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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 3555975462

Certificate GIA 3555975462

Diamond specifications and retailer prices

From £317 GBP
$425 USD
As of November 2, 2026
Save £1,031 GBP (76%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £1,347 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 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 3555975462. Listed at 12 retailers as of October 30, 2026, with prices from £317 to £1,347, a £1,031 spread on the same certified stone. NZ Jewellers lists it at £1,347. 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 3555975462
Dimensions4.06 × 9.29 × 2.43 mm
L/W Ratio2.29
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal
Top View
4.06 mm9.29 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 3555975462
Side View
Table 63.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 59.9%

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: £1,347 GBP|Low: £311 GBP|High: £1,440 GBP|Avg: £499 GBP|-6.4%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 2, 2026
Retailer 8£317 GBP
Retailer 9£344 GBP
Retailer 2£370 GBP
Retailer 3£379 GBP
Retailer 12£384 GBP
Retailer 5£396 GBP
Retailer 10£396 GBP
Retailer 11£402 GBP
Retailer 6£422 GBP
Retailer 7£428 GBP
Retailer 4£565 GBP
NZ Jewellers£1,347 GBP

35 data points across 12 retailers

12 retailers£317 GBP to £1,347 GBP

A
Cheapest Retailer
-
£317 GBP
$425 USD
Final sale: no returns
A
Retailer 2
-
£344 GBP
$461 USD
View
A
Retailer 3
-
£370 GBP
$496 USD
View
A
Retailer 4
-
£379 GBP
$508 USD
View
A
Retailer 5
-
£384 GBP
SGD 696 SGD
View
A
Retailer 6
-
£396 GBP
$532 USD
View
A
Retailer 7
-
£396 GBP
$532 USD
View
A
Retailer 8
-
£402 GBP
$540 USD
View
A
Retailer 9
-
£422 GBP
View
A
Retailer 10
-
£428 GBP
View
Retailer 11
-
£565 GBP
A$1,166 AUD
View
Price last confirmed 29 days ago
Most Expensive
B
NZ Jewellers
88376718-b8b2-4f68-9965-981372ec3c26 · Oct 30
£1,347 GBP
$1,808 USD
View
11 more retailers have this diamond
Prices start from £317 GBPSave up to £1,031 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
£317 GBP