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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 $1,490 AUD
As of November 6, 2026
Save $2,188 AUD (59%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $3,678 AUD 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 $1,490 to $3,678, a $2,188 spread on the same certified stone. MOH London lists it at $3,678. 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: $3,678 AUD|Low: $1,490 AUD|High: $3,708 AUD|Avg: $2,335 AUD|-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$1,490 AUD
Retailer 10$1,923 AUD
Retailer 2$1,952 AUD
Retailer 8$2,013 AUD
Retailer 5$2,078 AUD
Retailer 3$2,169 AUD
Retailer 6$2,208 AUD
Retailer 7$2,457 AUD
Retailer 11$2,626 AUD
Retailer 4$2,791 AUD
MOH London$3,678 AUD

35 data points across 11 retailers

14 retailers$1,490 AUD to $3,678 AUD

A
Cheapest Retailer
-
$1,490 AUD
B+
Retailer 2
-
$1,866 AUD
View
Retailer 3
-
$1,883 AUD
View
Price last confirmed 59 days ago
B+
Retailer 4
-
$1,923 AUD
View
Final sale: no returns
A
Retailer 5
-
$1,952 AUD
View
Retailer 6
-
$2,013 AUD
View
Price last confirmed 9 days ago
B+
Retailer 7
-
$2,078 AUD
View
B+
Retailer 8
-
$2,169 AUD
View
B+
Retailer 9
-
$2,202 AUD
View
B+
Retailer 10
-
$2,208 AUD
View
B+
Retailer 11
-
$2,457 AUD
View
Retailer 12
-
$2,626 AUD
View
Price last confirmed 33 days ago
B+
Retailer 13
-
$2,791 AUD
View
Most Expensive
B
MOH London
B3C613D10 · Nov 4
$3,678 AUD
£1,990 GBP
View
13 more retailers have this diamond
Prices start from $1,490 AUDSave up to $2,188 AUD

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
$1,490 AUD