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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 6562612974

Certificate GIA 6562612974

Diamond specifications and retailer prices

From £339 GBP
$455 USD
As of November 2, 2026
Save £1,069 GBP (76%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,408 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 SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6562612974. Listed at 14 retailers as of November 2, 2026, with prices from £339 to £1,408, a £1,069 spread on the same certified stone. NZ Jewellers lists it at £1,408. 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
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 6562612974
Dimensions8.00 × 4.23 × 2.67 mm
L/W Ratio1.89
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal
Top View
8.00 mm4.23 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 6562612974
Side View
Table 57.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 63.0%

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: £1,408 GBP|Low: £339 GBP|High: £1,440 GBP|Avg: £534 GBP|+17.1%
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 3, 2026
Retailer 11£339 GBP
Retailer 13£367 GBP
Retailer 12£380 GBP
Retailer 7£396 GBP
Retailer 6£405 GBP
Retailer 5£408 GBP
Retailer 9£424 GBP
Retailer 14£424 GBP
Retailer 3£428 GBP
Retailer 10£451 GBP
Retailer 2£459 GBP
Retailer 4£507 GBP
Retailer 8£849 GBP
NZ Jewellers£1,408 GBP

14 data points across 14 retailers

14 retailers£339 GBP to £1,408 GBP

A
Cheapest Retailer
-
£339 GBP
$455 USD
Final sale: no returns
A
Retailer 2
-
£367 GBP
$493 USD
View
A
Retailer 3
-
£380 GBP
$510 USD
View
A
Retailer 4
-
£396 GBP
$531 USD
View
A
Retailer 5
-
£405 GBP
$543 USD
View
A
Retailer 6
-
£408 GBP
SGD 740 SGD
View
A
Retailer 7
-
£424 GBP
$569 USD
View
A
Retailer 8
-
£424 GBP
$569 USD
View
A
Retailer 9
-
£428 GBP
$575 USD
View
A
Retailer 10
-
£451 GBP
View
A
Retailer 11
-
£459 GBP
View
B+
Retailer 12
-
£507 GBP
$680 USD
View
B
Retailer 13
-
£849 GBP
View
Most Expensive
C
NZ Jewellers
0b52d66a-7e99-4f9c-a014-51de6eea188d · Nov 3
£1,408 GBP
$1,890 USD
View
13 more retailers have this diamond
Prices start from £339 GBPSave up to £1,069 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
£339 GBP