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Marquise|Natural|GIA

0.51ct H SI1 Marquise Natural Diamond

EX • H/SI1 • GIA 6565280558

Certificate GIA 6565280558

Diamond specifications and retailer prices

From £377 GBP
₹48,225 INR
As of November 2, 2026
Save £828 GBP (69%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,757 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 H 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 6565280558. Listed at 14 retailers as of November 1, 2026, with a 219% 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
H
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6565280558
Dimensions8.57 × 3.89 × 2.49 mm
L/W Ratio2.20
Culet sizeNone
Top View
8.57 mm3.89 mm0.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6565280558
Side View
Table 59.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 64.1%

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: £1,757 GBP|Low: £377 GBP|High: £1,757 GBP|Avg: £664 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 2, 2026
Retailer 2£377 GBP
Retailer 6£473 GBP
Retailer 5£681 GBP
Retailer 4£785 GBP
Retailer 9£855 GBP
Retailer 14£885 GBP
Retailer 11£959 GBP
Retailer 13£1,010 GBP
Retailer 12£1,043 GBP
Retailer 8£1,086 GBP
Retailer 3£1,107 GBP
Retailer 7£1,177 GBP
Retailer 10£1,205 GBP
MOH London£1,757 GBP

38 data points across 14 retailers

14 retailers£377 GBP to £1,205 GBP

A
Cheapest Retailer
-
£377 GBP
₹48,225 INR
A
Retailer 2
-
£473 GBP
$635 USD
View
B+
Retailer 3
-
£681 GBP
€870 EUR
View
B
Retailer 4
-
£785 GBP
ZAR 17,026 ZAR
View
B
Retailer 5
-
£855 GBP
$1,148 USD
View
B
Retailer 6
-
£885 GBP
$1,187 USD
View
Final sale: no returns
B
Retailer 7
-
£959 GBP
$1,287 USD
View
B
Retailer 8
-
£1,010 GBP
$1,355 USD
View
B
Retailer 9
-
£1,043 GBP
$1,400 USD
View
B
Retailer 10
-
£1,086 GBP
View
B
Retailer 11
-
£1,107 GBP
$1,485 USD
View
B
Retailer 12
-
£1,177 GBP
View
B
Retailer 13
-
£1,205 GBP
$1,617 USD
View
Most Expensive
MOH London
D5D7E2BD8 · Nov 2
£1,757 GBP
View
Price under review
13 more retailers have this diamond
Prices start from £377 GBPSave up to £828 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
£377 GBP