Cushion|Natural|GIA

0.51ct D SI1 Cushion Natural Diamond

VG • D/SI1 • GIA 6421683223

Certificate GIA 6421683223

Diamond specifications and retailer prices

From $800 USD
As of November 6, 2026
Save $876 USD (52%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $1,676 USD 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 $800 to $1,676, a $876 spread on the same certified stone. MOH London lists it at $1,676. 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
Color
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: $1,676 USD|Low: $877 USD|High: $1,699 USD|Avg: $1,192 USD|-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$915 USD
Retailer 9$922 USD
Retailer 4$925 USD
Retailer 8$939 USD
Retailer 6$1,090 USD
Retailer 10$1,213 USD
Retailer 2$1,314 USD
Retailer 7$1,411 USD
Retailer 3$1,448 USD
MOH London$1,676 USD

46 data points across 10 retailers

16 retailers$800 USD to $1,676 USD

B+
Cheapest Retailer
-
$800 USD
Retailer 2
-
$915 USD
View
Price last confirmed 16 days ago
B
Retailer 3
-
$918 USD
View
B
Retailer 4
-
$922 USD
View
B
Retailer 5
-
$925 USD
View
Retailer 6
-
$939 USD
View
Price last confirmed 8 days ago
B
Retailer 7
-
$948 USD
View
B
Retailer 8
-
$990 USD
View
B
Retailer 9
-
$990 USD
View
B
Retailer 10
-
$1,030 USD
View
B
Retailer 11
-
$1,071 USD
View
B
Retailer 12
-
$1,090 USD
View
B
Retailer 13
-
$1,314 USD
View
Retailer 14
-
$1,411 USD
View
Price last confirmed 32 days ago
B
Retailer 15
-
$1,448 USD
View
Most Expensive
B
MOH London
D98507D3B · Nov 4
$1,676 USD
£1,320 GBP
View
15 more retailers have this diamond
Prices start from $800 USDSave up to $876 USD

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
$800 USD