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Marquise|Natural|GIA

1.20ct J SI1 Marquise Natural Diamond

ID • J/SI1 • GIA 7551009950

Certificate GIA 7551009950

Diamond specifications and retailer prices

From £2,694 GBP
$3,615 USD
As of November 2, 2026
Save £2,958 GBP (52%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £5,652 GBP at MOH London · As of November 1, 2026
View at MOH London

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 7551009950. Listed at 18 retailers as of November 1, 2026, with prices from £2,694 to £5,652, a £2,958 spread on the same certified stone. MOH London lists it at £5,652. 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
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 7551009950
Dimensions10.45 × 5.51 × 3.48 mm
L/W Ratio1.90
Culet sizeNone
Key to symbols
Cloud, Crystal, Feather, Needle
Top View
10.45 mm5.51 mm1.20 ctJ / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 7551009950
Side View
Table 61.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 63.1%

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: £5,652 GBP|Low: £2,334 GBP|High: £5,720 GBP|Avg: £3,497 GBP|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 2, 2026
Retailer 3£2,694 GBP
Retailer 2£2,801 GBP
Retailer 9£2,887 GBP
Retailer 10£3,215 GBP
Retailer 11£3,268 GBP
Retailer 4£3,312 GBP
Retailer 12£3,366 GBP
Retailer 6£3,529 GBP
Retailer 8£3,577 GBP
Retailer 5£3,785 GBP
Retailer 7£4,362 GBP
MOH London£5,652 GBP

44 data points across 12 retailers

18 retailers£2,694 GBP to £5,652 GBP

B+
Cheapest Retailer
-
£2,694 GBP
$3,615 USD
B
Retailer 2
-
£2,773 GBP
$3,721 USD
View
B+
Retailer 3
-
£2,801 GBP
$3,758 USD
View
B
Retailer 4
-
£2,829 GBP
$3,797 USD
View
B
Retailer 5
-
£2,836 GBP
$3,805 USD
View
B
Retailer 6
-
£3,199 GBP
$4,293 USD
View
Retailer 7
-
£3,215 GBP
$4,314 USD
View
Price last confirmed 8 days ago
Retailer 8
-
£3,268 GBP
$4,385 USD
View
Price last confirmed 12 days ago
B
Retailer 9
-
£3,312 GBP
A$6,838 AUD
View
Retailer 10
-
£3,356 GBP
$4,503 USD
View
Price last confirmed 10 days ago
B
Retailer 11
-
£3,366 GBP
$4,517 USD
View
B
Retailer 12
-
£3,529 GBP
View
Retailer 13
-
£3,577 GBP
A$7,386 AUD
View
Price last confirmed 23 days ago
B
Retailer 14
-
£3,689 GBP
$4,951 USD
View
B
Retailer 15
-
£3,785 GBP
€4,837 EUR
View
B
Retailer 16
-
£4,362 GBP
ZAR 94,567 ZAR
View
Retailer 17
-
£5,135 GBP
$6,890 USD
View
Price last confirmed 9 days ago
Most Expensive
B
MOH London
CBFC25F1D · Nov 1
£5,652 GBP
View
17 more retailers have this diamond
Prices start from £2,694 GBPSave up to £2,958 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
£2,694 GBP