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Round|Natural|GIA

1.20ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 5556715240

Certificate GIA 5556715240

Diamond specifications and retailer prices

From £1,405 GBP
As of November 6, 2026
Save £1,865 GBP (57%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £3,903 GBP at NZ Jewellers · As of September 28, 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5556715240. Listed at 20 retailers as of November 2, 2026, with a 133% 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

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 5556715240
Dimensions6.85 × 6.88 × 4.16 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Needle
Top View
6.85 mm6.88 mm1.20 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5556715240
Side View
Table 61.0%Crown 34°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 60.6%

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 6
Current: £1,460 GBP|Low: £1,405 GBP|High: £3,305 GBP|Avg: £2,015 GBP|-2.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 11£1,405 GBP
Retailer 1£1,460 GBP
Retailer 8£1,636 GBP
Retailer 3£1,723 GBP
Retailer 12£1,737 GBP
Retailer 2£1,753 GBP
Retailer 5£1,951 GBP
Retailer 6£1,963 GBP
Retailer 4£2,089 GBP
Retailer 7£2,279 GBP
Retailer 9£2,324 GBP
Retailer 10£3,270 GBP

32 data points across 12 retailers

20 retailers£1,405 GBP to £3,270 GBP

A
Cheapest Retailer
-
£1,405 GBP
A
Retailer 2
-
£1,460 GBP
View
A
Retailer 3
-
£1,636 GBP
View
B+
Retailer 4
-
£1,723 GBP
View
Final sale: no returns
B+
Retailer 5
-
£1,737 GBP
View
B+
Retailer 6
-
£1,737 GBP
View
B+
Retailer 7
-
£1,753 GBP
View
Retailer 8
-
£1,867 GBP
View
Price last confirmed 39 days ago
B+
Retailer 9
-
£1,920 GBP
View
B+
Retailer 10
-
£1,951 GBP
View
Retailer 11
-
£1,953 GBP
View
Price last confirmed 38 days ago
B+
Retailer 12
-
£1,963 GBP
View
B+
Retailer 13
-
£1,972 GBP
View
Retailer 14
-
£2,089 GBP
View
Price last confirmed 31 days ago
Retailer 15
-
£2,154 GBP
View
Price last confirmed 38 days ago
B+
Retailer 16
-
£2,279 GBP
View
B+
Retailer 17
-
£2,324 GBP
View
B
Retailer 18
-
£3,270 GBP
View
Retailer 19
-
£3,903 GBP
View
Price last confirmed 34 days ago
Most Expensive
NZ Jewellers
6fdbfa8c-9bca-494e-ab38-9a8eada9774d · Sep 28
£3,903 GBP
$5,224 USD
View
Price last confirmed 39 days ago
19 more retailers have this diamond
Prices start from £1,405 GBPSave up to £1,865 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
£1,405 GBP