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Marquise|Natural|GIA

1.23ct D SI1 Marquise Natural Diamond

EX • D/SI1 • GIA 1549965780

Certificate GIA 1549965780

Diamond specifications and retailer prices

From £4,294 GBP
As of November 6, 2026
Save £2,965 GBP (41%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £7,259 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 1549965780. Listed at 9 retailers as of November 4, 2026, with prices from £4,294 to £7,259, a £2,965 spread on the same certified stone. MOH London lists it at £7,259. 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
PolishVery Good
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1549965780
Dimensions12.23 × 5.23 × 3.32 mm
L/W Ratio2.34
Key to symbols
Twinning Wisp, Feather, Crystal, Needle, Indented Natural
Top View
12.23 mm5.23 mm1.23 ctD / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateGIA 1549965780
Side View
Table 57.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 63.5%

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: £7,259 GBP|Low: £3,706 GBP|High: £7,367 GBP|Avg: £4,927 GBP|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 5, 2026
Retailer 4£3,718 GBP
Retailer 6£3,939 GBP
Retailer 5£4,294 GBP
Retailer 2£4,692 GBP
Retailer 7£4,845 GBP
Retailer 3£5,375 GBP
MOH London£7,259 GBP

41 data points across 7 retailers

9 retailers£4,294 GBP to £7,259 GBP

Retailer 1
-
£3,718 GBP
Price last confirmed 15 days ago
Retailer 2
-
£3,907 GBP
View
Price last confirmed 15 days ago
Retailer 3
-
£4,060 GBP
View
Price last confirmed 30 days ago
B+
Retailer 4
-
£4,294 GBP
View
B+
Retailer 5
-
£4,692 GBP
View
Retailer 6
-
£4,845 GBP
View
Price last confirmed 34 days ago
B
Retailer 7
-
£5,059 GBP
View
B
Retailer 8
-
£5,375 GBP
View
Most Expensive
B
MOH London
83C545528 · Nov 4
£7,259 GBP
View
8 more retailers have this diamond
Prices start from £4,294 GBPSave up to £2,965 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
£4,294 GBP