CaratHunter
Plans
Cushion|Natural|GIA

1.51ct H SI1 Cushion Natural Diamond

ID • H/SI1 • GIA 6565025664

Certificate GIA 6565025664

Diamond specifications and retailer prices

From £2,159 GBP
HK$22,600 HKD
As of November 1, 2026
Save £6,594 GBP (75%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £8,753 GBP 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 £2,159 to £8,753, a £6,594 spread on the same certified stone. William & Sons Jewelers lists it at £8,753. 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
Colour
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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £3,265 GBP|Low: £2,059 GBP|High: £11,009 GBP|Avg: £3,512 GBP|+13.0%
Retailer 1
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
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
William & Sons Jewelers
November 2, 2026
Retailer 15£2,159 GBP
Retailer 3£2,220 GBP
Retailer 7£2,224 GBP
Retailer 13£2,275 GBP
Retailer 12£2,296 GBP
Retailer 17£2,336 GBP
Retailer 10£2,508 GBP
Retailer 16£2,763 GBP
Retailer 18£2,918 GBP
Retailer 19£2,918 GBP
Retailer 2£3,015 GBP
Retailer 8£3,052 GBP
Retailer 1£3,265 GBP
Retailer 5£3,323 GBP
Retailer 6£3,361 GBP
Retailer 14£3,381 GBP
Retailer 11£3,436 GBP
Retailer 9£4,810 GBP
Retailer 4£8,624 GBP
William & Sons Jewelers£8,753 GBP

26 data points across 20 retailers

20 retailers£2,159 GBP to £8,753 GBP

A
Cheapest Retailer
-
£2,159 GBP
HK$22,600 HKD
A
Retailer 2
-
£2,220 GBP
$2,975 USD
View
A
Retailer 3
-
£2,275 GBP
$3,048 USD
View
A
Retailer 4
-
£2,296 GBP
$3,076 USD
View
A
Retailer 5
-
£2,336 GBP
$3,130 USD
View
Retailer 6
-
£2,508 GBP
$3,361 USD
View
Price last confirmed 25 days ago
Retailer 7
-
£2,682 GBP
SGD 4,857 SGD
View
Price last confirmed 24 days ago
A
Retailer 8
-
£2,763 GBP
$3,702 USD
View
A
Retailer 9
-
£2,918 GBP
$3,910 USD
View
A
Retailer 10
-
£2,918 GBP
$3,910 USD
View
Retailer 11
-
£2,985 GBP
$4,000 USD
View
Price last confirmed 24 days ago
A
Retailer 12
-
£3,015 GBP
$4,040 USD
View
Retailer 13
-
£3,052 GBP
A$6,292 AUD
View
Price last confirmed 24 days ago
A
Retailer 14
-
£3,186 GBP
A$6,568 AUD
View
B+
Retailer 15
-
£3,265 GBP
View
A
Retailer 16
-
£3,381 GBP
$4,530 USD
View
Retailer 17
-
£3,436 GBP
ZAR 74,372 ZAR
View
Price last confirmed 32 days ago
Retailer 18
-
£4,810 GBP
View
Price last confirmed 25 days ago
Retailer 19
-
£8,624 GBP
$11,555 USD
View
Price last confirmed 9 days ago
Most Expensive
C
William & Sons Jewelers
cert_6565025664 · Nov 2
£8,753 GBP
$11,728 USD
View
Final sale: no returns
19 more retailers have this diamond
Prices start from £2,159 GBPSave up to £6,594 GBP

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
£2,159 GBP