CaratHunter
Plans
Marquise|Natural|GIA

0.51ct H SI1 Marquise Natural Diamond

VG • H/SI1 • GIA 1563140120

Certificate GIA 1563140120

Diamond specifications and retailer prices

From £340 GBP
SGD 616 SGD
As of October 31, 2026
Save £345 GBP (50%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £685 GBP at Frank Darling · As of November 2, 2026
View at Frank Darling

About this 0.51ct natural marquise diamond

This 0.51ct natural marquise sits in the half to three-quarter carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 1563140120. Listed at 10 retailers as of October 31, 2026, with prices from £340 to £685, a £345 spread on the same certified stone. Frank Darling lists it at £685. 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
H
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1563140120
Dimensions8.32 × 4.12 × 2.41 mm
L/W Ratio2.02
Culet sizeNone
Top View
8.32 mm4.12 mm0.51 ctH / SI1
OriginNatural
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 1563140120
Side View
Table 60.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 58.4%

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 31
Current: £685 GBP|Low: £340 GBP|High: £703 GBP|Avg: £499 GBP|-2.6%
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 2, 2026
Retailer 8£340 GBP
Retailer 9£365 GBP
Retailer 3£376 GBP
Retailer 7£429 GBP
Retailer 6£475 GBP
Retailer 5£511 GBP
Retailer 2£523 GBP
Retailer 4£536 GBP
Retailer 10£553 GBP
Frank Darling£685 GBP

38 data points across 10 retailers

10 retailers£340 GBP to £685 GBP

A
Cheapest Retailer
-
£340 GBP
SGD 616 SGD
A
Retailer 2
-
£365 GBP
SGD 662 SGD
View
A
Retailer 3
-
£376 GBP
$505 USD
View
A
Retailer 4
-
£429 GBP
View
B+
Retailer 5
-
£475 GBP
$638 USD
View
B+
Retailer 6
-
£511 GBP
$686 USD
View
B+
Retailer 7
-
£523 GBP
€668 EUR
View
B+
Retailer 8
-
£536 GBP
$719 USD
View
B+
Retailer 9
-
£553 GBP
$742 USD
View
Most Expensive
B
Frank Darling
2679945HK · Nov 2
£685 GBP
$919 USD
View
9 more retailers have this diamond
Prices start from £340 GBPSave up to £345 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
£340 GBP