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Cushion|Natural|GIA

1.51ct M SI1 Cushion Natural Diamond

ID • M/SI1 • GIA 5556439635

Certificate GIA 5556439635

Diamond specifications and retailer prices

From $3,503 AUD
As of November 6, 2026
Save $1,883 AUD (35%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $5,387 AUD at Cape Diamonds · As of November 5, 2026
View at Cape 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 M colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 5556439635. Listed at 7 retailers as of November 5, 2026, with prices from $3,503 to $5,387, a $1,883 spread on the same certified stone. Cape Diamonds lists it at $5,387. 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
M
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 5556439635
Dimensions7.83 × 5.59 × 3.66 mm
L/W Ratio1.40
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal, Cloud
Top View
7.83 mm5.59 mm1.51 ctM / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 5556439635
Side View
Table 66.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 65.5%

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: $5,387 AUD|Low: $3,503 AUD|High: $5,819 AUD|Avg: $4,695 AUD|-7.2%
Cape Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 2$3,503 AUD
Retailer 4$4,301 AUD
Retailer 7$4,435 AUD
Retailer 6$4,619 AUD
Retailer 5$4,774 AUD
Retailer 3$5,138 AUD
Cape Diamonds$5,387 AUD

45 data points across 7 retailers

7 retailers$3,503 AUD to $5,387 AUD

A
Cheapest Retailer
-
$3,503 AUD
B
Retailer 2
-
$4,301 AUD
View
Retailer 3
-
$4,435 AUD
View
Price last confirmed 22 days ago
B
Retailer 4
-
$4,619 AUD
View
B
Retailer 5
-
$4,774 AUD
View
B
Retailer 6
-
$5,138 AUD
View
Most Expensive
B
Cape Diamonds
cert_5556439635 · Nov 5
$5,387 AUD
ZAR 59,791 ZAR
View
6 more retailers have this diamond
Prices start from $3,503 AUDSave up to $1,883 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
$3,503 AUD