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Cushion|Natural|GIA

0.90ct K SI1 Cushion Natural Diamond

EX • K/SI1 • GIA 6285677170

Certificate GIA 6285677170

Diamond specifications and retailer prices

From £403 GBP
As of November 6, 2026
Save £1,379 GBP (77%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £1,782 GBP at Adiamor · As of November 5, 2026
View at Adiamor

About this 0.9ct natural cushion diamond

This 0.9ct natural cushion sits in the just-under-one-carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6285677170. Listed at 16 retailers as of November 5, 2026, with prices from £403 to £1,782, a £1,379 spread on the same certified stone. Adiamor lists it at £1,782. 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 (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 6285677170
Dimensions5.26 × 5.21 × 3.84 mm
L/W Ratio1.01
Top View
5.26 mm5.21 mm0.90 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 6285677170
Side View
Table 54.0%CrownGirdle: THK-THKPavilionCulet: NoneDepth 73.7%

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 6
Current: £403 GBP|Low: £403 GBP|High: £1,157 GBP|Avg: £753 GBP|-4.1%
Retailer 1
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
November 6, 2026
Retailer 1£403 GBP
Retailer 2£430 GBP
Retailer 7£586 GBP
Retailer 4£591 GBP
Retailer 10£593 GBP
Retailer 14£599 GBP
Retailer 6£641 GBP
Retailer 15£663 GBP
Retailer 5£668 GBP
Retailer 11£703 GBP
Retailer 3£717 GBP
Retailer 9£830 GBP
Retailer 12£865 GBP
Retailer 13£1,080 GBP
Retailer 8£1,130 GBP

25 data points across 15 retailers

16 retailers£403 GBP to £1,782 GBP

A
Cheapest Retailer
-
£403 GBP
A
Retailer 2
-
£430 GBP
View
B+
Retailer 3
-
£586 GBP
View
Retailer 4
-
£591 GBP
View
Price last confirmed 9 days ago
B+
Retailer 5
-
£593 GBP
View
B+
Retailer 6
-
£599 GBP
View
B+
Retailer 7
-
£641 GBP
View
B+
Retailer 8
-
£663 GBP
View
B+
Retailer 9
-
£668 GBP
View
B+
Retailer 10
-
£703 GBP
View
B+
Retailer 11
-
£717 GBP
View
B+
Retailer 12
-
£830 GBP
View
B+
Retailer 13
-
£865 GBP
View
B
Retailer 14
-
£1,080 GBP
View
B
Retailer 15
-
£1,130 GBP
View
Most Expensive
B
Adiamor
D-51268865 · Nov 5
£1,782 GBP
$2,385 USD
View
15 more retailers have this diamond
Prices start from £403 GBPSave up to £1,379 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 Cushion
£403 GBP