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Round|Natural|GIA

0.90ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 6445689140

Certificate GIA 6445689140

Diamond specifications and retailer prices

From £697 GBP
As of November 5, 2026
Save £1,604 GBP (70%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £2,395 GBP at NZ Jewellers · As of September 25, 2026
View at NZ Jewellers

About this 0.9ct natural round diamond

This 0.9ct natural round sits in the just-under-one-carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6445689140. Listed at 20 retailers as of November 5, 2026, with a 230% 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

0.90
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6445689140
Dimensions6.18 × 6.14 × 3.84 mm
L/W Ratio1.01
Top View
6.18 mm6.14 mm0.90 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6445689140
Side View
Table 57.0%Crown 35.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.3%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £2,301 GBP|Low: £697 GBP|High: £2,301 GBP|Avg: £1,113 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
November 5, 2026
Retailer 10£697 GBP
Retailer 9£842 GBP
Retailer 14£866 GBP
Retailer 3£903 GBP
Retailer 5£910 GBP
Retailer 7£944 GBP
Retailer 17£944 GBP
Retailer 15£979 GBP
Retailer 4£987 GBP
Retailer 16£1,029 GBP
Retailer 6£1,043 GBP
Retailer 12£1,061 GBP
Retailer 8£1,088 GBP
Retailer 2£1,213 GBP
Retailer 11£1,381 GBP
Retailer 13£1,723 GBP
NZ Jewellers£2,301 GBP

32 data points across 17 retailers

20 retailers£697 GBP to £2,301 GBP

A
Cheapest Retailer
-
£697 GBP
A
Retailer 2
-
£842 GBP
View
A
Retailer 3
-
£866 GBP
View
B+
Retailer 4
-
£903 GBP
View
B+
Retailer 5
-
£910 GBP
View
Retailer 6
-
£944 GBP
View
Price last confirmed 8 days ago
B+
Retailer 7
-
£944 GBP
View
B+
Retailer 8
-
£979 GBP
View
Retailer 9
-
£981 GBP
View
Price last confirmed 44 days ago
B+
Retailer 10
-
£987 GBP
View
B+
Retailer 11
-
£1,029 GBP
View
B+
Retailer 12
-
£1,043 GBP
View
B+
Retailer 13
-
£1,061 GBP
View
B+
Retailer 14
-
£1,088 GBP
View
Retailer 15
-
£1,133 GBP
View
Price last confirmed 45 days ago
B
Retailer 16
-
£1,213 GBP
View
B
Retailer 17
-
£1,381 GBP
View
B
Retailer 18
-
£1,723 GBP
View
B
Retailer 19
-
£2,301 GBP
View
Most Expensive
NZ Jewellers
07ab2574-a29e-409b-9c2a-a355e5b43375 · Sep 25
£2,395 GBP
$3,223 USD
View
Price last confirmed 41 days ago
19 more retailers have this diamond
Prices start from £697 GBPSave up to £1,604 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
0.90ct Round
£697 GBP