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Marquise|Natural|GIA

0.51ct J SI1 Marquise Natural Diamond

GD • J/SI1 • GIA 5556453982

Certificate GIA 5556453982

Diamond specifications and retailer prices

From £337 GBP
MYR 1,840 MYR
As of October 30, 2026
Save £111 GBP (25%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £448 GBP at Blue Nile · As of October 31, 2026
View at Blue Nile

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 standard cut grade stated by the retailer rather than the lab and certified by GIA 5556453982. Listed at 5 retailers as of October 30, 2026, with prices from £337 to £448, a £111 spread on the same certified stone. Blue Nile lists it at £448. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.51
Carat
J
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryGood
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 5556453982
Dimensions8.00 × 4.18 × 2.65 mm
L/W Ratio1.91
Culet sizeNone
Key to symbols
Crystal, Twinning Wisp
Top View
8.00 mm4.18 mm0.51 ctJ / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryGood
FluorescenceMedium
CertificateGIA 5556453982
Side View
Table 62.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 63.4%

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: Oct 30
Current: £448 GBP|Low: £296 GBP|High: £473 GBP|Avg: £385 GBP|-5.4%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 2, 2026
Retailer 5£337 GBP
Retailer 3£346 GBP
Retailer 4£373 GBP
Retailer 2£435 GBP
Blue Nile£448 GBP

41 data points across 5 retailers

5 retailers£337 GBP to £448 GBP

A
Cheapest Retailer
-
£337 GBP
MYR 1,840 MYR
B+
Retailer 2
-
£346 GBP
$464 USD
View
Final sale: no returns
B+
Retailer 3
-
£373 GBP
SGD 677 SGD
View
B+
Retailer 4
-
£435 GBP
View
Most Expensive
B+
Blue Nile
29346053 · Oct 31
£448 GBP
$601 USD
View
4 more retailers have this diamond
Prices start from £337 GBPSave up to £111 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
£337 GBP