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Cushion|Natural|GIA

1.51ct D SI1 Cushion Natural Diamond

EX • D/SI1 • GIA 2557637224

Certificate GIA 2557637224

Diamond specifications and retailer prices

From $5,521 AUD
HK$30,300 HKD
As of November 1, 2026
Save $15,306 AUD (73%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $21,304 AUD at RockHer · As of October 24, 2026
View at RockHer

About this 1.51ct natural cushion diamond

This 1.51ct natural cushion sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2557637224. Listed at 19 retailers as of October 31, 2026, with a 277% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.6°
Pavilion angle36°
OriginNatural
Grading LabGIA
CertificateGIA 2557637224
Dimensions6.63 × 6.44 × 4.40 mm
L/W Ratio1.03
Girdle conditionFaceted
Top View
6.63 mm6.44 mm1.51 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557637224
Side View
Table 63.0%Crown 33.6°Girdle: THN-THKPavilion 36°Culet: NoneDepth 68.3%

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 1
Current: $8,145 AUD|Low: $5,467 AUD|High: $25,853 AUD|Avg: $8,570 AUD|+7.7%
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
RockHer
November 1, 2026
Retailer 12$5,521 AUD
Retailer 13$5,629 AUD
Retailer 6$5,781 AUD
Retailer 15$5,941 AUD
Retailer 18$5,953 AUD
Retailer 7$6,307 AUD
Retailer 10$7,008 AUD
Retailer 9$7,427 AUD
Retailer 5$7,474 AUD
Retailer 4$7,488 AUD
Retailer 16$7,488 AUD
Retailer 19$7,488 AUD
Retailer 17$7,730 AUD
Retailer 1$8,145 AUD
Retailer 3$8,372 AUD
Retailer 14$8,563 AUD
Retailer 11$9,365 AUD
Retailer 8$11,942 AUD
Retailer 2$20,827 AUD
RockHer$21,304 AUD

28 data points across 20 retailers

19 retailers$5,521 AUD to $20,827 AUD

A
Cheapest Retailer
-
$5,521 AUD
HK$30,300 HKD
A
Retailer 2
-
$5,629 AUD
$3,954 USD
View
A
Retailer 3
-
$5,941 AUD
$4,173 USD
View
A
Retailer 4
-
$5,953 AUD
$4,182 USD
View
Retailer 5
-
$6,307 AUD
$4,430 USD
View
Price last confirmed 24 days ago
Retailer 6
-
$7,008 AUD
SGD 6,652 SGD
View
Price last confirmed 23 days ago
Retailer 7
-
$7,427 AUD
$5,217 USD
View
Price last confirmed 25 days ago
Retailer 8
-
$7,474 AUD
$5,250 USD
View
Price last confirmed 23 days ago
Retailer 9
-
$7,488 AUD
View
Price last confirmed 23 days ago
A
Retailer 10
-
$7,488 AUD
$5,260 USD
View
A
Retailer 11
-
$7,488 AUD
$5,260 USD
View
A
Retailer 12
-
$7,715 AUD
View
A
Retailer 13
-
$7,730 AUD
$5,430 USD
View
A
Retailer 14
-
$8,145 AUD
£4,505 GBP
View
A
Retailer 15
-
$8,563 AUD
$6,015 USD
View
Retailer 16
-
$9,365 AUD
ZAR 106,279 ZAR
View
Price last confirmed 32 days ago
Retailer 17
-
$11,942 AUD
£6,605 GBP
View
Price last confirmed 25 days ago
B
Retailer 18
-
$20,827 AUD
$14,630 USD
View
Final sale: no returns
Most Expensive
RockHer
98727268 · Oct 24
$21,304 AUD
$14,965 USD
View
Price last confirmed 9 days ago
18 more retailers have this diamond
Prices start from $5,521 AUDSave up to $15,306 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
$5,521 AUD