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Cushion|Natural|GIA

1.51ct F SI1 Cushion Natural Diamond

EX • F/SI1 • GIA 2556191991

Certificate GIA 2556191991

Diamond specifications and retailer prices

From $6,648 AUD
HK$36,400 HKD
As of November 1, 2026
Save $7,360 AUD (53%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $14,008 AUD at Queensmith · As of October 28, 2026
View at Queensmith

About this 1.51ct natural cushion diamond

This 1.51ct natural cushion sits in the one-and-a-half to two carat band, graded F 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 2556191991. Listed at 18 retailers as of October 28, 2026, with prices from $6,648 to $14,008, a $7,360 spread on the same certified stone. Queensmith lists it at $14,008. 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
F
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2556191991
Dimensions8.09 × 5.59 × 3.82 mm
L/W Ratio1.45
Top View
8.09 mm5.59 mm1.51 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2556191991
Side View
Table 65.0%CrownGirdle: THN-THKPavilionCulet: NoneDepth 68.3%

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 1
Current: $14,008 AUD|Low: $6,575 AUD|High: $14,108 AUD|Avg: $9,316 AUD|+1.9%
Queensmith
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
November 2, 2026
Retailer 11$6,648 AUD
Retailer 6$6,762 AUD
Retailer 2$7,083 AUD
Retailer 13$7,401 AUD
Retailer 14$7,572 AUD
Retailer 4$7,758 AUD
Retailer 8$8,494 AUD
Retailer 12$8,854 AUD
Retailer 5$9,078 AUD
Retailer 3$9,256 AUD
Retailer 7$9,673 AUD
Retailer 10$10,878 AUD
Retailer 9$13,044 AUD
Queensmith$14,008 AUD

28 data points across 14 retailers

18 retailers$6,648 AUD to $14,008 AUD

A
Cheapest Retailer
-
$6,648 AUD
HK$36,400 HKD
A
Retailer 2
-
$6,762 AUD
SGD 6,404 SGD
View
A
Retailer 3
-
$7,083 AUD
₹472,755 INR
View
A
Retailer 4
-
$7,401 AUD
$5,187 USD
View
A
Retailer 5
-
$7,572 AUD
SGD 7,171 SGD
View
A
Retailer 6
-
$7,758 AUD
$5,437 USD
View
B+
Retailer 7
-
$8,132 AUD
$5,699 USD
View
B+
Retailer 8
-
$8,133 AUD
$5,700 USD
View
B+
Retailer 9
-
$8,494 AUD
£4,687 GBP
View
B+
Retailer 10
-
$8,854 AUD
$6,205 USD
View
Retailer 11
-
$8,855 AUD
View
Price last confirmed 30 days ago
B+
Retailer 12
-
$9,069 AUD
View
B+
Retailer 13
-
$9,078 AUD
$6,362 USD
View
B+
Retailer 14
-
$9,256 AUD
$6,487 USD
View
B+
Retailer 15
-
$9,673 AUD
€6,456 EUR
View
B+
Retailer 16
-
$10,878 AUD
ZAR 123,162 ZAR
View
B
Retailer 17
-
$13,044 AUD
£7,198 GBP
View
Most Expensive
B
Queensmith
2556191991 · Oct 28
$14,008 AUD
£7,730 GBP
View
17 more retailers have this diamond
Prices start from $6,648 AUDSave up to $7,360 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
$6,648 AUD