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Marquise|Natural|GIA

1.23ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 6243044009

Certificate GIA 6243044009

Diamond specifications and retailer prices

From £2,474 GBP
As of November 6, 2026
Save £2,756 GBP (53%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £5,230 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1.23ct natural marquise diamond

This 1.23ct 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 6243044009. Listed at 10 retailers as of November 4, 2026, with prices from £2,474 to £5,230, a £2,756 spread on the same certified stone. MOH London lists it at £5,230. 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

1.23
Carat
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6243044009
Dimensions10.73 × 5.65 × 3.58 mm
L/W Ratio1.90
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Twinning Wisp, Feather, Crystal
Top View
10.73 mm5.65 mm1.23 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6243044009
Side View
Table 60.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 63.4%

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 6
Current: £5,230 GBP|Low: £2,474 GBP|High: £5,307 GBP|Avg: £3,445 GBP|-1.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 11£2,474 GBP
Retailer 3£2,795 GBP
Retailer 5£2,863 GBP
Retailer 7£2,950 GBP
Retailer 4£3,278 GBP
Retailer 9£3,278 GBP
Retailer 6£3,367 GBP
Retailer 10£3,522 GBP
Retailer 2£3,715 GBP
Retailer 8£4,807 GBP
MOH London£5,230 GBP

18 data points across 11 retailers

10 retailers£2,474 GBP to £5,230 GBP

B+
Cheapest Retailer
-
£2,474 GBP
B
Retailer 2
-
£2,795 GBP
View
B
Retailer 3
-
£2,863 GBP
View
B
Retailer 4
-
£2,950 GBP
View
B
Retailer 5
-
£3,278 GBP
View
B
Retailer 6
-
£3,278 GBP
View
B
Retailer 7
-
£3,367 GBP
View
B
Retailer 8
-
£3,715 GBP
View
B
Retailer 9
-
£4,807 GBP
View
Most Expensive
B
MOH London
81CE3D562 · Nov 4
£5,230 GBP
View
9 more retailers have this diamond
Prices start from £2,474 GBPSave up to £2,756 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+
1.23ct Marquise
£2,474 GBP