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Cushion|Natural|GIA

0.51ct D SI1 Cushion Natural Diamond

VG • D/SI1 • GIA 6421683223

Certificate GIA 6421683223

Diamond specifications and retailer prices

From £598 GBP
As of November 6, 2026
Save £655 GBP (52%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £1,252 GBP at MOH London · As of November 4, 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 D colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 6421683223. Listed at 16 retailers as of November 4, 2026, with prices from £598 to £1,252, a £655 spread on the same certified stone. MOH London lists it at £1,252. 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
D
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6421683223
Dimensions4.68 × 4.18 × 2.92 mm
L/W Ratio1.12
Top View
4.68 mm4.18 mm0.51 ctD / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6421683223
Side View
Table 59.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 69.8%

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 6
Current: £1,252 GBP|Low: £655 GBP|High: £1,270 GBP|Avg: £890 GBP|-0.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 5£684 GBP
Retailer 9£689 GBP
Retailer 4£691 GBP
Retailer 8£702 GBP
Retailer 6£814 GBP
Retailer 10£906 GBP
Retailer 2£982 GBP
Retailer 7£1,054 GBP
Retailer 3£1,082 GBP
MOH London£1,252 GBP

45 data points across 10 retailers

16 retailers£598 GBP to £1,252 GBP

B+
Cheapest Retailer
-
£598 GBP
Retailer 2
-
£684 GBP
View
Price last confirmed 17 days ago
B
Retailer 3
-
£686 GBP
View
B
Retailer 4
-
£689 GBP
View
B
Retailer 5
-
£691 GBP
View
Retailer 6
-
£702 GBP
View
Price last confirmed 9 days ago
B
Retailer 7
-
£708 GBP
View
B
Retailer 8
-
£740 GBP
View
B
Retailer 9
-
£740 GBP
View
B
Retailer 10
-
£770 GBP
View
B
Retailer 11
-
£800 GBP
View
B
Retailer 12
-
£814 GBP
View
B
Retailer 13
-
£982 GBP
View
Retailer 14
-
£1,054 GBP
View
Price last confirmed 33 days ago
B
Retailer 15
-
£1,082 GBP
View
Most Expensive
B
MOH London
D98507D3B · Nov 4
£1,252 GBP
View
15 more retailers have this diamond
Prices start from £598 GBPSave up to £655 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+
0.51ct Cushion
£598 GBP