CaratHunter
Plans
Cushion|Natural|GIA

1.51ct M SI1 Cushion Natural Diamond

ID • M/SI1 • GIA 5556439635

Certificate GIA 5556439635

Diamond specifications and retailer prices

From £1,798 GBP
As of November 6, 2026
Save £967 GBP (35%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £2,765 GBP at Cape Diamonds · As of November 5, 2026
View at Cape Diamonds

About this 1.51ct natural cushion diamond

This 1.51ct natural cushion sits in the one-and-a-half to two carat band, graded M colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 5556439635. Listed at 7 retailers as of November 5, 2026, with prices from £1,798 to £2,765, a £967 spread on the same certified stone. Cape Diamonds lists it at £2,765. 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
M
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 5556439635
Dimensions7.83 × 5.59 × 3.66 mm
L/W Ratio1.40
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal, Cloud
Top View
7.83 mm5.59 mm1.51 ctM / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 5556439635
Side View
Table 66.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 65.5%

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 6
Current: £2,765 GBP|Low: £1,798 GBP|High: £2,987 GBP|Avg: £2,410 GBP|-7.2%
Cape Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 2£1,798 GBP
Retailer 4£2,208 GBP
Retailer 7£2,276 GBP
Retailer 6£2,371 GBP
Retailer 5£2,451 GBP
Retailer 3£2,637 GBP
Cape Diamonds£2,765 GBP

45 data points across 7 retailers

7 retailers£1,798 GBP to £2,765 GBP

A
Cheapest Retailer
-
£1,798 GBP
B
Retailer 2
-
£2,208 GBP
View
Retailer 3
-
£2,276 GBP
View
Price last confirmed 22 days ago
B
Retailer 4
-
£2,371 GBP
View
B
Retailer 5
-
£2,451 GBP
View
B
Retailer 6
-
£2,637 GBP
View
Most Expensive
B
Cape Diamonds
cert_5556439635 · Nov 5
£2,765 GBP
ZAR 59,791 ZAR
View
6 more retailers have this diamond
Prices start from £1,798 GBPSave up to £967 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
£1,798 GBP