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Marquise|Natural|GIA

0.51ct K SI2 Marquise Natural Diamond

GD • K/SI2 • GIA 5436969478

Certificate GIA 5436969478

Diamond specifications and retailer prices

From £198 GBP
As of November 6, 2026
Save £276 GBP (58%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £474 GBP at 77 Diamonds · As of November 6, 2026
View at 77 Diamonds

About this 0.51ct natural marquise diamond

This 0.51ct natural marquise sits in the half to three-quarter carat band, graded K colour (faint-tinted) and SI2 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 5436969478. Listed at 3 retailers as of November 6, 2026, with prices from £198 to £474, a £276 spread on the same certified stone. 77 Diamonds lists it at £474. 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
K
Colour
SI2
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishVery Good
SymmetryVery Good
FluorescenceStrong
OriginNatural
Grading LabGIA
CertificateGIA 5436969478
Dimensions7.30 × 4.09 × 2.83 mm
L/W Ratio1.78
Top View
7.30 mm4.09 mm0.51 ctK / SI2
OriginNatural
CutGood
PolishVery Good
SymmetryVery Good
FluorescenceStrong
CertificateGIA 5436969478
Side View
Table 54.0%CrownGirdle: THK-ETKPavilionCulet: NoneDepth 69.1%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £474 GBP|Low: £198 GBP|High: £483 GBP|Avg: £358 GBP|+0.6%
77 Diamonds
Retailer 2
Retailer 3
November 6, 2026
Retailer 2£198 GBP
Retailer 3£394 GBP
77 Diamonds£474 GBP

42 data points across 3 retailers

3 retailers£198 GBP to £474 GBP

B+
Cheapest Retailer
-
£198 GBP
B+
Retailer 2
-
£394 GBP
View
Most Expensive
B
77 Diamonds
MQCPJUCJWXXC · Nov 6
£474 GBP
View
2 more retailers have this diamond
Prices start from £198 GBPSave up to £276 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.

B+
0.51ct Marquise
£198 GBP