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Marquise|Natural|GIA

0.51ct E SI1 Marquise Natural Diamond

EX • E/SI1 • GIA 6565212812

Certificate GIA 6565212812

Diamond specifications and retailer prices

From £435 GBP
As of November 5, 2026
Save £1,311 GBP (75%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £1,982 GBP at MOH London · As of November 2, 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 E 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 6565212812. Listed at 15 retailers as of November 5, 2026, with a 302% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
E
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6565212812
Dimensions8.68 × 4.06 × 2.46 mm
L/W Ratio2.14
Culet sizeNone
Top View
8.68 mm4.06 mm0.51 ctE / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 6565212812
Side View
Table 59.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 60.7%

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 5
Current: £1,982 GBP|Low: £435 GBP|High: £1,982 GBP|Avg: £838 GBP
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
November 6, 2026
Retailer 8£435 GBP
Retailer 6£542 GBP
Retailer 2£758 GBP
Retailer 7£800 GBP
Retailer 4£992 GBP
Retailer 10£1,045 GBP
Retailer 13£1,132 GBP
Retailer 3£1,152 GBP
Retailer 14£1,196 GBP
Retailer 5£1,305 GBP
Retailer 11£1,389 GBP
Retailer 12£1,392 GBP
Retailer 9£1,746 GBP
MOH London£1,982 GBP

39 data points across 14 retailers

15 retailers£435 GBP to £1,746 GBP

A
Cheapest Retailer
-
£435 GBP
A
Retailer 2
-
£528 GBP
View
Retailer 3
-
£542 GBP
View
Price last confirmed 18 days ago
B+
Retailer 4
-
£758 GBP
View
B+
Retailer 5
-
£800 GBP
View
B
Retailer 6
-
£992 GBP
View
B
Retailer 7
-
£1,045 GBP
View
Final sale: no returns
B
Retailer 8
-
£1,132 GBP
View
B
Retailer 9
-
£1,152 GBP
View
B
Retailer 10
-
£1,196 GBP
View
B
Retailer 11
-
£1,305 GBP
View
B
Retailer 12
-
£1,389 GBP
View
B
Retailer 13
-
£1,392 GBP
View
C
Retailer 14
-
£1,746 GBP
View
Most Expensive
MOH London
239CFF363 · Nov 2
£1,982 GBP
View
Price under review
14 more retailers have this diamond
Prices start from £435 GBPSave up to £1,311 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
£435 GBP