Marquise|Natural|GIA

1.20ct J SI2 Marquise Natural Diamond

EX • J/SI2 • GIA 3545449954

Certificate GIA 3545449954

Diamond specifications and retailer prices

From £2,478 GBP
As of November 6, 2026
Save £2,667 GBP (52%) vs most expensive(unlock to see where)
26 retailers carry this diamond
Most expensive: £5,644 GBP at NZ Jewellers · As of September 29, 2026
View at NZ Jewellers

About this 1.2ct natural marquise diamond

This 1.2ct natural marquise sits in the classic one-carat band, graded J colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 3545449954. Listed at 26 retailers as of November 4, 2026, with a 108% 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
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle38.39°
Pavilion angle39.22°
OriginNatural
Grading LabGIA
CertificateGIA 3545449954
Dimensions10.52 × 5.58 × 3.39 mm
L/W Ratio1.89
Top View
10.52 mm5.58 mm1.20 ctJ / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 3545449954
Side View
Table 64.0%Crown 38.39°Girdle: THN-VTKPavilion 39.22°Culet: NoneDepth 60.8%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £3,228 GBP|Low: £2,478 GBP|High: £5,221 GBP|Avg: £3,297 GBP|-1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 2£2,478 GBP
Retailer 8£2,583 GBP
Retailer 9£2,685 GBP
Retailer 7£2,708 GBP
Retailer 6£2,935 GBP
Retailer 1£3,228 GBP
Retailer 3£3,281 GBP
Retailer 5£3,665 GBP
Retailer 4£5,145 GBP

39 data points across 9 retailers

26 retailers£2,478 GBP to £5,145 GBP

B+
Cheapest Retailer
-
£2,478 GBP
B
Retailer 2
-
£2,583 GBP
View
B
Retailer 3
-
£2,685 GBP
View
B
Retailer 4
-
£2,708 GBP
View
Final sale: no returns
B
Retailer 5
-
£2,929 GBP
View
Retailer 6
-
£2,935 GBP
View
Price last confirmed 30 days ago
B
Retailer 7
-
£2,935 GBP
View
Retailer 8
-
£2,935 GBP
View
Price last confirmed 37 days ago
Retailer 9
-
£2,935 GBP
View
Price last confirmed 16 days ago
Retailer 10
-
£2,935 GBP
View
Price last confirmed 9 days ago
Retailer 11
-
£2,935 GBP
View
Price last confirmed 47 days ago
B
Retailer 12
-
£2,935 GBP
View
B
Retailer 13
-
£3,183 GBP
View
B
Retailer 14
-
£3,183 GBP
View
B
Retailer 15
-
£3,228 GBP
View
B
Retailer 16
-
£3,281 GBP
View
B
Retailer 17
-
£3,287 GBP
View
Retailer 18
-
£3,387 GBP
View
Price last confirmed 47 days ago
Retailer 19
-
£3,387 GBP
View
Price last confirmed 29 days ago
Retailer 20
-
£3,387 GBP
View
Price last confirmed 17 days ago
Retailer 21
-
£3,665 GBP
View
Price last confirmed 23 days ago
B
Retailer 22
-
£3,665 GBP
View
B
Retailer 23
-
£5,145 GBP
View
Retailer 24
-
£5,644 GBP
View
Price last confirmed 48 days ago
Retailer 25
-
£5,644 GBP
View
Price last confirmed 17 days ago
Most Expensive
NZ Jewellers
f4851853-d466-4855-8954-055568be135e · Sep 29
£5,644 GBP
$7,554 USD
View
Price last confirmed 38 days ago
25 more retailers have this diamond
Prices start from £2,478 GBPSave up to £2,667 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 Marquise
£2,478 GBP