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Round|Natural|GIA

1.20ct J SI2 Round Natural Diamond

EX • J/SI2 • GIA 6542820378

Certificate GIA 6542820378

Diamond specifications and retailer prices

From £1,600 GBP
As of November 6, 2026
Save £2,851 GBP (64%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £4,451 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.2ct natural round diamond

This 1.2ct natural round sits in the classic one-carat band, graded J colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6542820378. Listed at 17 retailers as of November 5, 2026, with prices from £1,600 to £4,451, a £2,851 spread on the same certified stone. NZ Jewellers lists it at £4,451. 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 6542820378
Dimensions6.78 × 6.76 × 4.24 mm
L/W Ratio1.00
Top View
6.78 mm6.76 mm1.20 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6542820378
Side View
Table 58.0%Crown 34.5°Girdle: MED-STKPavilion 41.6°Culet: NoneDepth 62.7%

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: £4,451 GBP|Low: £1,600 GBP|High: £4,451 GBP|Avg: £2,397 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
November 6, 2026
Retailer 9£1,600 GBP
Retailer 3£1,672 GBP
Retailer 13£1,779 GBP
Retailer 4£1,929 GBP
Retailer 6£1,929 GBP
Retailer 15£2,018 GBP
Retailer 14£2,092 GBP
Retailer 5£2,225 GBP
Retailer 2£2,240 GBP
Retailer 12£2,488 GBP
Retailer 8£2,505 GBP
Retailer 7£2,533 GBP
Retailer 11£3,067 GBP
Retailer 10£3,560 GBP
NZ Jewellers£4,451 GBP

39 data points across 15 retailers

17 retailers£1,600 GBP to £4,451 GBP

A
Cheapest Retailer
-
£1,600 GBP
B+
Retailer 2
-
£1,672 GBP
View
B+
Retailer 3
-
£1,727 GBP
View
B+
Retailer 4
-
£1,779 GBP
View
Final sale: no returns
B+
Retailer 5
-
£1,929 GBP
View
Retailer 6
-
£1,929 GBP
View
Price last confirmed 8 days ago
B+
Retailer 7
-
£2,018 GBP
View
B
Retailer 8
-
£2,092 GBP
View
B+
Retailer 9
-
£2,207 GBP
View
B+
Retailer 10
-
£2,207 GBP
View
B+
Retailer 11
-
£2,225 GBP
View
B+
Retailer 12
-
£2,240 GBP
View
B
Retailer 13
-
£2,281 GBP
View
B
Retailer 14
-
£2,505 GBP
View
B
Retailer 15
-
£3,067 GBP
View
B
Retailer 16
-
£3,560 GBP
View
Most Expensive
B
NZ Jewellers
3e49ae64-05b7-42ad-913f-fde23ded4821 · Nov 5
£4,451 GBP
$5,990 USD
View
16 more retailers have this diamond
Prices start from £1,600 GBPSave up to £2,851 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 Round
£1,600 GBP