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Cushion|Natural|GIA

1.51ct F SI1 Cushion Natural Diamond

EX • F/SI1 • GIA 2556191991

Certificate GIA 2556191991

Diamond specifications and retailer prices

From $4,659 USD
HK$36,400 HKD
As of November 1, 2026
Save $5,158 USD (53%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $9,817 USD 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 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 2556191991. Listed at 18 retailers as of October 28, 2026, with prices from $4,659 to $9,817, a $5,158 spread on the same certified stone. Queensmith lists it at $9,817. 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
F
Color
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2556191991
Dimensions8.09 × 5.59 × 3.82 mm
L/W Ratio1.45
Top View
8.09 mm5.59 mm1.51 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2556191991
Side View
Table 65.0%CrownGirdle: THN-THKPavilionCulet: NoneDepth 68.3%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $9,817 USD|Low: $4,608 USD|High: $9,887 USD|Avg: $6,529 USD|+1.9%
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 2, 2026
Retailer 11$4,659 USD
Retailer 6$4,739 USD
Retailer 2$4,964 USD
Retailer 13$5,187 USD
Retailer 14$5,307 USD
Retailer 4$5,437 USD
Retailer 8$5,953 USD
Retailer 12$6,205 USD
Retailer 5$6,362 USD
Retailer 3$6,487 USD
Retailer 7$6,779 USD
Retailer 10$7,624 USD
Retailer 9$9,141 USD
Queensmith$9,817 USD

28 data points across 14 retailers

18 retailers$4,659 USD to $9,817 USD

A
Cheapest Retailer
-
$4,659 USD
HK$36,400 HKD
A
Retailer 2
-
$4,739 USD
SGD 6,404 SGD
View
A
Retailer 3
-
$4,964 USD
₹472,755 INR
View
A
Retailer 4
-
$5,187 USD
View
A
Retailer 5
-
$5,307 USD
SGD 7,171 SGD
View
A
Retailer 6
-
$5,437 USD
View
B+
Retailer 7
-
$5,699 USD
View
B+
Retailer 8
-
$5,700 USD
View
B+
Retailer 9
-
$5,953 USD
£4,687 GBP
View
B+
Retailer 10
-
$6,205 USD
View
Retailer 11
-
$6,206 USD
A$9,547 AUD
View
Price last confirmed 29 days ago
B+
Retailer 12
-
$6,356 USD
A$9,778 AUD
View
B+
Retailer 13
-
$6,362 USD
View
B+
Retailer 14
-
$6,487 USD
View
B+
Retailer 15
-
$6,779 USD
€6,456 EUR
View
B+
Retailer 16
-
$7,624 USD
ZAR 123,162 ZAR
View
B
Retailer 17
-
$9,141 USD
£7,198 GBP
View
Most Expensive
B
Queensmith
2556191991 · Oct 28
$9,817 USD
£7,730 GBP
View
17 more retailers have this diamond
Prices start from $4,659 USDSave up to $5,158 USD

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
$4,659 USD