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Round|Natural|GIA

1.00ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2566189059

Certificate GIA 2566189059

Diamond specifications and retailer prices

From £1,825 GBP
$2,445 USD
As of October 30, 2026
Save £2,877 GBP (61%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £4,702 GBP at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2566189059. Listed at 22 retailers as of October 30, 2026, with prices from £1,825 to £4,702, a £2,877 spread on the same certified stone. NZ Jewellers lists it at £4,702. 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

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle33°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 2566189059
Dimensions6.41 × 6.44 × 3.96 mm
L/W Ratio1.00
Culet sizeNone
Top View
6.41 mm6.44 mm1.00 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 2566189059
Side View
Table 59.0%Crown 33°Girdle: THN-STKPavilion 41.6°Culet: NoneDepth 61.6%

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: Oct 30
Current: £4,702 GBP|Low: £1,460 GBP|High: £4,702 GBP|Avg: £2,126 GBP
NZ Jewellers
Retailer 2
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Retailer 27
October 31, 2026
Retailer 10£1,460 GBP
Retailer 16£1,543 GBP
Retailer 12£1,586 GBP
Retailer 8£1,605 GBP
Retailer 19£1,726 GBP
Retailer 3£1,825 GBP
Retailer 14£1,879 GBP
Retailer 5£1,884 GBP
Retailer 9£1,988 GBP
Retailer 18£1,989 GBP
Retailer 4£2,004 GBP
Retailer 11£2,009 GBP
Retailer 25£2,037 GBP
Retailer 27£2,037 GBP
Retailer 26£2,116 GBP
Retailer 21£2,170 GBP
Retailer 6£2,311 GBP
Retailer 7£2,351 GBP
Retailer 22£2,390 GBP
Retailer 20£2,460 GBP
Retailer 15£2,588 GBP
Retailer 23£2,611 GBP
Retailer 13£2,634 GBP
Retailer 2£2,764 GBP
Retailer 17£2,841 GBP
Retailer 24£3,781 GBP
NZ Jewellers£4,702 GBP

27 data points across 27 retailers

22 retailers£1,825 GBP to £4,702 GBP

Retailer 1
-
£1,586 GBP
$2,124 USD
Price last confirmed 17 days ago
Retailer 2
-
£1,605 GBP
$2,150 USD
View
Price last confirmed 17 days ago
Retailer 3
-
£1,726 GBP
SGD 3,125 SGD
View
Price last confirmed 17 days ago
B+
Retailer 4
-
£1,825 GBP
$2,445 USD
View
B+
Retailer 5
-
£1,870 GBP
$2,505 USD
View
B+
Retailer 6
-
£1,884 GBP
$2,525 USD
View
B+
Retailer 7
-
£2,004 GBP
$2,685 USD
View
Retailer 8
-
£2,009 GBP
View
Price last confirmed 15 days ago
B+
Retailer 9
-
£2,037 GBP
$2,730 USD
View
B+
Retailer 10
-
£2,037 GBP
$2,730 USD
View
B+
Retailer 11
-
£2,116 GBP
$2,835 USD
View
B+
Retailer 12
-
£2,170 GBP
View
B
Retailer 13
-
£2,311 GBP
$3,096 USD
View
B
Retailer 14
-
£2,350 GBP
$3,149 USD
View
B
Retailer 15
-
£2,351 GBP
$3,150 USD
View
B
Retailer 16
-
£2,390 GBP
View
Retailer 17
-
£2,588 GBP
$3,467 USD
View
Price last confirmed 17 days ago
B
Retailer 18
-
£2,634 GBP
€3,361 EUR
View
B
Retailer 19
-
£2,764 GBP
ZAR 59,837 ZAR
View
Retailer 20
-
£2,841 GBP
$3,806 USD
View
Price last confirmed 16 days ago
B
Retailer 21
-
£3,781 GBP
View
Most Expensive
B
NZ Jewellers
6443b987-1d38-4d76-b20b-560ff4338924 · Oct 30
£4,702 GBP
$6,300 USD
View
21 more retailers have this diamond
Prices start from £1,825 GBPSave up to £2,877 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
£1,825 GBP