Round|Natural|GIA

5.66ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 5221259171

Certificate GIA 5221259171

Diamond specifications and retailer prices

From €154,846 EUR
£136,216 GBP
As of November 1, 2026
Save €23,814 EUR (13%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: €178,660 EUR at Jared · As of October 30, 2026
View at Jared

About this 5.66ct natural round diamond

This 5.66ct natural round sits in the over five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5221259171. Listed at 3 retailers as of October 30, 2026, with prices from €154,846 to €178,660, a €23,814 spread on the same certified stone. Jared lists it at €178,660. 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

5.66
Carat
E
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 5221259171
Dimensions11.43 × 11.46 × 7.05 mm
L/W Ratio1.00
Top View
11.43 mm11.46 mm5.66 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5221259171
Side View
Table 56.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 61.6%

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 1
Current: €178,660 EUR|Low: €146,696 EUR|High: €251,739 EUR|Avg: €182,156 EUR|-2.4%
Jared
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 1, 2026
Retailer 3€146,769 EUR
Retailer 2€154,846 EUR
Retailer 6€166,887 EUR
Jared€178,660 EUR
Retailer 4€189,669 EUR
Retailer 5€251,739 EUR

30 data points across 6 retailers

3 retailers€154,846 EUR to €178,660 EUR

Retailer 1
-
€146,769 EUR
A$252,263 AUD
Price last confirmed 36 days ago
B+
Retailer 2
-
€154,846 EUR
£136,216 GBP
View
Most Expensive
B
Jared
159413271 · Oct 30
€178,660 EUR
$199,600 USD
View
2 more retailers have this diamond
Prices start from €154,846 EURSave up to €23,814 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.

B+
5.66ct Round
€154,846 EUR