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Cushion|Natural|GIA

1.51ct H SI1 Cushion Natural Diamond

ID • H/SI1 • GIA 6565025664

Certificate GIA 6565025664

Diamond specifications and retailer prices

From $4,128 AUD
HK$22,600 HKD
As of November 1, 2026
Save $12,607 AUD (75%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $16,735 AUD at William & Sons Jewelers · As of November 2, 2026
View at William & Sons Jewelers

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 6565025664. Listed at 20 retailers as of November 1, 2026, with prices from $4,128 to $16,735, a $12,607 spread on the same certified stone. William & Sons Jewelers lists it at $16,735. 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
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.2°
Pavilion angle35.9°
OriginNatural
Grading LabGIA
CertificateGIA 6565025664
Dimensions6.77 × 6.44 × 4.39 mm
L/W Ratio1.05
Girdle conditionFaceted
Culet sizeNone
Top View
6.77 mm6.44 mm1.51 ctH / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6565025664
Side View
Table 64.0%Crown 33.2°Girdle: MED-THKPavilion 35.9°Culet: NDepth 68.1%

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 1
Current: $6,242 AUD|Low: $3,937 AUD|High: $21,048 AUD|Avg: $6,714 AUD|+13.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
William & Sons Jewelers
November 2, 2026
Retailer 15$4,128 AUD
Retailer 3$4,245 AUD
Retailer 7$4,252 AUD
Retailer 13$4,349 AUD
Retailer 12$4,389 AUD
Retailer 17$4,466 AUD
Retailer 10$4,796 AUD
Retailer 16$5,282 AUD
Retailer 18$5,579 AUD
Retailer 19$5,579 AUD
Retailer 2$5,765 AUD
Retailer 8$5,835 AUD
Retailer 1$6,242 AUD
Retailer 5$6,353 AUD
Retailer 6$6,426 AUD
Retailer 14$6,464 AUD
Retailer 11$6,569 AUD
Retailer 9$9,197 AUD
Retailer 4$16,488 AUD
William & Sons Jewelers$16,735 AUD

26 data points across 20 retailers

20 retailers$4,128 AUD to $16,735 AUD

A
Cheapest Retailer
-
$4,128 AUD
HK$22,600 HKD
A
Retailer 2
-
$4,245 AUD
$2,975 USD
View
A
Retailer 3
-
$4,349 AUD
$3,048 USD
View
A
Retailer 4
-
$4,389 AUD
$3,076 USD
View
A
Retailer 5
-
$4,466 AUD
$3,130 USD
View
Retailer 6
-
$4,796 AUD
$3,361 USD
View
Price last confirmed 25 days ago
Retailer 7
-
$5,129 AUD
SGD 4,857 SGD
View
Price last confirmed 24 days ago
A
Retailer 8
-
$5,282 AUD
$3,702 USD
View
A
Retailer 9
-
$5,579 AUD
$3,910 USD
View
A
Retailer 10
-
$5,579 AUD
$3,910 USD
View
Retailer 11
-
$5,708 AUD
$4,000 USD
View
Price last confirmed 25 days ago
A
Retailer 12
-
$5,765 AUD
$4,040 USD
View
Retailer 13
-
$5,835 AUD
View
Price last confirmed 24 days ago
A
Retailer 14
-
$6,092 AUD
View
B+
Retailer 15
-
$6,242 AUD
£3,445 GBP
View
A
Retailer 16
-
$6,464 AUD
$4,530 USD
View
Retailer 17
-
$6,569 AUD
ZAR 74,372 ZAR
View
Price last confirmed 33 days ago
Retailer 18
-
$9,197 AUD
£5,075 GBP
View
Price last confirmed 25 days ago
Retailer 19
-
$16,488 AUD
$11,555 USD
View
Price last confirmed 9 days ago
Most Expensive
C
William & Sons Jewelers
cert_6565025664 · Nov 2
$16,735 AUD
$11,728 USD
View
Final sale: no returns
19 more retailers have this diamond
Prices start from $4,128 AUDSave up to $12,607 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
$4,128 AUD