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Radiant|Natural|GIA

1.20ct F SI1 Radiant Natural Diamond

ID • F/SI1 • GIA 5231729279

Certificate GIA 5231729279

Diamond specifications and retailer prices

From £2,186 GBP
As of November 7, 2026
Save £1,899 GBP (46%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £4,085 GBP at NZ Jewellers · As of November 3, 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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 5231729279. Listed at 10 retailers as of November 3, 2026, with prices from £2,186 to £4,085, a £1,899 spread on the same certified stone. NZ Jewellers lists it at £4,085. 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
F
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceMedium
Crown angle44.82°
Pavilion angle31°
OriginNatural
Grading LabGIA
CertificateGIA 5231729279
Dimensions6.81 × 5.25 × 3.60 mm
L/W Ratio1.30
Girdle conditionVery Thick
Key to symbols
Crystal, Needle
Top View
6.81 mm5.25 mm1.20 ctF / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 5231729279
Side View
Table 65.0%Crown 44.82°Girdle: ThickPavilion 31°Culet: NoneDepth 68.6%

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 7
Current: £4,085 GBP|Low: £2,186 GBP|High: £4,085 GBP|Avg: £2,839 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
November 7, 2026
Retailer 7£2,186 GBP
Retailer 8£2,287 GBP
Retailer 10£2,345 GBP
Retailer 5£2,346 GBP
Retailer 6£2,435 GBP
Retailer 11£2,456 GBP
Retailer 12£2,505 GBP
Retailer 9£2,639 GBP
Retailer 3£2,816 GBP
Retailer 4£2,839 GBP
Retailer 2£3,900 GBP
NZ Jewellers£4,085 GBP

38 data points across 12 retailers

10 retailers£2,186 GBP to £4,085 GBP

A
Cheapest Retailer
-
£2,186 GBP
B+
Retailer 2
-
£2,287 GBP
View
B+
Retailer 3
-
£2,345 GBP
View
B+
Retailer 4
-
£2,346 GBP
View
B+
Retailer 5
-
£2,435 GBP
View
B+
Retailer 6
-
£2,456 GBP
View
Retailer 7
-
£2,505 GBP
View
Price last confirmed 31 days ago
B+
Retailer 8
-
£2,639 GBP
View
B
Retailer 9
-
£3,900 GBP
View
Most Expensive
B
NZ Jewellers
e9b2c886-2d9c-4bb4-ae68-4ede3844fe8c · Nov 3
£4,085 GBP
$5,468 USD
View
9 more retailers have this diamond
Prices start from £2,186 GBPSave up to £1,899 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
£2,186 GBP