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Cushion|Natural|GIA

1.51ct H SI1 Cushion Natural Diamond

EX • H/SI1 • GIA 6545505052

Certificate GIA 6545505052

Diamond specifications and retailer prices

From $5,414 AUD
$3,794 USD
As of November 2, 2026
Save $5,907 AUD (52%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $11,321 AUD at MOH London · As of November 1, 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 6545505052. Listed at 20 retailers as of November 1, 2026, with prices from $5,414 to $11,321, a $5,907 spread on the same certified stone. MOH London lists it at $11,321. 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
FluorescenceStrong
OriginNatural
Grading LabGIA
CertificateGIA 6545505052
Dimensions6.54 × 6.46 × 4.50 mm
L/W Ratio1.01
Top View
6.54 mm6.46 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 6545505052
Side View
Table 62.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 69.6%

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 2
Current: $11,321 AUD|Low: $5,414 AUD|High: $11,456 AUD|Avg: $7,368 AUD|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 9$5,414 AUD
Retailer 7$5,659 AUD
Retailer 10$6,093 AUD
Retailer 8$6,438 AUD
Retailer 11$6,808 AUD
Retailer 4$7,068 AUD
Retailer 6$7,165 AUD
Retailer 3$7,845 AUD
Retailer 2$8,041 AUD
Retailer 5$8,736 AUD
MOH London$11,321 AUD

43 data points across 11 retailers

20 retailers$5,414 AUD to $11,321 AUD

A
Cheapest Retailer
-
$5,414 AUD
$3,794 USD
A
Retailer 2
-
$5,553 AUD
$3,892 USD
View
A
Retailer 3
-
$5,616 AUD
$3,936 USD
View
A
Retailer 4
-
$5,659 AUD
$3,966 USD
View
Final sale: no returns
A
Retailer 5
-
$5,681 AUD
$3,981 USD
View
A
Retailer 6
-
$6,080 AUD
CA$5,918 CAD
View
A
Retailer 7
-
$6,093 AUD
$4,270 USD
View
A
Retailer 8
-
$6,266 AUD
$4,391 USD
View
B+
Retailer 9
-
$6,438 AUD
$4,512 USD
View
B+
Retailer 10
-
$6,545 AUD
$4,587 USD
View
B+
Retailer 11
-
$6,779 AUD
$4,751 USD
View
B+
Retailer 12
-
$6,808 AUD
$4,771 USD
View
B+
Retailer 13
-
$7,068 AUD
£3,900 GBP
View
Retailer 14
-
$7,165 AUD
View
Price last confirmed 24 days ago
Retailer 15
-
$7,845 AUD
$5,498 USD
View
Price last confirmed 10 days ago
B+
Retailer 16
-
$8,041 AUD
€5,367 EUR
View
B+
Retailer 17
-
$8,182 AUD
$5,734 USD
View
B
Retailer 18
-
$8,736 AUD
ZAR 98,910 ZAR
View
B
Retailer 19
-
$10,286 AUD
$7,209 USD
View
Most Expensive
B
MOH London
8012FE3A7 · Nov 1
$11,321 AUD
£6,247 GBP
View
19 more retailers have this diamond
Prices start from $5,414 AUDSave up to $5,907 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
$5,414 AUD