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Round|Natural|GIA

1.00ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 5406598535

Certificate GIA 5406598535

Diamond specifications and retailer prices

From £1,826 GBP
As of October 31, 2026
Save £3,202 GBP (64%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £5,027 GBP at Diamond Quarter · As of November 5, 2026
View at Diamond Quarter

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5406598535. Listed at 21 retailers as of October 31, 2026, with prices from £1,826 to £5,027, a £3,202 spread on the same certified stone. Diamond Quarter lists it at £5,027. 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
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
Crown angle32.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 5406598535
Dimensions6.54 × 6.52 × 3.88 mm
L/W Ratio1.00
Top View
6.54 mm6.52 mm1.00 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 5406598535
Side View
Table 58.0%Crown 32.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 59.4%

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: £2,427 GBP|Low: £1,821 GBP|High: £4,439 GBP|Avg: £2,638 GBP|-1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 12£1,826 GBP
Retailer 2£1,855 GBP
Retailer 10£2,288 GBP
Retailer 3£2,307 GBP
Retailer 4£2,340 GBP
Retailer 1£2,427 GBP
Retailer 5£2,575 GBP
Retailer 6£2,608 GBP
Retailer 11£2,662 GBP
Retailer 7£3,095 GBP
Retailer 8£4,229 GBP
Retailer 9£4,439 GBP

29 data points across 12 retailers

21 retailers£1,826 GBP to £5,027 GBP

A
Cheapest Retailer
-
£1,826 GBP
A
Retailer 2
-
£1,855 GBP
View
A
Retailer 3
-
£2,187 GBP
View
A
Retailer 4
-
£2,288 GBP
View
B+
Retailer 5
-
£2,307 GBP
View
B+
Retailer 6
-
£2,340 GBP
View
Final sale: no returns
B+
Retailer 7
-
£2,427 GBP
View
B+
Retailer 8
-
£2,536 GBP
View
Retailer 9
-
£2,536 GBP
View
Price last confirmed 8 days ago
B+
Retailer 10
-
£2,575 GBP
View
B+
Retailer 11
-
£2,608 GBP
View
B+
Retailer 12
-
£2,633 GBP
View
B+
Retailer 13
-
£2,662 GBP
View
Retailer 14
-
£2,719 GBP
View
Price last confirmed 33 days ago
B+
Retailer 15
-
£2,926 GBP
View
B+
Retailer 16
-
£3,095 GBP
View
B
Retailer 17
-
£4,229 GBP
View
B
Retailer 18
-
£4,418 GBP
View
B
Retailer 19
-
£4,439 GBP
View
B
Retailer 20
-
£4,690 GBP
View
Most Expensive
B
Diamond Quarter
1.0SI1D5435FF5FN · Nov 5
£5,027 GBP
View
20 more retailers have this diamond
Prices start from £1,826 GBPSave up to £3,202 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 Round
£1,826 GBP