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Cushion|Natural|GIA

1.00ct I SI1 Cushion Natural Diamond

EX • I/SI1 • GIA 1428718547

Certificate GIA 1428718547

Diamond specifications and retailer prices

From £765 GBP
As of November 6, 2026
Save £1,123 GBP (59%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,888 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1ct natural cushion diamond

This 1ct natural cushion sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1428718547. Listed at 14 retailers as of November 4, 2026, with prices from £765 to £1,888, a £1,123 spread on the same certified stone. MOH London lists it at £1,888. 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
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceStrong
OriginNatural
Grading LabGIA
CertificateGIA 1428718547
Dimensions5.22 × 5.22 × 4.14 mm
L/W Ratio1.00
Key to symbols
Crystal, Feather, Cloud, Needle, Indented Natural, Natural
Top View
5.22 mm5.22 mm1.00 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceStrong
CertificateGIA 1428718547
Side View
Table 60.0%CrownGirdle: ThickPavilionCulet: NoneDepth 79.3%

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: £1,888 GBP|Low: £765 GBP|High: £1,903 GBP|Avg: £1,198 GBP|-0.8%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 9£765 GBP
Retailer 10£987 GBP
Retailer 2£1,002 GBP
Retailer 8£1,033 GBP
Retailer 5£1,067 GBP
Retailer 3£1,113 GBP
Retailer 6£1,133 GBP
Retailer 7£1,261 GBP
Retailer 11£1,348 GBP
Retailer 4£1,433 GBP
MOH London£1,888 GBP

35 data points across 11 retailers

14 retailers£765 GBP to £1,888 GBP

A
Cheapest Retailer
-
£765 GBP
B+
Retailer 2
-
£958 GBP
View
Retailer 3
-
£967 GBP
View
Price last confirmed 59 days ago
B+
Retailer 4
-
£987 GBP
View
Final sale: no returns
A
Retailer 5
-
£1,002 GBP
View
Retailer 6
-
£1,033 GBP
View
Price last confirmed 9 days ago
B+
Retailer 7
-
£1,067 GBP
View
B+
Retailer 8
-
£1,113 GBP
View
B+
Retailer 9
-
£1,130 GBP
View
B+
Retailer 10
-
£1,133 GBP
View
B+
Retailer 11
-
£1,261 GBP
View
Retailer 12
-
£1,348 GBP
View
Price last confirmed 33 days ago
B+
Retailer 13
-
£1,433 GBP
View
Most Expensive
B
MOH London
B3C613D10 · Nov 4
£1,888 GBP
View
13 more retailers have this diamond
Prices start from £765 GBPSave up to £1,123 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 Cushion
£765 GBP