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Cushion|Natural|GIA

1.51ct K SI2 Cushion Natural Diamond

EX • K/SI2 • GIA 2566006105

Certificate GIA 2566006105

Diamond specifications and retailer prices

From $2,644 AUD
As of November 6, 2026
Save $3,614 AUD (58%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $6,259 AUD at MOH London · As of November 4, 2026
View at MOH London

About this 1.51ct natural cushion diamond

This 1.51ct natural cushion sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2566006105. Listed at 7 retailers as of November 4, 2026, with prices from $2,644 to $6,259, a $3,614 spread on the same certified stone. MOH London lists it at $6,259. 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

1.51
Carat
K
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2566006105
Dimensions7.52 × 5.93 × 4.11 mm
L/W Ratio1.27
Key to symbols
Crystal, Feather, Cloud, Needle
Top View
7.52 mm5.93 mm1.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2566006105
Side View
Table 59.0%CrownGirdle: STK-VTKPavilionCulet: NDepth 69.3%

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: $6,259 AUD|Low: $2,608 AUD|High: $6,351 AUD|Avg: $3,922 AUD|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 6$2,644 AUD
Retailer 7$3,308 AUD
Retailer 3$3,569 AUD
Retailer 5$3,665 AUD
Retailer 2$3,700 AUD
Retailer 4$4,573 AUD
MOH London$6,259 AUD

32 data points across 7 retailers

7 retailers$2,644 AUD to $6,259 AUD

A
Cheapest Retailer
-
$2,644 AUD
B+
Retailer 2
-
$3,308 AUD
View
A
Retailer 3
-
$3,569 AUD
View
B+
Retailer 4
-
$3,665 AUD
View
B+
Retailer 5
-
$3,700 AUD
View
B+
Retailer 6
-
$4,573 AUD
View
Most Expensive
B
MOH London
051E64C1E · Nov 4
$6,259 AUD
£3,386 GBP
View
6 more retailers have this diamond
Prices start from $2,644 AUDSave up to $3,614 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
1.51ct Cushion
$2,644 AUD