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Cushion|Natural|GIA

1.51ct K SI1 Cushion Natural Diamond

GD • K/SI1 • GIA 6445506666

Certificate GIA 6445506666

Diamond specifications and retailer prices

From £1,696 GBP
As of November 4, 2026
Save £1,889 GBP (53%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £3,585 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1.51ct natural cushion diamond

This 1.51ct natural cushion sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 6445506666. Listed at 15 retailers as of November 4, 2026, with prices from £1,696 to £3,585, a £1,889 spread on the same certified stone. MOH London lists it at £3,585. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.51
Carat
K
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishVery Good
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6445506666
Dimensions6.60 × 5.95 × 4.24 mm
L/W Ratio1.11
Top View
6.60 mm5.95 mm1.51 ctK / SI1
OriginNatural
CutGood
PolishVery Good
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6445506666
Side View
Table 66.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 71.2%

Caratlytics Score

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

Price History

Last verified: Nov 4
Current: £3,585 GBP|Low: £1,696 GBP|High: £3,633 GBP|Avg: £2,317 GBP|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 6£1,696 GBP
Retailer 7£1,837 GBP
Retailer 8£1,947 GBP
Retailer 2£2,065 GBP
Retailer 4£2,262 GBP
Retailer 3£2,477 GBP
Retailer 5£2,623 GBP
MOH London£3,585 GBP

38 data points across 8 retailers

15 retailers£1,696 GBP to £3,585 GBP

B+
Cheapest Retailer
-
£1,696 GBP
B+
Retailer 2
-
£1,745 GBP
View
B+
Retailer 3
-
£1,837 GBP
View
B+
Retailer 4
-
£1,924 GBP
View
Retailer 5
-
£1,947 GBP
View
Price last confirmed 9 days ago
B+
Retailer 6
-
£1,976 GBP
View
B+
Retailer 7
-
£1,984 GBP
View
B+
Retailer 8
-
£2,065 GBP
View
B+
Retailer 9
-
£2,099 GBP
View
B+
Retailer 10
-
£2,114 GBP
View
B+
Retailer 11
-
£2,262 GBP
View
B+
Retailer 12
-
£2,477 GBP
View
Retailer 13
-
£2,496 GBP
View
Price last confirmed 15 days ago
B+
Retailer 14
-
£2,623 GBP
View
Most Expensive
B
MOH London
6ED3F1AE5 · Nov 4
£3,585 GBP
View
14 more retailers have this diamond
Prices start from £1,696 GBPSave up to £1,889 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.

B+
1.51ct Cushion
£1,696 GBP