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Cushion|Natural|GIA

1.78ct I SI2 Cushion Natural Diamond

EX • I/SI2 • GIA 6552498342

Certificate GIA 6552498342

Diamond specifications and retailer prices

From $8,000 SGD
A$9,628 AUD
As of November 2, 2026
3 retailers carry this diamond
Most expensive: $9,992 SGD at 77 Diamonds · As of October 21, 2026
View at 77 Diamonds

About this 1.78ct natural cushion diamond

This 1.78ct natural cushion sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6552498342. Listed at 3 retailers as of November 2, 2026. 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

1.78
Carat
I
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
Pavilion angle36.57°
OriginNatural
Grading LabGIA
CertificateGIA 6552498342
Dimensions8.25 × 6.23 × 4.32 mm
L/W Ratio1.32
Key to symbols
Twinning Wisp, Crystal, Feather, Needle
Top View
8.25 mm6.23 mm1.78 ctI / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 6552498342
Side View
Table 63.0%CrownGirdle: MED-VTKPavilion 36.57°Culet: NoneDepth 69.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: $9,992 SGD|Low: $6,104 SGD|High: $12,359 SGD|Avg: $8,582 SGD|-5.2%
77 Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 21, 2026
Retailer 3$6,104 SGD
Retailer 5$7,019 SGD
Retailer 4$7,360 SGD
Retailer 6$8,000 SGD
Retailer 7$9,281 SGD
77 Diamonds$9,992 SGD
Retailer 2$12,235 SGD

17 data points across 7 retailers

3 retailers

Retailer 1
-
$6,104 SGD
HK$37,300 HKD
Price last confirmed 43 days ago
B+
Retailer 2
-
$8,000 SGD
A$9,628 AUD
View
Most Expensive
77 Diamonds
CUSMBFVDGNJCK · Oct 21
$9,992 SGD
£6,154 GBP
View
Price last confirmed 12 days ago
2 more retailers have this diamond
Prices start from $8,000 SGD

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+
1.78ct Cushion
$8,000 SGD