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Cushion|Natural|GIA

1.05ct L SI1 Cushion Natural Diamond

EX • L/SI1 • GIA 2178228123

Certificate GIA 2178228123

Diamond specifications and retailer prices

From $2,870 AUD
As of November 4, 2026
Save $1,410 AUD (33%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $4,280 AUD at Cape Diamonds · As of November 5, 2026
View at Cape Diamonds

About this 1.05ct natural cushion diamond

This 1.05ct natural cushion sits in the classic one-carat band, graded L 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 2178228123. Listed at 9 retailers as of November 4, 2026, with prices from $2,870 to $4,280, a $1,410 spread on the same certified stone. Cape Diamonds lists it at $4,280. 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

1.05
Carat
L
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2178228123
Dimensions6.55 × 5.49 × 3.73 mm
L/W Ratio1.19
Culet sizeNone
Top View
6.55 mm5.49 mm1.05 ctL / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 2178228123
Side View
Table 65.0%CrownGirdle: STK-ETKPavilionCulet: NoneDepth 67.9%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 4
Current: $4,280 AUD|Low: $2,816 AUD|High: $4,310 AUD|Avg: $3,634 AUD|+2.7%
Cape Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 4$2,816 AUD
Retailer 5$3,177 AUD
Retailer 6$3,628 AUD
Retailer 3$3,710 AUD
Retailer 2$4,091 AUD
Cape Diamonds$4,280 AUD

45 data points across 6 retailers

9 retailers$2,870 AUD to $4,280 AUD

Retailer 1
-
$2,816 AUD
Price last confirmed 12 days ago
B
Retailer 2
-
$2,870 AUD
View
Retailer 3
-
$3,177 AUD
View
Price last confirmed 8 days ago
B
Retailer 4
-
$3,202 AUD
View
B
Retailer 5
-
$3,438 AUD
View
B
Retailer 6
-
$3,628 AUD
View
B
Retailer 7
-
$3,710 AUD
View
B
Retailer 8
-
$4,091 AUD
View
Most Expensive
B
Cape Diamonds
cert_2178228123 · Nov 5
$4,280 AUD
ZAR 47,510 ZAR
View
8 more retailers have this diamond
Prices start from $2,870 AUDSave up to $1,410 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.

B
1.05ct Cushion
$2,870 AUD