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Radiant|Natural|GIA

1.20ct J SI1 Radiant Natural Diamond

EX • J/SI1 • GIA 1515243600

Certificate GIA 1515243600

Diamond specifications and retailer prices

From £1,658 GBP
As of November 5, 2026
Save £2,741 GBP (62%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £4,399 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 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 1515243600. Listed at 22 retailers as of November 3, 2026, with prices from £1,658 to £4,399, a £2,741 spread on the same certified stone. NZ Jewellers lists it at £4,399. 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 1515243600
Dimensions7.14 × 5.33 × 3.65 mm
L/W Ratio1.34
Girdle conditionPolished
Culet sizeNone
Key to symbols
Crystal, Needle, Natural
Top View
7.14 mm5.33 mm1.20 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1515243600
Side View
Table 68.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 68.3%

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 5
Current: £1,901 GBP|Low: £1,658 GBP|High: £3,726 GBP|Avg: £2,276 GBP
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 11£1,658 GBP
Retailer 12£1,678 GBP
Retailer 6£1,722 GBP
Retailer 4£1,745 GBP
Retailer 13£1,770 GBP
Retailer 1£1,901 GBP
Retailer 14£1,972 GBP
Retailer 15£2,081 GBP
Retailer 2£2,097 GBP
Retailer 10£2,143 GBP
Retailer 3£2,317 GBP
Retailer 7£2,357 GBP
Retailer 8£2,367 GBP
Retailer 9£2,472 GBP
Retailer 5£3,685 GBP

33 data points across 15 retailers

22 retailers£1,658 GBP to £4,399 GBP

B+
Cheapest Retailer
-
£1,658 GBP
B+
Retailer 2
-
£1,678 GBP
View
Final sale: no returns
B+
Retailer 3
-
£1,722 GBP
View
B+
Retailer 4
-
£1,745 GBP
View
B+
Retailer 5
-
£1,759 GBP
View
B+
Retailer 6
-
£1,770 GBP
View
B
Retailer 7
-
£1,901 GBP
View
Retailer 8
-
£1,907 GBP
View
Price last confirmed 9 days ago
B
Retailer 9
-
£1,907 GBP
View
B+
Retailer 10
-
£1,972 GBP
View
B+
Retailer 11
-
£2,034 GBP
View
B+
Retailer 12
-
£2,081 GBP
View
B+
Retailer 13
-
£2,097 GBP
View
B
Retailer 14
-
£2,130 GBP
View
B+
Retailer 15
-
£2,143 GBP
View
B
Retailer 16
-
£2,241 GBP
View
B
Retailer 17
-
£2,317 GBP
View
Retailer 18
-
£2,357 GBP
View
Price last confirmed 31 days ago
B
Retailer 19
-
£2,367 GBP
View
B
Retailer 20
-
£2,472 GBP
View
B
Retailer 21
-
£3,685 GBP
View
Most Expensive
B
NZ Jewellers
76458eb6-69a0-4a20-85c4-dab2693a0be1 · Nov 3
£4,399 GBP
$5,888 USD
View
21 more retailers have this diamond
Prices start from £1,658 GBPSave up to £2,741 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+
1.20ct Radiant
£1,658 GBP