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Radiant|Natural|GIA

1.20ct J SI1 Radiant Natural Diamond

EX • J/SI1 • GIA 1242026926

Certificate GIA 1242026926

Diamond specifications and retailer prices

From £1,367 GBP
As of November 6, 2026
Save £1,878 GBP (58%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £3,862 GBP at NZ Jewellers · As of September 30, 2026
View at NZ Jewellers

About this 1.2ct natural radiant diamond

This 1.2ct natural radiant 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 1242026926. Listed at 19 retailers as of November 4, 2026, with a 137% 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

1.20
Carat
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1242026926
Dimensions7.08 × 5.23 × 3.53 mm
L/W Ratio1.35
Girdle conditionPolished
Top View
7.08 mm5.23 mm1.20 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1242026926
Side View
Table 68.0%CrownGirdle: ThickPavilionCulet: NoneDepth 67.5%

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: £1,754 GBP|Low: £1,339 GBP|High: £3,301 GBP|Avg: £1,958 GBP|+0.7%
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 7, 2026
Retailer 3£1,367 GBP
Retailer 7£1,393 GBP
Retailer 12£1,498 GBP
Retailer 6£1,552 GBP
Retailer 11£1,603 GBP
Retailer 14£1,688 GBP
Retailer 15£1,703 GBP
Retailer 5£1,724 GBP
Retailer 1£1,754 GBP
Retailer 2£1,908 GBP
Retailer 9£2,267 GBP
Retailer 8£2,306 GBP
Retailer 4£2,585 GBP
Retailer 13£2,760 GBP
Retailer 10£3,245 GBP

31 data points across 15 retailers

19 retailers£1,367 GBP to £3,245 GBP

A
Cheapest Retailer
-
£1,367 GBP
A
Retailer 2
-
£1,393 GBP
View
A
Retailer 3
-
£1,498 GBP
View
B+
Retailer 4
-
£1,552 GBP
View
Final sale: no returns
B+
Retailer 5
-
£1,603 GBP
View
B+
Retailer 6
-
£1,688 GBP
View
B+
Retailer 7
-
£1,703 GBP
View
B+
Retailer 8
-
£1,724 GBP
View
B+
Retailer 9
-
£1,754 GBP
View
B+
Retailer 10
-
£1,844 GBP
View
Retailer 11
-
£1,855 GBP
View
Price last confirmed 37 days ago
B+
Retailer 12
-
£1,908 GBP
View
B
Retailer 13
-
£2,267 GBP
View
Retailer 14
-
£2,280 GBP
View
Price last confirmed 36 days ago
B
Retailer 15
-
£2,306 GBP
View
B
Retailer 16
-
£2,585 GBP
View
B
Retailer 17
-
£2,760 GBP
View
B
Retailer 18
-
£3,245 GBP
View
Most Expensive
NZ Jewellers
62ffbbde-18a4-4360-8d7e-35c1b4843a32 · Sep 30
£3,862 GBP
$5,169 USD
View
Price last confirmed 37 days ago
18 more retailers have this diamond
Prices start from £1,367 GBPSave up to £1,878 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
1.20ct Radiant
£1,367 GBP