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Marquise|Natural|GIA

1.23ct D SI1 Marquise Natural Diamond

EX • D/SI1 • GIA 6545405876

Certificate GIA 6545405876

Diamond specifications and retailer prices

From £4,832 GBP
As of November 6, 2026
Save £3,974 GBP (45%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £8,806 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 D 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 6545405876. Listed at 10 retailers as of November 4, 2026, with prices from £4,832 to £8,806, a £3,974 spread on the same certified stone. MOH London lists it at £8,806. 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
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6545405876
Dimensions11.14 × 5.62 × 3.51 mm
L/W Ratio1.98
Top View
11.14 mm5.62 mm1.23 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6545405876
Side View
Table 59.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 62.4%

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: £8,806 GBP|Low: £4,744 GBP|High: £9,173 GBP|Avg: £6,077 GBP|-4.0%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 7£4,832 GBP
Retailer 8£5,009 GBP
Retailer 4£5,219 GBP
Retailer 5£5,238 GBP
Retailer 2£5,901 GBP
Retailer 6£6,100 GBP
Retailer 9£6,428 GBP
Retailer 3£6,894 GBP
MOH London£8,806 GBP

39 data points across 9 retailers

10 retailers£4,832 GBP to £8,806 GBP

B+
Cheapest Retailer
-
£4,832 GBP
B+
Retailer 2
-
£4,981 GBP
View
B+
Retailer 3
-
£5,009 GBP
View
B
Retailer 4
-
£5,219 GBP
View
Final sale: no returns
B
Retailer 5
-
£5,238 GBP
View
B
Retailer 6
-
£5,901 GBP
View
B
Retailer 7
-
£6,100 GBP
View
B
Retailer 8
-
£6,428 GBP
View
B
Retailer 9
-
£6,894 GBP
View
Most Expensive
B
MOH London
98A34FD36 · Nov 4
£8,806 GBP
View
9 more retailers have this diamond
Prices start from £4,832 GBPSave up to £3,974 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
£4,832 GBP