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Marquise|Natural|GIA

1.20ct E SI1 Marquise Natural Diamond

ID • E/SI1 • GIA 3555986306

Certificate GIA 3555986306

Diamond specifications and retailer prices

From £3,737 GBP
As of November 5, 2026
Save £1,754 GBP (32%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £7,086 GBP at NZ Jewellers · As of September 20, 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 3555986306. Listed at 15 retailers as of November 5, 2026, with a 47% 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
E
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 3555986306
Dimensions10.13 × 5.51 × 3.47 mm
L/W Ratio1.84
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Twinning Wisp, Feather, Indented Natural, Natural
Top View
10.13 mm5.51 mm1.20 ctE / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 3555986306
Side View
Table 60.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 62.9%

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: £5,491 GBP|Low: £3,147 GBP|High: £6,828 GBP|Avg: £4,395 GBP|+35.7%
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
Retailer 16
Retailer 17
November 6, 2026
Retailer 6£3,147 GBP
Retailer 15£3,389 GBP
Retailer 7£3,584 GBP
Retailer 10£3,737 GBP
Retailer 5£3,864 GBP
Retailer 13£3,960 GBP
Retailer 14£4,171 GBP
Retailer 8£4,213 GBP
Retailer 17£4,237 GBP
Retailer 2£4,266 GBP
Retailer 9£4,351 GBP
Retailer 11£4,626 GBP
Retailer 16£4,759 GBP
Retailer 4£5,096 GBP
Retailer 1£5,491 GBP
Retailer 12£5,930 GBP
Retailer 3£6,828 GBP

22 data points across 17 retailers

15 retailers£3,737 GBP to £5,491 GBP

Retailer 1
-
£3,147 GBP
Price last confirmed 29 days ago
B+
Retailer 2
-
£3,737 GBP
View
B+
Retailer 3
-
£3,864 GBP
View
Retailer 4
-
£4,039 GBP
View
Price last confirmed 30 days ago
Retailer 5
-
£4,213 GBP
View
Price last confirmed 31 days ago
Retailer 6
-
£4,237 GBP
View
Price last confirmed 44 days ago
Retailer 7
-
£4,266 GBP
View
Price last confirmed 33 days ago
B
Retailer 8
-
£4,531 GBP
View
B
Retailer 9
-
£4,626 GBP
View
Retailer 10
-
£4,888 GBP
View
Price last confirmed 45 days ago
Retailer 11
-
£5,096 GBP
View
Price last confirmed 42 days ago
B
Retailer 12
-
£5,491 GBP
View
Retailer 13
-
£5,930 GBP
View
Price last confirmed 30 days ago
Retailer 14
-
£6,828 GBP
View
Price last confirmed 32 days ago
Most Expensive
NZ Jewellers
b2e0996d-3420-43f7-9cac-e9fec48854ad · Sep 20
£7,086 GBP
$9,537 USD
View
Price last confirmed 46 days ago
14 more retailers have this diamond
Prices start from £3,737 GBPSave up to £1,754 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
£3,737 GBP