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Cushion|Natural|GIA

1.51ct J SI1 Cushion Natural Diamond

EX • J/SI1 • GIA 6551130924

Certificate GIA 6551130924

Diamond specifications and retailer prices

From $3,266 AUD
As of November 5, 2026
Save $2,681 AUD (45%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $5,947 AUD at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.51ct natural cushion diamond

This 1.51ct natural cushion sits in the one-and-a-half to two carat band, graded J 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 6551130924. Listed at 12 retailers as of November 5, 2026, with prices from $3,266 to $5,947, a $2,681 spread on the same certified stone. Helzberg Diamonds lists it at $5,947. 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
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6551130924
Dimensions6.85 × 6.09 × 4.22 mm
L/W Ratio1.12
Top View
6.85 mm6.09 mm1.51 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551130924
Side View
Table 61.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 69.3%

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: $5,947 AUD|Low: $3,247 AUD|High: $6,315 AUD|Avg: $4,329 AUD|-5.8%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 6, 2026
Retailer 8$3,266 AUD
Retailer 2$3,398 AUD
Retailer 9$3,457 AUD
Retailer 5$3,647 AUD
Retailer 7$3,698 AUD
Retailer 3$3,762 AUD
Retailer 4$3,940 AUD
Retailer 12$4,071 AUD
Retailer 13$4,259 AUD
Retailer 6$4,876 AUD
Retailer 10$5,269 AUD
Retailer 11$5,884 AUD
Helzberg Diamonds$5,947 AUD

32 data points across 13 retailers

12 retailers$3,266 AUD to $5,947 AUD

A
Cheapest Retailer
-
$3,266 AUD
A
Retailer 2
-
$3,398 AUD
View
A
Retailer 3
-
$3,457 AUD
View
A
Retailer 4
-
$3,698 AUD
View
A
Retailer 5
-
$3,762 AUD
View
A
Retailer 6
-
$3,940 AUD
View
A
Retailer 7
-
$4,071 AUD
View
A
Retailer 8
-
$4,259 AUD
View
A
Retailer 9
-
$4,876 AUD
View
B+
Retailer 10
-
$5,269 AUD
View
B+
Retailer 11
-
$5,884 AUD
View
Most Expensive
B+
Helzberg Diamonds
XZRMLLHHJGPIK · Nov 6
$5,947 AUD
$4,086 USD
View
11 more retailers have this diamond
Prices start from $3,266 AUDSave up to $2,681 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
$3,266 AUD