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Marquise|Natural|GIA

0.51ct F SI2 Marquise Natural Diamond

EX • F/SI2 • GIA 1553998645

Certificate GIA 1553998645

Diamond specifications and retailer prices

From £362 GBP
HK$3,800 HKD
As of November 1, 2026
Save £1,003 GBP (73%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £1,365 GBP at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 0.51ct natural marquise diamond

This 0.51ct natural marquise sits in the half to three-quarter carat band, graded F colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1553998645. Listed at 15 retailers as of October 30, 2026, with prices from £362 to £1,365, a £1,003 spread on the same certified stone. NZ Jewellers lists it at £1,365. 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
F
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceVery Strong
OriginNatural
Grading LabGIA
CertificateGIA 1553998645
Dimensions8.26 × 4.07 × 2.63 mm
L/W Ratio2.03
Key to symbols
Feather, Crystal
Top View
8.26 mm4.07 mm0.51 ctF / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceVery Strong
CertificateGIA 1553998645
Side View
Table 56.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 64.6%

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 1
Current: £1,365 GBP|Low: £352 GBP|High: £1,423 GBP|Avg: £602 GBP|+4.4%
NZ Jewellers
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 3£362 GBP
Retailer 4£402 GBP
Retailer 12£435 GBP
Retailer 6£453 GBP
Retailer 13£469 GBP
Retailer 14£469 GBP
Retailer 11£502 GBP
Retailer 2£520 GBP
Retailer 7£530 GBP
Retailer 5£534 GBP
Retailer 10£545 GBP
Retailer 9£644 GBP
Retailer 8£1,005 GBP
NZ Jewellers£1,365 GBP

27 data points across 14 retailers

15 retailers£362 GBP to £1,365 GBP

A
Cheapest Retailer
-
£362 GBP
HK$3,800 HKD
B+
Retailer 2
-
£402 GBP
$539 USD
View
Final sale: no returns
A
Retailer 3
-
£435 GBP
$584 USD
View
A
Retailer 4
-
£453 GBP
SGD 822 SGD
View
Retailer 5
-
£466 GBP
$625 USD
View
Price last confirmed 25 days ago
A
Retailer 6
-
£469 GBP
$629 USD
View
A
Retailer 7
-
£469 GBP
$629 USD
View
A
Retailer 8
-
£502 GBP
$674 USD
View
A
Retailer 9
-
£520 GBP
View
B+
Retailer 10
-
£530 GBP
View
A
Retailer 11
-
£534 GBP
$717 USD
View
B+
Retailer 12
-
£545 GBP
View
B+
Retailer 13
-
£644 GBP
€823 EUR
View
B
Retailer 14
-
£1,005 GBP
View
Most Expensive
B
NZ Jewellers
cd7321ad-4ad1-46ac-9f13-61380a8cffbd · Oct 30
£1,365 GBP
$1,832 USD
View
14 more retailers have this diamond
Prices start from £362 GBPSave up to £1,003 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
£362 GBP