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Round|Natural|GIA

1.00ct F SI1 Round Natural Diamond

EX • F/SI1 • GIA 6441821726

Certificate GIA 6441821726

Diamond specifications and retailer prices

From £2,427 GBP
As of November 6, 2026
Save £2,694 GBP (53%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £5,603 GBP at NZ Jewellers · As of October 20, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6441821726. Listed at 22 retailers as of November 2, 2026, with a 111% 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
F
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle33°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 6441821726
Dimensions6.47 × 6.43 × 3.86 mm
L/W Ratio1.01
Star length50%
Top View
6.47 mm6.43 mm1.00 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6441821726
Side View
Table 62.0%Crown 33°Girdle: MED-STKPavilion 41°Culet: NoneDepth 60.0%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £3,218 GBP|Low: £2,325 GBP|High: £5,183 GBP|Avg: £3,270 GBP|-0.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 2£2,427 GBP
Retailer 8£2,510 GBP
Retailer 7£2,564 GBP
Retailer 9£2,689 GBP
Retailer 1£3,218 GBP
Retailer 6£3,304 GBP
Retailer 4£3,402 GBP
Retailer 10£3,430 GBP
Retailer 3£3,925 GBP
Retailer 5£5,121 GBP

42 data points across 10 retailers

22 retailers£2,427 GBP to £5,121 GBP

B+
Cheapest Retailer
-
£2,427 GBP
B+
Retailer 2
-
£2,510 GBP
View
B+
Retailer 3
-
£2,513 GBP
View
B+
Retailer 4
-
£2,564 GBP
View
B
Retailer 5
-
£2,689 GBP
View
Final sale: no returns
B+
Retailer 6
-
£2,783 GBP
View
B+
Retailer 7
-
£2,908 GBP
View
Retailer 8
-
£2,913 GBP
View
Price last confirmed 21 days ago
Retailer 9
-
£2,913 GBP
View
Price last confirmed 17 days ago
Retailer 10
-
£3,025 GBP
View
Price last confirmed 22 days ago
B+
Retailer 11
-
£3,218 GBP
View
B
Retailer 12
-
£3,287 GBP
View
B
Retailer 13
-
£3,287 GBP
View
B
Retailer 14
-
£3,304 GBP
View
Retailer 15
-
£3,361 GBP
View
Price last confirmed 19 days ago
B
Retailer 16
-
£3,399 GBP
View
B
Retailer 17
-
£3,402 GBP
View
Retailer 18
-
£3,430 GBP
View
Price last confirmed 28 days ago
Retailer 19
-
£3,638 GBP
View
Price last confirmed 14 days ago
B
Retailer 20
-
£3,925 GBP
View
B
Retailer 21
-
£5,121 GBP
View
Most Expensive
NZ Jewellers
eca354b8-503c-4be2-9e95-23624b3afd7e · Oct 20
£5,603 GBP
$7,499 USD
View
Price last confirmed 17 days ago
21 more retailers have this diamond
Prices start from £2,427 GBPSave up to £2,694 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 Round
£2,427 GBP