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Cushion|Natural|GIA

1.50ct F SI1 Cushion Natural Diamond

EX • F/SI1 • GIA 6551751587

Certificate GIA 6551751587

Diamond specifications and retailer prices

From $6,986 AUD
As of November 6, 2026
Save $6,666 AUD (49%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $14,454 AUD at Queensmith · As of October 22, 2026
View at Queensmith

About this 1.5ct natural cushion diamond

This 1.5ct 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 6551751587. Listed at 19 retailers as of November 6, 2026, with a 95% 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

1.50
Carat
F
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6551751587
Dimensions7.45 × 5.66 × 3.94 mm
L/W Ratio1.32
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Cavity, Natural
Top View
7.45 mm5.66 mm1.50 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6551751587
Side View
Table 66.0%CrownGirdle: MED-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 6
Current: $14,454 AUD|Low: $6,929 AUD|High: $14,630 AUD|Avg: $9,716 AUD|+1.4%
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 7, 2026
Retailer 13$6,986 AUD
Retailer 9$7,382 AUD
Retailer 14$7,781 AUD
Retailer 12$8,274 AUD
Retailer 3$8,599 AUD
Retailer 2$8,725 AUD
Retailer 8$8,871 AUD
Retailer 4$9,169 AUD
Retailer 6$9,265 AUD
Retailer 5$9,545 AUD
Retailer 10$10,122 AUD
Retailer 11$11,365 AUD
Retailer 7$13,652 AUD
Queensmith$14,454 AUD

25 data points across 14 retailers

19 retailers$6,986 AUD to $13,652 AUD

A
Cheapest Retailer
-
$6,986 AUD
A
Retailer 2
-
$7,382 AUD
View
A
Retailer 3
-
$7,781 AUD
View
Retailer 4
-
$8,019 AUD
View
Price last confirmed 24 days ago
B+
Retailer 5
-
$8,274 AUD
View
B+
Retailer 6
-
$8,556 AUD
View
B+
Retailer 7
-
$8,558 AUD
View
B+
Retailer 8
-
$8,599 AUD
View
Final sale: no returns
B+
Retailer 9
-
$8,725 AUD
View
B+
Retailer 10
-
$8,871 AUD
View
B+
Retailer 11
-
$9,169 AUD
View
Retailer 12
-
$9,265 AUD
View
Price last confirmed 29 days ago
Retailer 13
-
$9,373 AUD
View
Price last confirmed 22 days ago
B+
Retailer 14
-
$9,545 AUD
View
B+
Retailer 15
-
$9,665 AUD
View
B+
Retailer 16
-
$10,122 AUD
View
B+
Retailer 17
-
$11,365 AUD
View
B
Retailer 18
-
$13,652 AUD
View
Most Expensive
Queensmith
6551751587 · Oct 22
$14,454 AUD
£7,820 GBP
View
Price last confirmed 16 days ago
18 more retailers have this diamond
Prices start from $6,986 AUDSave up to $6,666 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
1.50ct Cushion
$6,986 AUD