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Heart|Natural|GIA

1.21ct J SI1 Heart Natural Diamond

EX • J/SI1 • GIA 2508189179

Certificate GIA 2508189179

Diamond specifications and retailer prices

From £1,491 GBP
As of November 6, 2026
Save £2,689 GBP (64%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £4,180 GBP at NZ Jewellers · As of November 5, 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 J 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 2508189179. Listed at 20 retailers as of November 5, 2026, with prices from £1,491 to £4,180, a £2,689 spread on the same certified stone. NZ Jewellers lists it at £4,180. 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
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2508189179
Dimensions6.69 × 7.23 × 4.20 mm
L/W Ratio1.08
Top View
6.69 mm7.23 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateGIA 2508189179
Side View
Table 56.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 58.1%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £4,180 GBP|Low: £1,473 GBP|High: £4,180 GBP|Avg: £2,274 GBP
NZ Jewellers
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
Retailer 16
Retailer 17
Retailer 18
November 6, 2026
Retailer 15£1,491 GBP
Retailer 16£1,765 GBP
Retailer 5£1,791 GBP
Retailer 17£1,845 GBP
Retailer 3£1,969 GBP
Retailer 6£1,973 GBP
Retailer 7£1,999 GBP
Retailer 11£2,070 GBP
Retailer 4£2,076 GBP
Retailer 10£2,105 GBP
Retailer 12£2,116 GBP
Retailer 8£2,209 GBP
Retailer 18£2,240 GBP
Retailer 9£2,289 GBP
Retailer 13£2,440 GBP
Retailer 2£2,483 GBP
Retailer 14£3,493 GBP
NZ Jewellers£4,180 GBP

43 data points across 18 retailers

20 retailers£1,491 GBP to £4,180 GBP

B+
Cheapest Retailer
-
£1,491 GBP
B+
Retailer 2
-
£1,765 GBP
View
B+
Retailer 3
-
£1,791 GBP
View
B
Retailer 4
-
£1,845 GBP
View
Final sale: no returns
B+
Retailer 5
-
£1,937 GBP
View
B+
Retailer 6
-
£1,969 GBP
View
Retailer 7
-
£1,999 GBP
View
Price last confirmed 9 days ago
B+
Retailer 8
-
£1,999 GBP
View
B
Retailer 9
-
£2,070 GBP
View
B
Retailer 10
-
£2,076 GBP
View
B
Retailer 11
-
£2,105 GBP
View
B+
Retailer 12
-
£2,116 GBP
View
B
Retailer 13
-
£2,209 GBP
View
Retailer 14
-
£2,240 GBP
View
Price last confirmed 31 days ago
B
Retailer 15
-
£2,289 GBP
View
B
Retailer 16
-
£2,307 GBP
View
B
Retailer 17
-
£2,440 GBP
View
B
Retailer 18
-
£2,483 GBP
View
B
Retailer 19
-
£3,493 GBP
View
Most Expensive
B
NZ Jewellers
f3b42846-f509-4876-a79d-a14152981848 · Nov 5
£4,180 GBP
$5,595 USD
View
19 more retailers have this diamond
Prices start from £1,491 GBPSave up to £2,689 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.

B+
1.21ct Heart
£1,491 GBP