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Marquise|Natural|GIA

0.51ct K SI1 Marquise Natural Diamond

EX • K/SI1 • GIA 6542875575

Certificate GIA 6542875575

Diamond specifications and retailer prices

From £305 GBP
As of November 5, 2026
Save £864 GBP (74%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £1,169 GBP at NZ Jewellers · As of November 5, 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 K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6542875575. Listed at 11 retailers as of November 5, 2026, with prices from £305 to £1,169, a £864 spread on the same certified stone. NZ Jewellers lists it at £1,169. 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
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6542875575
Dimensions8.25 × 4.10 × 2.70 mm
L/W Ratio2.01
Top View
8.25 mm4.10 mm0.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6542875575
Side View
Table 57.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 65.9%

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 5
Current: £1,169 GBP|Low: £305 GBP|High: £1,206 GBP|Avg: £459 GBP|-3.0%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 9£305 GBP
Retailer 7£328 GBP
Retailer 3£332 GBP
Retailer 4£332 GBP
Retailer 8£352 GBP
Retailer 10£352 GBP
Retailer 2£372 GBP
Retailer 5£374 GBP
Retailer 11£464 GBP
Retailer 6£704 GBP
NZ Jewellers£1,169 GBP

36 data points across 11 retailers

11 retailers£305 GBP to £1,169 GBP

A
Cheapest Retailer
-
£305 GBP
A
Retailer 2
-
£328 GBP
View
Retailer 3
-
£332 GBP
View
Price last confirmed 8 days ago
A
Retailer 4
-
£332 GBP
View
A
Retailer 5
-
£352 GBP
View
A
Retailer 6
-
£352 GBP
View
A
Retailer 7
-
£372 GBP
View
A
Retailer 8
-
£374 GBP
View
B+
Retailer 9
-
£464 GBP
View
B
Retailer 10
-
£704 GBP
View
Most Expensive
B
NZ Jewellers
6fbe9dc0-4941-4bfd-b195-6b925748c946 · Nov 5
£1,169 GBP
$1,574 USD
View
10 more retailers have this diamond
Prices start from £305 GBPSave up to £864 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
£305 GBP