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Cushion|Natural|GIA

0.51ct I SI1 Cushion Natural Diamond

VG • I/SI1 • GIA 1549165866

Certificate GIA 1549165866

Diamond specifications and retailer prices

From £210 GBP
₹26,866 INR
As of November 2, 2026
Save £455 GBP (68%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £665 GBP at MOH London · As of November 2, 2026
View at MOH London

About this 0.51ct natural cushion diamond

This 0.51ct natural cushion sits in the half to three-quarter carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 1549165866. Listed at 8 retailers as of November 2, 2026, with prices from £210 to £665, a £455 spread on the same certified stone. MOH London lists it at £665. 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

0.51
Carat
I
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceStrong
OriginNatural
Grading LabGIA
CertificateGIA 1549165866
Dimensions4.63 × 4.51 × 3.00 mm
L/W Ratio1.03
Girdle conditionFaceted
Key to symbols
Feather, Crystal
Top View
4.63 mm4.51 mm0.51 ctI / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 1549165866
Side View
Table 58.0%CrownGirdle: Very ThickPavilionCulet: NoneDepth 66.6%

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 2
Current: £665 GBP|Low: £210 GBP|High: £674 GBP|Avg: £442 GBP|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 2, 2026
Retailer 2£210 GBP
Retailer 3£376 GBP
Retailer 5£445 GBP
Retailer 6£447 GBP
Retailer 7£462 GBP
Retailer 4£525 GBP
MOH London£665 GBP

36 data points across 7 retailers

8 retailers£210 GBP to £665 GBP

A
Cheapest Retailer
-
£210 GBP
₹26,866 INR
B+
Retailer 2
-
£317 GBP
$425 USD
View
B+
Retailer 3
-
£376 GBP
View
B+
Retailer 4
-
£445 GBP
ZAR 9,644 ZAR
View
B
Retailer 5
-
£447 GBP
$600 USD
View
Retailer 6
-
£462 GBP
A$953 AUD
View
Price last confirmed 30 days ago
B
Retailer 7
-
£525 GBP
€671 EUR
View
Most Expensive
B
MOH London
BED87C1C3 · Nov 2
£665 GBP
View
7 more retailers have this diamond
Prices start from £210 GBPSave up to £455 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
0.51ct Cushion
£210 GBP