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Cushion|Natural|GIA

1.51ct K SI2 Cushion Natural Diamond

EX • K/SI2 • GIA 5543768687

Certificate GIA 5543768687

Diamond specifications and retailer prices

From $5,335 AUD
As of November 6, 2026
Save $4,779 AUD (47%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $10,114 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 5543768687. Listed at 8 retailers as of November 4, 2026, with prices from $5,335 to $10,114, a $4,779 spread on the same certified stone. MOH London lists it at $10,114. 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
PolishVery Good
SymmetryExcellent
FluorescenceNone
Crown angle33.3°
Pavilion angle37°
OriginNatural
Grading LabGIA
CertificateGIA 5543768687
Dimensions7.91 × 6.00 × 4.06 mm
L/W Ratio1.32
Top View
7.91 mm6.00 mm1.51 ctK / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateGIA 5543768687
Side View
Table 62.0%Crown 33.3°Girdle: STK-VTKPavilion 37°Culet: NoneDepth 67.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $10,114 AUD|Low: $5,335 AUD|High: $11,022 AUD|Avg: $6,983 AUD|-8.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 7$5,335 AUD
Retailer 8$5,560 AUD
Retailer 2$6,041 AUD
Retailer 5$6,063 AUD
Retailer 3$6,145 AUD
Retailer 4$6,279 AUD
Retailer 6$6,461 AUD
MOH London$10,114 AUD

44 data points across 8 retailers

8 retailers$5,335 AUD to $10,114 AUD

B+
Cheapest Retailer
-
$5,335 AUD
B+
Retailer 2
-
$5,560 AUD
View
B+
Retailer 3
-
$6,041 AUD
View
Retailer 4
-
$6,063 AUD
View
Price last confirmed 8 days ago
B+
Retailer 5
-
$6,145 AUD
View
B+
Retailer 6
-
$6,279 AUD
View
B
Retailer 7
-
$6,461 AUD
View
Most Expensive
B
MOH London
59BF3CB5C · Nov 4
$10,114 AUD
£5,472 GBP
View
7 more retailers have this diamond
Prices start from $5,335 AUDSave up to $4,779 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.

B+
1.51ct Cushion
$5,335 AUD