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Cushion|Natural|GIA

1.51ct H SI1 Cushion Natural Diamond

ID • H/SI1 • GIA 6565025664

Certificate GIA 6565025664

Diamond specifications and retailer prices

From $2,893 USD
HK$22,600 HKD
As of November 1, 2026
Save $8,835 USD (75%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $11,728 USD at William & Sons Jewelers · As of November 2, 2026
View at William & Sons Jewelers

About this 1.51ct natural cushion diamond

This 1.51ct natural cushion sits in the one-and-a-half to two carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6565025664. Listed at 20 retailers as of November 1, 2026, with prices from $2,893 to $11,728, a $8,835 spread on the same certified stone. William & Sons Jewelers lists it at $11,728. 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
H
Color
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.2°
Pavilion angle35.9°
OriginNatural
Grading LabGIA
CertificateGIA 6565025664
Dimensions6.77 × 6.44 × 4.39 mm
L/W Ratio1.05
Girdle conditionFaceted
Culet sizeNone
Top View
6.77 mm6.44 mm1.51 ctH / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6565025664
Side View
Table 64.0%Crown 33.2°Girdle: MED-THKPavilion 35.9°Culet: NDepth 68.1%

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: $4,375 USD|Low: $2,759 USD|High: $14,751 USD|Avg: $4,705 USD|+13.0%
Retailer 1
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Retailer 3
Retailer 4
Retailer 5
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Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
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Retailer 15
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Retailer 17
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Retailer 19
William & Sons Jewelers
November 2, 2026
Retailer 15$2,893 USD
Retailer 3$2,975 USD
Retailer 7$2,980 USD
Retailer 13$3,048 USD
Retailer 12$3,076 USD
Retailer 17$3,130 USD
Retailer 10$3,361 USD
Retailer 16$3,702 USD
Retailer 18$3,910 USD
Retailer 19$3,910 USD
Retailer 2$4,040 USD
Retailer 8$4,090 USD
Retailer 1$4,375 USD
Retailer 5$4,452 USD
Retailer 6$4,503 USD
Retailer 14$4,530 USD
Retailer 11$4,604 USD
Retailer 9$6,445 USD
Retailer 4$11,555 USD
William & Sons Jewelers$11,728 USD

26 data points across 20 retailers

20 retailers$2,893 USD to $11,728 USD

A
Cheapest Retailer
-
$2,893 USD
HK$22,600 HKD
A
Retailer 2
-
$2,975 USD
View
A
Retailer 3
-
$3,048 USD
View
A
Retailer 4
-
$3,076 USD
View
A
Retailer 5
-
$3,130 USD
View
Retailer 6
-
$3,361 USD
View
Price last confirmed 25 days ago
Retailer 7
-
$3,594 USD
SGD 4,857 SGD
View
Price last confirmed 24 days ago
A
Retailer 8
-
$3,702 USD
View
A
Retailer 9
-
$3,910 USD
View
A
Retailer 10
-
$3,910 USD
View
Retailer 11
-
$4,000 USD
View
Price last confirmed 24 days ago
A
Retailer 12
-
$4,040 USD
View
Retailer 13
-
$4,090 USD
A$6,292 AUD
View
Price last confirmed 24 days ago
A
Retailer 14
-
$4,269 USD
A$6,568 AUD
View
B+
Retailer 15
-
$4,375 USD
£3,445 GBP
View
A
Retailer 16
-
$4,530 USD
View
Retailer 17
-
$4,604 USD
ZAR 74,372 ZAR
View
Price last confirmed 32 days ago
Retailer 18
-
$6,445 USD
£5,075 GBP
View
Price last confirmed 25 days ago
Retailer 19
-
$11,555 USD
View
Price last confirmed 9 days ago
Most Expensive
C
William & Sons Jewelers
cert_6565025664 · Nov 2
$11,728 USD
View
Final sale: no returns
19 more retailers have this diamond
Prices start from $2,893 USDSave up to $8,835 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
$2,893 USD