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Marquise|Natural|GIA

1.20ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 6565379734

Certificate GIA 6565379734

Diamond specifications and retailer prices

From £2,516 GBP
$3,371 USD
As of November 2, 2026
Save £2,601 GBP (51%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £5,117 GBP at NZ Jewellers · As of October 30, 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 SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6565379734. Listed at 15 retailers as of October 30, 2026, with prices from £2,516 to £5,117, a £2,601 spread on the same certified stone. NZ Jewellers lists it at £5,117. 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 (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 6565379734
Dimensions10.33 × 5.62 × 3.42 mm
L/W Ratio1.84
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal, Cavity, Knot, Needle
Top View
10.33 mm5.62 mm1.20 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 6565379734
Side View
Table 63.0%CrownGirdle: VTN-VTKPavilionCulet: NoneDepth 60.9%

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 2
Current: £5,117 GBP|Low: £2,516 GBP|High: £5,117 GBP|Avg: £3,196 GBP
NZ Jewellers
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
November 2, 2026
Retailer 7£2,516 GBP
Retailer 11£2,553 GBP
Retailer 12£2,630 GBP
Retailer 15£2,795 GBP
Retailer 4£2,872 GBP
Retailer 10£2,922 GBP
Retailer 13£2,922 GBP
Retailer 8£3,008 GBP
Retailer 3£3,038 GBP
Retailer 5£3,038 GBP
Retailer 6£3,142 GBP
Retailer 2£3,269 GBP
Retailer 14£4,285 GBP
Retailer 9£4,912 GBP
NZ Jewellers£5,117 GBP

31 data points across 15 retailers

15 retailers£2,516 GBP to £5,117 GBP

B+
Cheapest Retailer
-
£2,516 GBP
$3,371 USD
B+
Retailer 2
-
£2,553 GBP
CA$4,750 CAD
View
B+
Retailer 3
-
£2,630 GBP
$3,524 USD
View
B
Retailer 4
-
£2,795 GBP
$3,745 USD
View
B
Retailer 5
-
£2,872 GBP
$3,848 USD
View
B
Retailer 6
-
£2,922 GBP
$3,915 USD
View
B
Retailer 7
-
£2,922 GBP
$3,915 USD
View
B
Retailer 8
-
£3,008 GBP
View
B
Retailer 9
-
£3,038 GBP
$4,070 USD
View
B
Retailer 10
-
£3,038 GBP
$4,070 USD
View
B
Retailer 11
-
£3,142 GBP
$4,210 USD
View
B
Retailer 12
-
£3,269 GBP
€4,171 EUR
View
B
Retailer 13
-
£4,285 GBP
$5,742 USD
View
B
Retailer 14
-
£4,912 GBP
View
Most Expensive
B
NZ Jewellers
617fe7ef-dabd-4410-8bcc-3b14343cc3c6 · Oct 30
£5,117 GBP
$6,856 USD
View
14 more retailers have this diamond
Prices start from £2,516 GBPSave up to £2,601 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
£2,516 GBP