CaratHunter
Plans
Cushion|Natural|GIA

1.51ct H SI1 Cushion Natural Diamond

EX • H/SI1 • GIA 1553050279

Certificate GIA 1553050279

Diamond specifications and retailer prices

From $4,488 AUD
As of November 6, 2026
Save $5,674 AUD (56%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $10,162 AUD at MOH London · As of November 2, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1553050279. Listed at 10 retailers as of November 2, 2026, with prices from $4,488 to $10,162, a $5,674 spread on the same certified stone. MOH London lists it at $10,162. 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
H
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Pavilion angle36.22°
OriginNatural
Grading LabGIA
CertificateGIA 1553050279
Dimensions7.56 × 5.92 × 4.14 mm
L/W Ratio1.28
Key to symbols
Feather, Crystal, Needle
Top View
7.56 mm5.92 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1553050279
Side View
Table 65.0%CrownGirdle: STK-VTKPavilion 36.22°Culet: NoneDepth 69.9%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $10,162 AUD|Low: $4,488 AUD|High: $10,634 AUD|Avg: $6,543 AUD|-4.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 6$4,488 AUD
Retailer 5$5,269 AUD
Retailer 8$5,497 AUD
Retailer 4$5,663 AUD
Retailer 2$5,695 AUD
Retailer 9$6,282 AUD
Retailer 7$6,495 AUD
Retailer 3$7,053 AUD
MOH London$10,162 AUD

34 data points across 9 retailers

10 retailers$4,488 AUD to $10,162 AUD

A
Cheapest Retailer
-
$4,488 AUD
A
Retailer 2
-
$5,269 AUD
View
A
Retailer 3
-
$5,497 AUD
View
A
Retailer 4
-
$5,663 AUD
View
A
Retailer 5
-
$5,695 AUD
View
A
Retailer 6
-
$6,282 AUD
View
Final sale: no returns
A
Retailer 7
-
$6,495 AUD
View
B+
Retailer 8
-
$6,648 AUD
View
B+
Retailer 9
-
$7,053 AUD
View
Most Expensive
B
MOH London
3EE8400D9 · Nov 2
$10,162 AUD
£5,498 GBP
View
9 more retailers have this diamond
Prices start from $4,488 AUDSave up to $5,674 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
$4,488 AUD