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Round|Natural|GIA

0.90ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 5566560520

Certificate GIA 5566560520

Diamond specifications and retailer prices

From £865 GBP
As of November 6, 2026
Save £1,901 GBP (69%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £2,824 GBP at NZ Jewellers · As of October 30, 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 5566560520. Listed at 18 retailers as of November 2, 2026, with a 220% 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
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 5566560520
Dimensions6.18 × 6.20 × 3.84 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather
Top View
6.18 mm6.20 mm0.90 ctK / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 5566560520
Side View
Table 58.0%Crown 35.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 62.0%

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: £2,824 GBP|Low: £856 GBP|High: £2,824 GBP|Avg: £1,437 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
Retailer 18
November 2, 2026
Retailer 15£865 GBP
Retailer 13£903 GBP
Retailer 7£1,051 GBP
Retailer 8£1,062 GBP
Retailer 17£1,114 GBP
Retailer 10£1,148 GBP
Retailer 4£1,158 GBP
Retailer 18£1,158 GBP
Retailer 9£1,207 GBP
Retailer 3£1,211 GBP
Retailer 6£1,259 GBP
Retailer 11£1,279 GBP
Retailer 5£1,336 GBP
Retailer 12£1,574 GBP
Retailer 16£1,707 GBP
Retailer 14£2,028 GBP
Retailer 2£2,765 GBP
NZ Jewellers£2,824 GBP

18 data points across 18 retailers

18 retailers£865 GBP to £2,765 GBP

A
Cheapest Retailer
-
£865 GBP
A
Retailer 2
-
£903 GBP
View
B+
Retailer 3
-
£1,051 GBP
View
B+
Retailer 4
-
£1,062 GBP
View
B+
Retailer 5
-
£1,114 GBP
View
B
Retailer 6
-
£1,148 GBP
View
Retailer 7
-
£1,158 GBP
View
Price last confirmed 8 days ago
B
Retailer 8
-
£1,158 GBP
View
Retailer 9
-
£1,207 GBP
View
Price last confirmed 10 days ago
B
Retailer 10
-
£1,211 GBP
View
B
Retailer 11
-
£1,259 GBP
View
B
Retailer 12
-
£1,279 GBP
View
B
Retailer 13
-
£1,336 GBP
View
B
Retailer 14
-
£1,574 GBP
View
B
Retailer 15
-
£1,707 GBP
View
B
Retailer 16
-
£2,028 GBP
View
B
Retailer 17
-
£2,765 GBP
View
Most Expensive
NZ Jewellers
963deaa8-a60e-43fa-abc0-9752fca7d4ab · Oct 30
£2,824 GBP
$3,801 USD
View
Price last confirmed 7 days ago
17 more retailers have this diamond
Prices start from £865 GBPSave up to £1,901 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
£865 GBP