Marquise|Natural|GIA

1.00ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 1558052400

Certificate GIA 1558052400

Diamond specifications and retailer prices

From £2,590 GBP
As of November 3, 2026
Save £634 GBP (20%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £4,717 GBP at NZ Jewellers · As of October 21, 2026
View at NZ Jewellers

About this 1ct natural marquise diamond

This 1ct natural marquise sits in the classic one-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 1558052400. Listed at 16 retailers as of November 3, 2026, with a relatively tight 24% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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

1.00
Carat
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1558052400
Dimensions9.99 × 5.30 × 3.09 mm
L/W Ratio1.88
Culet sizeNone
Top View
9.99 mm5.30 mm1.00 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 1558052400
Side View
Table 62.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 58.2%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 3
Current: £4,717 GBP|Low: £2,177 GBP|High: £4,717 GBP|Avg: £2,882 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
Retailer 16
Retailer 17
November 4, 2026
Retailer 17£2,177 GBP
Retailer 3£2,232 GBP
Retailer 5£2,375 GBP
Retailer 7£2,453 GBP
Retailer 16£2,453 GBP
Retailer 15£2,547 GBP
Retailer 10£2,590 GBP
Retailer 12£2,640 GBP
Retailer 4£2,781 GBP
Retailer 8£2,830 GBP
Retailer 6£2,900 GBP
Retailer 9£3,066 GBP
Retailer 13£3,146 GBP
Retailer 2£3,224 GBP
Retailer 11£3,268 GBP
Retailer 14£4,552 GBP
NZ Jewellers£4,717 GBP

34 data points across 17 retailers

16 retailers£2,590 GBP to £3,224 GBP

Retailer 1
-
£2,177 GBP
Price last confirmed 12 days ago
Retailer 2
-
£2,232 GBP
View
Price last confirmed 14 days ago
Retailer 3
-
£2,375 GBP
View
Price last confirmed 12 days ago
Retailer 4
-
£2,453 GBP
View
Price last confirmed 19 days ago
Retailer 5
-
£2,453 GBP
View
Price last confirmed 13 days ago
Retailer 6
-
£2,464 GBP
View
Price last confirmed 17 days ago
Retailer 7
-
£2,547 GBP
View
Price last confirmed 19 days ago
B
Retailer 8
-
£2,590 GBP
View
Retailer 9
-
£2,781 GBP
View
Price last confirmed 14 days ago
Retailer 10
-
£2,830 GBP
View
Price last confirmed 14 days ago
Retailer 11
-
£2,900 GBP
View
Price last confirmed 27 days ago
Retailer 12
-
£3,066 GBP
View
Price last confirmed 12 days ago
B
Retailer 13
-
£3,224 GBP
View
Retailer 14
-
£3,268 GBP
View
Price last confirmed 13 days ago
Retailer 15
-
£4,552 GBP
View
Price last confirmed 14 days ago
Most Expensive
NZ Jewellers
3217f459-345e-46b9-83f9-6e3898b8c971 · Oct 21
£4,717 GBP
$6,326 USD
View
Price last confirmed 14 days ago
15 more retailers have this diamond
Prices start from £2,590 GBPSave up to £634 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
1.00ct Marquise
£2,590 GBP