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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 $5,959 SGD
HK$36,400 HKD
As of November 1, 2026
Save $6,596 SGD (53%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $12,555 SGD 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 $5,959 to $12,555, a $6,596 spread on the same certified stone. Queensmith lists it at $12,555. 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
Colour
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: $12,555 SGD|Low: $5,893 SGD|High: $12,644 SGD|Avg: $8,350 SGD|+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$5,959 SGD
Retailer 6$6,061 SGD
Retailer 2$6,348 SGD
Retailer 13$6,634 SGD
Retailer 14$6,787 SGD
Retailer 4$6,953 SGD
Retailer 8$7,613 SGD
Retailer 12$7,936 SGD
Retailer 5$8,137 SGD
Retailer 3$8,296 SGD
Retailer 7$8,669 SGD
Retailer 10$9,750 SGD
Retailer 9$11,691 SGD
Queensmith$12,555 SGD

28 data points across 14 retailers

18 retailers$5,959 SGD to $12,555 SGD

A
Cheapest Retailer
-
$5,959 SGD
HK$36,400 HKD
A
Retailer 2
-
$6,061 SGD
View
A
Retailer 3
-
$6,348 SGD
₹472,755 INR
View
A
Retailer 4
-
$6,634 SGD
$5,187 USD
View
A
Retailer 5
-
$6,787 SGD
View
A
Retailer 6
-
$6,953 SGD
$5,437 USD
View
B+
Retailer 7
-
$7,288 SGD
$5,699 USD
View
B+
Retailer 8
-
$7,290 SGD
$5,700 USD
View
B+
Retailer 9
-
$7,613 SGD
£4,687 GBP
View
B+
Retailer 10
-
$7,936 SGD
$6,205 USD
View
Retailer 11
-
$7,936 SGD
A$9,547 AUD
View
Price last confirmed 29 days ago
B+
Retailer 12
-
$8,128 SGD
A$9,778 AUD
View
B+
Retailer 13
-
$8,137 SGD
$6,362 USD
View
B+
Retailer 14
-
$8,296 SGD
$6,487 USD
View
B+
Retailer 15
-
$8,669 SGD
€6,456 EUR
View
B+
Retailer 16
-
$9,750 SGD
ZAR 123,162 ZAR
View
B
Retailer 17
-
$11,691 SGD
£7,198 GBP
View
Most Expensive
B
Queensmith
2556191991 · Oct 28
$12,555 SGD
£7,730 GBP
View
17 more retailers have this diamond
Prices start from $5,959 SGDSave up to $6,596 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.

A
1.51ct Cushion
$5,959 SGD