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Marquise|Natural|GIA

0.51ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 6551764597

Certificate GIA 6551764597

Diamond specifications and retailer prices

From £406 GBP
As of November 3, 2026
Save £867 GBP (68%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £1,272 GBP at NZ Jewellers · As of November 3, 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 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 6551764597. Listed at 6 retailers as of November 3, 2026, with prices from £406 to £1,272, a £867 spread on the same certified stone. NZ Jewellers lists it at £1,272. 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
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6551764597
Dimensions7.98 × 3.83 × 2.38 mm
L/W Ratio2.08
Girdle conditionThick
Key to symbols
Twinning Wisp
Top View
7.98 mm3.83 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6551764597
Side View
Table 61.0%CrownGirdlePavilionCulet: NoneDepth 62.2%

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 3
Current: £1,272 GBP|Low: £406 GBP|High: £1,303 GBP|Avg: £701 GBP|-2.4%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 2, 2026
Retailer 4£406 GBP
Retailer 6£437 GBP
Retailer 2£484 GBP
Retailer 5£533 GBP
Retailer 3£936 GBP
NZ Jewellers£1,272 GBP

28 data points across 6 retailers

6 retailers£406 GBP to £1,272 GBP

A
Cheapest Retailer
-
£406 GBP
A
Retailer 2
-
£437 GBP
View
A
Retailer 3
-
£484 GBP
View
B+
Retailer 4
-
£533 GBP
View
B
Retailer 5
-
£936 GBP
View
Most Expensive
B
NZ Jewellers
c3f34689-ff0b-44b5-8d2f-fa347761345c · Nov 3
£1,272 GBP
$1,703 USD
View
5 more retailers have this diamond
Prices start from £406 GBPSave up to £867 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
£406 GBP