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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 1555183694

Certificate GIA 1555183694

Diamond specifications and retailer prices

From £283 GBP
₹36,086 INR
As of November 1, 2026
Save £997 GBP (78%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £1,280 GBP at NZ Jewellers · As of October 30, 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 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 1555183694. Listed at 18 retailers as of October 30, 2026, with prices from £283 to £1,280, a £997 spread on the same certified stone. NZ Jewellers lists it at £1,280. 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
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 1555183694
Dimensions9.37 × 4.07 × 2.42 mm
L/W Ratio2.30
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal
Top View
9.37 mm4.07 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 1555183694
Side View
Table 61.0%CrownGirdle: THN-THKPavilionCulet: NoneDepth 59.5%

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 1
Current: £1,280 GBP|Low: £283 GBP|High: £1,280 GBP|Avg: £554 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
November 2, 2026
Retailer 10£283 GBP
Retailer 4£376 GBP
Retailer 3£408 GBP
Retailer 14£440 GBP
Retailer 15£440 GBP
Retailer 7£471 GBP
Retailer 12£471 GBP
Retailer 2£501 GBP
Retailer 9£515 GBP
Retailer 5£556 GBP
Retailer 6£569 GBP
Retailer 8£607 GBP
Retailer 13£630 GBP
Retailer 11£943 GBP
NZ Jewellers£1,280 GBP

25 data points across 15 retailers

18 retailers£283 GBP to £1,280 GBP

A
Cheapest Retailer
-
£283 GBP
₹36,086 INR
B+
Retailer 2
-
£376 GBP
$504 USD
View
Final sale: no returns
A
Retailer 3
-
£408 GBP
$547 USD
View
Retailer 4
-
£425 GBP
SGD 769 SGD
View
Price last confirmed 11 days ago
A
Retailer 5
-
£440 GBP
$589 USD
View
A
Retailer 6
-
£440 GBP
$589 USD
View
A
Retailer 7
-
£471 GBP
$631 USD
View
B+
Retailer 8
-
£471 GBP
$631 USD
View
B+
Retailer 9
-
£501 GBP
View
B+
Retailer 10
-
£512 GBP
$686 USD
View
B+
Retailer 11
-
£515 GBP
View
B+
Retailer 12
-
£556 GBP
$745 USD
View
B+
Retailer 13
-
£569 GBP
$763 USD
View
B+
Retailer 14
-
£607 GBP
€775 EUR
View
Retailer 15
-
£621 GBP
A$1,280 AUD
View
Price last confirmed 29 days ago
B+
Retailer 16
-
£630 GBP
ZAR 13,639 ZAR
View
B
Retailer 17
-
£943 GBP
View
Most Expensive
B
NZ Jewellers
4eef1496-8124-46e6-a1a6-194cfc9e4067 · Oct 30
£1,280 GBP
$1,715 USD
View
17 more retailers have this diamond
Prices start from £283 GBPSave up to £997 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
£283 GBP