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Marquise|Natural|GIA

1.00ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 2556641575

Certificate GIA 2556641575

Diamond specifications and retailer prices

From £1,278 GBP
As of November 3, 2026
Save £1,022 GBP (44%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £2,469 GBP at Wholesale Diamonds Direct · As of October 27, 2026
View at Wholesale Diamonds Direct

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 2556641575. Listed at 13 retailers as of November 1, 2026, with a 80% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
SymmetryExcellent
FluorescenceNone
Crown angle39.94°
Pavilion angle40.11°
OriginNatural
Grading LabGIA
CertificateGIA 2556641575
Dimensions9.80 × 5.19 × 3.33 mm
L/W Ratio1.89
Culet sizeNone
Top View
9.80 mm5.19 mm1.00 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2556641575
Side View
Table 58.0%Crown 39.94°Girdle: STK-THKPavilion 40.11°Culet: NoneDepth 64.3%

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 3
Current: £1,278 GBP|Low: £1,273 GBP|High: £2,518 GBP|Avg: £1,835 GBP|-3.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Wholesale Diamonds Direct
November 3, 2026
Retailer 1£1,278 GBP
Retailer 9£1,496 GBP
Retailer 8£1,508 GBP
Retailer 7£1,522 GBP
Retailer 3£1,642 GBP
Retailer 5£1,651 GBP
Retailer 11£1,792 GBP
Retailer 6£1,893 GBP
Retailer 2£1,908 GBP
Retailer 4£2,124 GBP
Retailer 10£2,300 GBP
Wholesale Diamonds Direct£2,469 GBP

38 data points across 12 retailers

13 retailers£1,278 GBP to £2,300 GBP

A
Cheapest Retailer
-
£1,278 GBP
A
Retailer 2
-
£1,496 GBP
View
A
Retailer 3
-
£1,508 GBP
View
A
Retailer 4
-
£1,522 GBP
View
A
Retailer 5
-
£1,642 GBP
View
A
Retailer 6
-
£1,651 GBP
View
A
Retailer 7
-
£1,792 GBP
View
A
Retailer 8
-
£1,893 GBP
View
B+
Retailer 9
-
£1,895 GBP
View
B+
Retailer 10
-
£1,908 GBP
View
B+
Retailer 11
-
£2,124 GBP
View
B+
Retailer 12
-
£2,300 GBP
View
Most Expensive
Wholesale Diamonds Direct
610445789 · Oct 27
£2,469 GBP
$3,312 USD
View
Price last confirmed 8 days ago
12 more retailers have this diamond
Prices start from £1,278 GBPSave up to £1,022 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
1.00ct Marquise
£1,278 GBP