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Marquise|Natural|GIA

2.51ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 6551291620

Certificate GIA 6551291620

Diamond specifications and retailer prices

From £16,010 GBP
$21,485 USD
As of November 2, 2026
Save £10,151 GBP (39%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £26,161 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 2.51ct natural marquise diamond

This 2.51ct natural marquise sits in the two to three carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6551291620. Listed at 10 retailers as of November 1, 2026, with prices from £16,010 to £26,161, a £10,151 spread on the same certified stone. MOH London lists it at £26,161. 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

2.51
Carat
I
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Pavilion angle40.07°
OriginNatural
Grading LabGIA
CertificateGIA 6551291620
Dimensions13.51 × 7.14 × 4.53 mm
L/W Ratio1.89
Key to symbols
Twinning Wisp, Feather, Crystal, Needle
Top View
13.51 mm7.14 mm2.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551291620
Side View
Table 62.0%CrownGirdle: STK-VTKPavilion 40.07°Culet: NoneDepth 63.5%

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: £26,161 GBP|Low: £13,096 GBP|High: £26,476 GBP|Avg: £17,984 GBP|-1.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
November 2, 2026
Retailer 9£13,096 GBP
Retailer 4£14,112 GBP
Retailer 8£14,306 GBP
Retailer 17£15,911 GBP
Retailer 3£16,010 GBP
Retailer 10£16,173 GBP
Retailer 12£17,190 GBP
Retailer 2£17,417 GBP
Retailer 18£17,627 GBP
Retailer 5£18,168 GBP
Retailer 7£18,168 GBP
Retailer 13£18,370 GBP
Retailer 6£18,771 GBP
Retailer 14£19,730 GBP
Retailer 11£19,787 GBP
Retailer 15£20,357 GBP
Retailer 16£23,731 GBP
MOH London£26,161 GBP

14 data points across 18 retailers

10 retailers£16,010 GBP to £26,161 GBP

A
Cheapest Retailer
-
£16,010 GBP
$21,485 USD
A
Retailer 2
-
£17,190 GBP
View
B+
Retailer 3
-
£17,417 GBP
$23,373 USD
View
Retailer 4
-
£17,627 GBP
$23,654 USD
View
Price last confirmed 11 days ago
B+
Retailer 5
-
£18,370 GBP
$24,651 USD
View
B+
Retailer 6
-
£19,730 GBP
$26,477 USD
View
B+
Retailer 7
-
£19,787 GBP
€25,288 EUR
View
Retailer 8
-
£20,357 GBP
$27,317 USD
View
Price last confirmed 11 days ago
Retailer 9
-
£23,731 GBP
$31,845 USD
View
Price last confirmed 12 days ago
Most Expensive
B
MOH London
ED73D92D5 · Nov 1
£26,161 GBP
View
9 more retailers have this diamond
Prices start from £16,010 GBPSave up to £10,151 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
2.51ct Marquise
£16,010 GBP