CaratHunter
Plans
Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 7556820403

Certificate GIA 7556820403

Diamond specifications and retailer prices

From £498 GBP
SGD 903 SGD
As of October 31, 2026
Save £319 GBP (39%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £817 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 I 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 7556820403. Listed at 11 retailers as of October 31, 2026, with prices from £498 to £817, a £319 spread on the same certified stone. Frank Darling lists it at £817. 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
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle39.1°
Pavilion angle39.97°
OriginNatural
Grading LabGIA
CertificateGIA 7556820403
Dimensions8.47 × 3.98 × 2.54 mm
L/W Ratio2.13
Culet sizeNone
Top View
8.47 mm3.98 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 7556820403
Side View
Table 59.0%Crown 39.1°Girdle: MED-VTKPavilion 39.97°Culet: NoneDepth 63.7%

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: Oct 31
Current: £817 GBP|Low: £498 GBP|High: £817 GBP|Avg: £671 GBP
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 2, 2026
Retailer 6£498 GBP
Retailer 3£586 GBP
Retailer 2£701 GBP
Retailer 4£737 GBP
Retailer 5£748 GBP
Frank Darling£817 GBP

46 data points across 6 retailers

11 retailers£498 GBP to £817 GBP

A
Cheapest Retailer
-
£498 GBP
SGD 903 SGD
B+
Retailer 2
-
£503 GBP
SGD 912 SGD
View
B+
Retailer 3
-
£534 GBP
$716 USD
View
B+
Retailer 4
-
£586 GBP
View
B
Retailer 5
-
£624 GBP
$837 USD
View
B
Retailer 6
-
£654 GBP
$878 USD
View
B
Retailer 7
-
£701 GBP
€896 EUR
View
B
Retailer 8
-
£703 GBP
$944 USD
View
B
Retailer 9
-
£737 GBP
$989 USD
View
B
Retailer 10
-
£748 GBP
$1,003 USD
View
Most Expensive
B
Frank Darling
2667831HK · Nov 2
£817 GBP
$1,096 USD
View
10 more retailers have this diamond
Prices start from £498 GBPSave up to £319 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
£498 GBP