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Round|Natural|GIA

1.02ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 1559589355

Certificate GIA 1559589355

Diamond specifications and retailer prices

From £1,259 GBP
As of November 6, 2026
Save £941 GBP (43%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £3,072 GBP at NZ Jewellers · As of October 3, 2026
View at NZ Jewellers

About this 1.02ct natural round diamond

This 1.02ct 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 1559589355. Listed at 11 retailers as of November 4, 2026, with a 75% 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

1.02
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1559589355
Dimensions6.43 × 6.41 × 4.01 mm
L/W Ratio1.00
Star length50%
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Needle
Top View
6.43 mm6.41 mm1.02 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1559589355
Side View
Table 57.0%Crown 35.5°Girdle: THN-STKPavilion 41°Culet: NoneDepth 62.5%

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 6
Current: £1,389 GBP|Low: £1,259 GBP|High: £2,326 GBP|Avg: £1,626 GBP|-0.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 6£1,259 GBP
Retailer 1£1,389 GBP
Retailer 2£1,500 GBP
Retailer 4£1,537 GBP
Retailer 3£1,707 GBP
Retailer 5£2,201 GBP

44 data points across 6 retailers

11 retailers£1,259 GBP to £2,201 GBP

A
Cheapest Retailer
-
£1,259 GBP
Retailer 2
-
£1,259 GBP
View
Price last confirmed 29 days ago
Retailer 3
-
£1,259 GBP
View
Price last confirmed 29 days ago
Retailer 4
-
£1,373 GBP
View
Price last confirmed 38 days ago
B+
Retailer 5
-
£1,389 GBP
View
Retailer 6
-
£1,453 GBP
View
Price last confirmed 35 days ago
B+
Retailer 7
-
£1,500 GBP
View
B+
Retailer 8
-
£1,537 GBP
View
B+
Retailer 9
-
£1,707 GBP
View
B
Retailer 10
-
£2,201 GBP
View
Most Expensive
NZ Jewellers
d6bcc7c3-6a43-473f-a499-0316827d6bd6 · Oct 3
£3,072 GBP
$4,135 USD
View
Price last confirmed 34 days ago
10 more retailers have this diamond
Prices start from £1,259 GBPSave up to £941 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
1.02ct Round
£1,259 GBP