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Round|Natural|GIA

1.20ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 1553140319

Certificate GIA 1553140319

Diamond specifications and retailer prices

From £1,377 GBP
As of November 6, 2026
Save £1,793 GBP (57%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £3,832 GBP at NZ Jewellers · As of October 3, 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 1553140319. Listed at 20 retailers as of November 4, 2026, with a 130% 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 angle33°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1553140319
Dimensions6.81 × 6.87 × 4.12 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal, Cloud, Cavity, Needle
Top View
6.81 mm6.87 mm1.20 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1553140319
Side View
Table 62.0%Crown 33°Girdle: Slightly ThickPavilion 41°Culet: NoneDepth 60.2%

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: £1,433 GBP|Low: £1,377 GBP|High: £3,249 GBP|Avg: £2,020 GBP|-3.2%
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
November 6, 2026
Retailer 12£1,377 GBP
Retailer 1£1,433 GBP
Retailer 10£1,606 GBP
Retailer 2£1,674 GBP
Retailer 13£1,709 GBP
Retailer 4£1,868 GBP
Retailer 7£1,908 GBP
Retailer 6£1,915 GBP
Retailer 3£1,919 GBP
Retailer 9£2,214 GBP
Retailer 8£2,252 GBP
Retailer 5£2,256 GBP
Retailer 11£3,170 GBP

32 data points across 13 retailers

20 retailers£1,377 GBP to £3,170 GBP

A
Cheapest Retailer
-
£1,377 GBP
A
Retailer 2
-
£1,433 GBP
View
A
Retailer 3
-
£1,606 GBP
View
B+
Retailer 4
-
£1,674 GBP
View
Final sale: no returns
B+
Retailer 5
-
£1,709 GBP
View
B+
Retailer 6
-
£1,719 GBP
View
B+
Retailer 7
-
£1,722 GBP
View
Retailer 8
-
£1,833 GBP
View
Price last confirmed 39 days ago
B+
Retailer 9
-
£1,868 GBP
View
B+
Retailer 10
-
£1,908 GBP
View
B+
Retailer 11
-
£1,915 GBP
View
Retailer 12
-
£1,917 GBP
View
Price last confirmed 38 days ago
B+
Retailer 13
-
£1,919 GBP
View
Retailer 14
-
£2,115 GBP
View
Price last confirmed 38 days ago
B+
Retailer 15
-
£2,214 GBP
View
B+
Retailer 16
-
£2,252 GBP
View
Retailer 17
-
£2,256 GBP
View
Price last confirmed 30 days ago
B
Retailer 18
-
£3,170 GBP
View
Retailer 19
-
£3,832 GBP
View
Price last confirmed 39 days ago
Most Expensive
NZ Jewellers
8682ebd1-3440-4309-9dfb-944ef4ce9066 · Oct 3
£3,832 GBP
$5,129 USD
View
Price last confirmed 34 days ago
19 more retailers have this diamond
Prices start from £1,377 GBPSave up to £1,793 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
£1,377 GBP