946 GBP
$5,282 USD
View
Price last confirmed 20 days ago
15 more retailers have this diamond
Prices start from £1,415 GBPSave up to £1,865 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
£1,415 GBP