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Cushion|Natural|GIA

1.51ct K SI1 Cushion Natural Diamond

GD • K/SI1 • GIA 6445506666

Certificate GIA 6445506666

Diamond specifications and retailer prices

From $3,304 AUD
As of November 4, 2026
Save $3,679 AUD (53%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $6,983 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 standard cut grade stated by the retailer rather than the lab and certified by GIA 6445506666. Listed at 15 retailers as of November 4, 2026, with prices from $3,304 to $6,983, a $3,679 spread on the same certified stone. MOH London lists it at $6,983. 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
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishVery Good
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6445506666
Dimensions6.60 × 5.95 × 4.24 mm
L/W Ratio1.11
Top View
6.60 mm5.95 mm1.51 ctK / SI1
OriginNatural
CutGood
PolishVery Good
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6445506666
Side View
Table 66.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 71.2%

Caratlytics Score

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

Price History

Last verified: Nov 4
Current: $6,983 AUD|Low: $3,304 AUD|High: $7,077 AUD|Avg: $4,487 AUD|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 7, 2026
Retailer 6$3,304 AUD
Retailer 7$3,579 AUD
Retailer 8$3,793 AUD
Retailer 3$4,023 AUD
Retailer 2$4,443 AUD
Retailer 4$4,826 AUD
Retailer 5$5,110 AUD
MOH London$6,983 AUD

38 data points across 8 retailers

15 retailers$3,304 AUD to $6,983 AUD

B+
Cheapest Retailer
-
$3,304 AUD
B+
Retailer 2
-
$3,398 AUD
View
B+
Retailer 3
-
$3,579 AUD
View
B+
Retailer 4
-
$3,748 AUD
View
Retailer 5
-
$3,793 AUD
View
Price last confirmed 9 days ago
B+
Retailer 6
-
$3,850 AUD
View
B+
Retailer 7
-
$3,864 AUD
View
B+
Retailer 8
-
$4,023 AUD
View
B+
Retailer 9
-
$4,088 AUD
View
B+
Retailer 10
-
$4,119 AUD
View
B+
Retailer 11
-
$4,443 AUD
View
B+
Retailer 12
-
$4,826 AUD
View
Retailer 13
-
$4,862 AUD
View
Price last confirmed 15 days ago
B+
Retailer 14
-
$5,110 AUD
View
Most Expensive
B
MOH London
6ED3F1AE5 · Nov 4
$6,983 AUD
£3,778 GBP
View
14 more retailers have this diamond
Prices start from $3,304 AUDSave up to $3,679 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
$3,304 AUD