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Cushion|Natural|GIA

5.51ct G SI1 Cushion Natural Diamond

VG • G/SI1 • GIA 6545138645

Certificate GIA 6545138645

Diamond specifications and retailer prices

From €54,145 EUR
£47,818 GBP
As of November 2, 2026
Save €8,443 EUR (13%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: €62,588 EUR at Blue Nile · As of October 31, 2026
View at Blue Nile

About this 5.51ct natural cushion diamond

This 5.51ct natural cushion sits in the over five carat band, graded G 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 6545138645. Listed at 3 retailers as of October 31, 2026, with prices from €54,145 to €62,588, a €8,443 spread on the same certified stone. Blue Nile lists it at €62,588. 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

5.51
Carat
G
Color
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle30.8°
Pavilion angle55.4°
OriginNatural
Grading LabGIA
CertificateGIA 6545138645
Dimensions10.20 × 10.15 × 6.87 mm
L/W Ratio1.00
Top View
10.20 mm10.15 mm5.51 ctG / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6545138645
Side View
Table 70.0%Crown 30.8°Girdle: THK-VTKPavilion 55.4°Culet: NoneDepth 67.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: €62,588 EUR|Low: €54,145 EUR|High: €67,484 EUR|Avg: €62,461 EUR|-6.5%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
November 2, 2026
Retailer 2€54,145 EUR
Retailer 3€58,147 EUR
Blue Nile€62,588 EUR
Retailer 4€67,484 EUR

42 data points across 4 retailers

3 retailers€54,145 EUR to €62,588 EUR

A
Cheapest Retailer
-
€54,145 EUR
£47,818 GBP
A
Retailer 2
-
€58,147 EUR
$65,218 USD
View
Most Expensive
A
Blue Nile
27641085 · Oct 31
€62,588 EUR
$70,199 USD
View
2 more retailers have this diamond
Prices start from €54,145 EURSave up to €8,443 EUR

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
5.51ct Cushion
€54,145 EUR