Marquise|Natural|GIA

0.51ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 7551413826

Certificate GIA 7551413826

Diamond specifications and retailer prices

From £252 GBP
₹32,182 INR
As of November 2, 2026
Save £533 GBP (68%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £1,204 GBP at NZ Jewellers · As of October 6, 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 7551413826. Listed at 9 retailers as of November 2, 2026, with a 212% 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
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 7551413826
Dimensions7.66 × 4.15 × 2.68 mm
L/W Ratio1.85
Girdle conditionSlightly Thick to Very Thick
Key to symbols
Cloud, Crystal
Top View
7.66 mm4.15 mm0.51 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 7551413826
Side View
Table 61.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 64.5%

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: £252 GBP|Low: £251 GBP|High: £895 GBP|Avg: £451 GBP|-12.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 2, 2026
Retailer 1£252 GBP
Retailer 4£286 GBP
Retailer 6£358 GBP
Retailer 5£364 GBP
Retailer 2£553 GBP
Retailer 3£785 GBP

46 data points across 6 retailers

9 retailers£252 GBP to £785 GBP

A
Cheapest Retailer
-
£252 GBP
₹32,182 INR
A
Retailer 2
-
£286 GBP
HK$3,000 HKD
View
Retailer 3
-
£358 GBP
SGD 650 SGD
View
Price last confirmed 8 days ago
Retailer 4
-
£364 GBP
$489 USD
View
Price last confirmed 13 days ago
Retailer 5
-
£374 GBP
$502 USD
View
Price last confirmed 32 days ago
Retailer 6
-
£384 GBP
$515 USD
View
Price last confirmed 26 days ago
B+
Retailer 7
-
£553 GBP
View
B
Retailer 8
-
£785 GBP
View
Most Expensive
NZ Jewellers
505a9c11-f64e-4cd1-b033-5cfdd55d25aa · Oct 6
£1,204 GBP
$1,616 USD
View
Price last confirmed 27 days ago
8 more retailers have this diamond
Prices start from £252 GBPSave up to £533 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
£252 GBP