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Cushion|Natural|GIA

1.51ct K SI1 Cushion Natural Diamond

EX • K/SI1 • GIA 3555303625

Certificate GIA 3555303625

Diamond specifications and retailer prices

From $3,940 AUD
As of November 5, 2026
Save $4,696 AUD (54%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $8,636 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 SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 3555303625. Listed at 14 retailers as of November 4, 2026, with prices from $3,940 to $8,636, a $4,696 spread on the same certified stone. MOH London lists it at $8,636. 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
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 3555303625
Dimensions7.82 × 6.01 × 4.00 mm
L/W Ratio1.30
Girdle conditionFaceted
Top View
7.82 mm6.01 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 3555303625
Side View
Table 65.0%CrownGirdle: ThickPavilionCulet: NoneDepth 66.6%

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 5
Current: $8,636 AUD|Low: $3,940 AUD|High: $9,149 AUD|Avg: $5,473 AUD|-5.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 7, 2026
Retailer 5$3,940 AUD
Retailer 3$3,986 AUD
Retailer 8$4,237 AUD
Retailer 10$4,314 AUD
Retailer 9$4,330 AUD
Retailer 12$4,548 AUD
Retailer 4$4,835 AUD
Retailer 13$5,319 AUD
Retailer 2$5,357 AUD
Retailer 6$6,028 AUD
Retailer 7$6,319 AUD
Retailer 11$8,155 AUD
MOH London$8,636 AUD

34 data points across 13 retailers

14 retailers$3,940 AUD to $8,636 AUD

A
Cheapest Retailer
-
$3,940 AUD
A
Retailer 2
-
$3,986 AUD
View
A
Retailer 3
-
$4,237 AUD
View
A
Retailer 4
-
$4,314 AUD
View
A
Retailer 5
-
$4,330 AUD
View
Final sale: no returns
A
Retailer 6
-
$4,548 AUD
View
A
Retailer 7
-
$4,835 AUD
View
B+
Retailer 8
-
$5,319 AUD
View
B+
Retailer 9
-
$5,357 AUD
View
B+
Retailer 10
-
$5,400 AUD
View
B+
Retailer 11
-
$6,028 AUD
View
B+
Retailer 12
-
$6,319 AUD
View
B
Retailer 13
-
$8,155 AUD
View
Most Expensive
B
MOH London
A225B3F8E · Nov 4
$8,636 AUD
£4,672 GBP
View
13 more retailers have this diamond
Prices start from $3,940 AUDSave up to $4,696 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
$3,940 AUD