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Cushion|Natural|GIA

1.80ct K SI1 Cushion Natural Diamond

EX • K/SI1 • GIA 1232955452

Certificate GIA 1232955452

Diamond specifications and retailer prices

From $3,540 AUD
As of November 6, 2026
Save $4,468 AUD (56%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $8,007 AUD at MOH London · As of November 4, 2026
View at MOH London

About this 1.8ct natural cushion diamond

This 1.8ct natural cushion sits in the one-and-a-half to two 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 1232955452. Listed at 8 retailers as of November 4, 2026, with prices from $3,540 to $8,007, a $4,468 spread on the same certified stone. MOH London lists it at $8,007. 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

1.80
Carat
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Pavilion angle35.99°
OriginNatural
Grading LabGIA
CertificateGIA 1232955452
Dimensions8.05 × 6.31 × 4.33 mm
L/W Ratio1.28
Key to symbols
Crystal, Feather, Cavity, Needle
Top View
8.05 mm6.31 mm1.80 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1232955452
Side View
Table 62.0%CrownGirdle: STK-VTKPavilion 35.99°Culet: NoneDepth 68.6%

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: $8,007 AUD|Low: $3,540 AUD|High: $8,918 AUD|Avg: $5,450 AUD|-10.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 5$3,540 AUD
Retailer 7$4,417 AUD
Retailer 2$4,657 AUD
Retailer 4$4,928 AUD
Retailer 6$5,187 AUD
Retailer 8$5,286 AUD
Retailer 3$5,727 AUD
MOH London$8,007 AUD

39 data points across 8 retailers

8 retailers$3,540 AUD to $8,007 AUD

A
Cheapest Retailer
-
$3,540 AUD
A
Retailer 2
-
$4,417 AUD
View
A
Retailer 3
-
$4,657 AUD
View
A
Retailer 4
-
$4,928 AUD
View
A
Retailer 5
-
$5,187 AUD
View
B+
Retailer 6
-
$5,286 AUD
View
A
Retailer 7
-
$5,727 AUD
View
Most Expensive
B
MOH London
CA5457909 · Nov 4
$8,007 AUD
£4,332 GBP
View
7 more retailers have this diamond
Prices start from $3,540 AUDSave up to $4,468 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
1.80ct Cushion
$3,540 AUD