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Marquise|Natural|GIA

2.50ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 3555720776

Certificate GIA 3555720776

Diamond specifications and retailer prices

From £16,664 GBP
CA$31,059 CAD
As of November 2, 2026
Save £10,726 GBP (39%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £27,390 GBP at MOH London · As of November 2, 2026
View at MOH London

About this 2.5ct natural marquise diamond

This 2.5ct natural marquise sits in the two to three carat band, graded I 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 3555720776. Listed at 9 retailers as of November 2, 2026, with prices from £16,664 to £27,390, a £10,726 spread on the same certified stone. MOH London lists it at £27,390. 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

2.50
Carat
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 3555720776
Dimensions12.65 × 6.98 × 4.47 mm
L/W Ratio1.81
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Twinning Wisp, Feather, Cavity
Top View
12.65 mm6.98 mm2.50 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 3555720776
Side View
Table 60.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 64.0%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: £27,390 GBP|Low: £16,664 GBP|High: £27,720 GBP|Avg: £19,910 GBP|-1.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 3, 2026
Retailer 4£16,664 GBP
Retailer 9£16,768 GBP
Retailer 2£18,001 GBP
Retailer 6£18,242 GBP
Retailer 7£19,240 GBP
Retailer 8£20,665 GBP
Retailer 3£20,723 GBP
Retailer 5£21,321 GBP
MOH London£27,390 GBP

26 data points across 9 retailers

9 retailers£16,664 GBP to £27,390 GBP

A
Cheapest Retailer
-
£16,664 GBP
CA$31,059 CAD
A
Retailer 2
-
£16,768 GBP
$22,502 USD
View
B+
Retailer 3
-
£18,001 GBP
View
B+
Retailer 4
-
£18,242 GBP
$24,480 USD
View
B+
Retailer 5
-
£19,240 GBP
$25,819 USD
View
B
Retailer 6
-
£20,665 GBP
$27,731 USD
View
B+
Retailer 7
-
£20,723 GBP
€26,485 EUR
View
Retailer 8
-
£21,321 GBP
$28,611 USD
View
Price last confirmed 7 days ago
Most Expensive
B
MOH London
CB5FF2EBF · Nov 2
£27,390 GBP
View
8 more retailers have this diamond
Prices start from £16,664 GBPSave up to £10,726 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.

A
2.50ct Marquise
£16,664 GBP