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Marquise|Natural|GIA

0.51ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 2557664386

Certificate GIA 2557664386

Diamond specifications and retailer prices

From £306 GBP
As of November 6, 2026
Save £659 GBP (68%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £965 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 0.51ct natural marquise diamond

This 0.51ct natural marquise sits in the half to three-quarter 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 2557664386. Listed at 4 retailers as of November 4, 2026, with prices from £306 to £965, a £659 spread on the same certified stone. MOH London lists it at £965. 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

0.51
Carat
I
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 2557664386
Dimensions8.39 × 4.11 × 2.59 mm
L/W Ratio2.04
Top View
8.39 mm4.11 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 2557664386
Side View
Table 61.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 62.9%

Caratlytics Score

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

Price History

Last verified: Nov 6
Current: £965 GBP|Low: £306 GBP|High: £978 GBP|Avg: £592 GBP|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
November 6, 2026
Retailer 2£306 GBP
Retailer 4£504 GBP
Retailer 3£618 GBP
MOH London£965 GBP

43 data points across 4 retailers

4 retailers£306 GBP to £965 GBP

A
Cheapest Retailer
-
£306 GBP
B+
Retailer 2
-
£504 GBP
View
B
Retailer 3
-
£618 GBP
View
Most Expensive
B
MOH London
55019AB69 · Nov 4
£965 GBP
View
3 more retailers have this diamond
Prices start from £306 GBPSave up to £659 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
0.51ct Marquise
£306 GBP