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Cushion|Natural|GIA

1.51ct E SI1 Cushion Natural Diamond

ID • E/SI1 • GIA 6541087758

Certificate GIA 6541087758

Diamond specifications and retailer prices

From $7,712 AUD
As of November 6, 2026
Save $7,214 AUD (48%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $15,212 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 E 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 6541087758. Listed at 19 retailers as of November 4, 2026, with a 94% 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
E
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6541087758
Dimensions7.78 × 5.93 × 3.92 mm
L/W Ratio1.31
Top View
7.78 mm5.93 mm1.51 ctE / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6541087758
Side View
Table 64.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 66.1%

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: $15,212 AUD|Low: $7,638 AUD|High: $15,323 AUD|Avg: $10,650 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
Retailer 15
November 6, 2026
Retailer 15$7,712 AUD
Retailer 2$8,121 AUD
Retailer 3$8,569 AUD
Retailer 14$8,827 AUD
Retailer 11$9,117 AUD
Retailer 5$9,377 AUD
Retailer 13$9,380 AUD
Retailer 9$9,646 AUD
Retailer 4$9,859 AUD
Retailer 6$9,940 AUD
Retailer 7$10,392 AUD
Retailer 8$11,038 AUD
Retailer 10$12,394 AUD
Retailer 12$14,927 AUD
Queensmith$15,212 AUD

29 data points across 15 retailers

19 retailers$7,712 AUD to $14,927 AUD

A
Cheapest Retailer
-
$7,712 AUD
A
Retailer 2
-
$8,121 AUD
View
A
Retailer 3
-
$8,569 AUD
View
A
Retailer 4
-
$8,827 AUD
View
Retailer 5
-
$8,836 AUD
View
Price last confirmed 22 days ago
A
Retailer 6
-
$9,117 AUD
View
B+
Retailer 7
-
$9,377 AUD
View
Final sale: no returns
B+
Retailer 8
-
$9,380 AUD
View
B+
Retailer 9
-
$9,428 AUD
View
Retailer 10
-
$9,432 AUD
View
Price last confirmed 21 days ago
B+
Retailer 11
-
$9,646 AUD
View
Retailer 12
-
$9,859 AUD
View
Price last confirmed 15 days ago
B+
Retailer 13
-
$9,940 AUD
View
B+
Retailer 14
-
$10,195 AUD
View
B+
Retailer 15
-
$10,392 AUD
View
B+
Retailer 16
-
$11,038 AUD
View
B+
Retailer 17
-
$12,394 AUD
View
B
Retailer 18
-
$14,927 AUD
View
Most Expensive
Queensmith
6541087758 · Oct 28
$15,212 AUD
£8,230 GBP
View
Price last confirmed 9 days ago
18 more retailers have this diamond
Prices start from $7,712 AUDSave up to $7,214 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
$7,712 AUD