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Cushion|Natural|GIA

1.51ct K SI1 Cushion Natural Diamond

VG • K/SI1 • GIA 2528970528

Certificate GIA 2528970528

Diamond specifications and retailer prices

From $3,311 AUD
As of November 5, 2026
Save $3,848 AUD (54%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $7,159 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 very-good cut grade stated by the retailer rather than the lab and certified by GIA 2528970528. Listed at 12 retailers as of November 4, 2026, with prices from $3,311 to $7,159, a $3,848 spread on the same certified stone. MOH London lists it at $7,159. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.51
Carat
K
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle37°
Pavilion angle39.4°
OriginNatural
Grading LabGIA
CertificateGIA 2528970528
Dimensions6.59 × 6.55 × 4.45 mm
L/W Ratio1.01
Top View
6.59 mm6.55 mm1.51 ctK / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2528970528
Side View
Table 61.0%Crown 37°Girdle: MED-THKPavilion 39.4°Culet: NoneDepth 67.9%

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: $7,159 AUD|Low: $3,311 AUD|High: $7,255 AUD|Avg: $4,496 AUD|+0.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 7, 2026
Retailer 4$3,311 AUD
Retailer 7$3,430 AUD
Retailer 12$3,669 AUD
Retailer 5$3,973 AUD
Retailer 9$4,017 AUD
Retailer 8$4,097 AUD
Retailer 3$4,302 AUD
Retailer 2$4,336 AUD
Retailer 10$4,443 AUD
Retailer 11$4,483 AUD
Retailer 6$4,999 AUD
MOH London$7,159 AUD

43 data points across 12 retailers

12 retailers$3,311 AUD to $7,159 AUD

A
Cheapest Retailer
-
$3,311 AUD
A
Retailer 2
-
$3,430 AUD
View
A
Retailer 3
-
$3,669 AUD
View
A
Retailer 4
-
$3,973 AUD
View
B+
Retailer 5
-
$4,017 AUD
View
Retailer 6
-
$4,097 AUD
View
Price last confirmed 13 days ago
B+
Retailer 7
-
$4,302 AUD
View
A
Retailer 8
-
$4,336 AUD
View
B+
Retailer 9
-
$4,443 AUD
View
B+
Retailer 10
-
$4,483 AUD
View
B+
Retailer 11
-
$4,999 AUD
View
Most Expensive
B
MOH London
34FD10842 · Nov 4
$7,159 AUD
£3,873 GBP
View
11 more retailers have this diamond
Prices start from $3,311 AUDSave up to $3,848 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
$3,311 AUD