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Round|Natural|GIA

1.00ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 1559065480

Certificate GIA 1559065480

Diamond specifications and retailer prices

From £989 GBP
As of November 4, 2026
Save £1,308 GBP (57%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £3,230 GBP at NZ Jewellers · As of September 28, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1559065480. Listed at 20 retailers as of November 2, 2026, with a 132% 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
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle34.5°
Pavilion angle41.8°
OriginNatural
Grading LabGIA
CertificateGIA 1559065480
Dimensions6.33 × 6.38 × 4.01 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Cavity, Needle, Indented Natural, Natural
Top View
6.33 mm6.38 mm1.00 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1559065480
Side View
Table 58.0%Crown 34.5°Girdle: THN-STKPavilion 41.8°Culet: NoneDepth 63.1%

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 4
Current: £1,071 GBP|Low: £989 GBP|High: £2,347 GBP|Avg: £1,458 GBP|-0.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 5, 2026
Retailer 9£989 GBP
Retailer 7£1,044 GBP
Retailer 1£1,071 GBP
Retailer 4£1,261 GBP
Retailer 11£1,279 GBP
Retailer 3£1,323 GBP
Retailer 2£1,412 GBP
Retailer 5£1,449 GBP
Retailer 10£1,596 GBP
Retailer 6£1,782 GBP
Retailer 8£2,297 GBP

28 data points across 11 retailers

20 retailers£989 GBP to £2,297 GBP

A
Cheapest Retailer
-
£989 GBP
A
Retailer 2
-
£1,044 GBP
View
A
Retailer 3
-
£1,071 GBP
View
B+
Retailer 4
-
£1,247 GBP
View
B+
Retailer 5
-
£1,248 GBP
View
A
Retailer 6
-
£1,261 GBP
View
B+
Retailer 7
-
£1,279 GBP
View
B+
Retailer 8
-
£1,323 GBP
View
Retailer 9
-
£1,324 GBP
View
Price last confirmed 39 days ago
Retailer 10
-
£1,324 GBP
View
Price last confirmed 36 days ago
Retailer 11
-
£1,379 GBP
View
Price last confirmed 10 days ago
Retailer 12
-
£1,386 GBP
View
Price last confirmed 38 days ago
B+
Retailer 13
-
£1,412 GBP
View
B+
Retailer 14
-
£1,449 GBP
View
Retailer 15
-
£1,528 GBP
View
Price last confirmed 39 days ago
Retailer 16
-
£1,528 GBP
View
Price last confirmed 38 days ago
Retailer 17
-
£1,596 GBP
View
Price last confirmed 11 days ago
B
Retailer 18
-
£1,782 GBP
View
B
Retailer 19
-
£2,297 GBP
View
Most Expensive
NZ Jewellers
5a5dec67-3276-44b6-9378-734f69422a74 · Sep 28
£3,230 GBP
$4,347 USD
View
Price last confirmed 39 days ago
19 more retailers have this diamond
Prices start from £989 GBPSave up to £1,308 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
£989 GBP