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Marquise|Natural|GIA

1.20ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 5553986283

Certificate GIA 5553986283

Diamond specifications and retailer prices

From £1,788 GBP
As of November 6, 2026
Save £2,187 GBP (55%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £4,269 GBP at NZ Jewellers · As of September 27, 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 I 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 5553986283. Listed at 18 retailers as of November 1, 2026, with a 122% 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
I
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 5553986283
Dimensions10.69 × 5.62 × 3.41 mm
L/W Ratio1.90
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Twinning Wisp, Feather, Crystal, Cavity, Indented Natural, Natural
Top View
10.69 mm5.62 mm1.20 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 5553986283
Side View
Table 57.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 60.7%

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: £1,854 GBP|Low: £1,778 GBP|High: £4,017 GBP|Avg: £2,425 GBP|-3.1%
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 12£1,788 GBP
Retailer 1£1,854 GBP
Retailer 9£2,153 GBP
Retailer 4£2,194 GBP
Retailer 5£2,337 GBP
Retailer 2£2,377 GBP
Retailer 8£2,459 GBP
Retailer 10£2,468 GBP
Retailer 3£2,483 GBP
Retailer 6£2,491 GBP
Retailer 7£2,767 GBP
Retailer 11£3,975 GBP

27 data points across 12 retailers

18 retailers£1,788 GBP to £3,975 GBP

A
Cheapest Retailer
-
£1,788 GBP
A
Retailer 2
-
£1,854 GBP
View
A
Retailer 3
-
£2,153 GBP
View
B+
Retailer 4
-
£2,194 GBP
View
Final sale: no returns
B+
Retailer 5
-
£2,267 GBP
View
B+
Retailer 6
-
£2,337 GBP
View
Retailer 7
-
£2,377 GBP
View
Price last confirmed 22 days ago
B+
Retailer 8
-
£2,407 GBP
View
Retailer 9
-
£2,451 GBP
View
Price last confirmed 42 days ago
Retailer 10
-
£2,451 GBP
View
Price last confirmed 34 days ago
B+
Retailer 11
-
£2,459 GBP
View
B+
Retailer 12
-
£2,468 GBP
View
B+
Retailer 13
-
£2,483 GBP
View
B+
Retailer 14
-
£2,491 GBP
View
B+
Retailer 15
-
£2,767 GBP
View
Retailer 16
-
£2,827 GBP
View
Price last confirmed 40 days ago
B
Retailer 17
-
£3,975 GBP
View
Most Expensive
NZ Jewellers
53aac2cf-aa17-4cbf-abb5-3d74a658046a · Sep 27
£4,269 GBP
$5,714 USD
View
Price last confirmed 40 days ago
17 more retailers have this diamond
Prices start from £1,788 GBPSave up to £2,187 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 Marquise
£1,788 GBP