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Marquise|Natural|GIA

0.51ct J SI1 Marquise Natural Diamond

ID • J/SI1 • GIA 6335211635

Certificate GIA 6335211635

Diamond specifications and retailer prices

From £429 GBP
HK$4,500 HKD
As of November 1, 2026
Save £741 GBP (63%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £1,590 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 J 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 6335211635. Listed at 17 retailers as of November 1, 2026, with a 173% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
J
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishVery Good
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6335211635
Dimensions6.92 × 4.43 × 2.69 mm
L/W Ratio1.56
Top View
6.92 mm4.43 mm0.51 ctJ / SI1
OriginNatural
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6335211635
Side View
Table 60.0%CrownGirdle: Very ThickPavilionCulet: NoneDepth 60.7%

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: £1,590 GBP|Low: £428 GBP|High: £1,590 GBP|Avg: £660 GBP
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
Retailer 15
Retailer 16
Retailer 17
November 2, 2026
Retailer 7£429 GBP
Retailer 8£443 GBP
Retailer 6£455 GBP
Retailer 3£468 GBP
Retailer 15£507 GBP
Retailer 16£507 GBP
Retailer 14£527 GBP
Retailer 17£585 GBP
Retailer 4£595 GBP
Retailer 9£606 GBP
Retailer 10£620 GBP
Retailer 2£622 GBP
Retailer 5£645 GBP
Retailer 12£721 GBP
Retailer 13£783 GBP
Retailer 11£1,171 GBP
NZ Jewellers£1,590 GBP

26 data points across 17 retailers

17 retailers£429 GBP to £1,171 GBP

A
Cheapest Retailer
-
£429 GBP
HK$4,500 HKD
B+
Retailer 2
-
£455 GBP
$610 USD
View
B+
Retailer 3
-
£468 GBP
$628 USD
View
Final sale: no returns
B+
Retailer 4
-
£507 GBP
$680 USD
View
B+
Retailer 5
-
£507 GBP
$680 USD
View
B+
Retailer 6
-
£527 GBP
$707 USD
View
B+
Retailer 7
-
£527 GBP
SGD 956 SGD
View
B
Retailer 8
-
£585 GBP
$785 USD
View
B
Retailer 9
-
£595 GBP
$799 USD
View
B
Retailer 10
-
£606 GBP
$813 USD
View
B
Retailer 11
-
£620 GBP
View
B+
Retailer 12
-
£622 GBP
View
B
Retailer 13
-
£645 GBP
$865 USD
View
B
Retailer 14
-
£721 GBP
€922 EUR
View
B
Retailer 15
-
£783 GBP
ZAR 16,968 ZAR
View
B
Retailer 16
-
£1,171 GBP
View
Most Expensive
NZ Jewellers
8cb642c9-93eb-4818-901d-5b6b7c670ec0 · Oct 30
£1,590 GBP
$2,134 USD
View
Price under review
16 more retailers have this diamond
Prices start from £429 GBPSave up to £741 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
£429 GBP