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Round|Natural|GIA

0.66ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 5556556629

Certificate GIA 5556556629

Diamond specifications and retailer prices

From €901 EUR
$1,011 USD
As of November 2, 2026
9 retailers carry this diamond
Most expensive: €1,113 EUR at Wholesale Diamonds Direct · As of October 16, 2026
View at Wholesale Diamonds Direct

About this 0.66ct natural round diamond

This 0.66ct natural round sits in the half to three-quarter carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5556556629. Listed at 9 retailers as of November 2, 2026. 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

0.66
Carat
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 5556556629
Dimensions5.57 × 3.48 × 3.48 mm
L/W Ratio1.60
Culet sizeNone
Top View
5.57 mm3.48 mm0.66 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5556556629
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.4%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: €979 EUR|Low: €687 EUR|High: €1,148 EUR|Avg: €926 EUR|-2.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Wholesale Diamonds Direct
October 20, 2026
Retailer 6€687 EUR
Retailer 7€720 EUR
Retailer 10€748 EUR
Retailer 9€764 EUR
Retailer 5€772 EUR
Retailer 4€798 EUR
Retailer 2€881 EUR
Retailer 1€979 EUR
Retailer 3€1,020 EUR
Retailer 8€1,048 EUR
Wholesale Diamonds Direct€1,113 EUR
Retailer 11€1,118 EUR

32 data points across 12 retailers

9 retailers

Retailer 1
-
€687 EUR
$771 USD
Price last confirmed 16 days ago
Retailer 2
-
€720 EUR
SGD 1,091 SGD
View
Price last confirmed 11 days ago
Retailer 3
-
€748 EUR
SGD 1,134 SGD
View
Price last confirmed 15 days ago
Retailer 4
-
€764 EUR
$857 USD
View
Price last confirmed 13 days ago
Retailer 5
-
€772 EUR
$866 USD
View
Price last confirmed 13 days ago
Retailer 6
-
€798 EUR
£705 GBP
View
Price last confirmed 15 days ago
B+
Retailer 7
-
€901 EUR
$1,011 USD
View
Retailer 8
-
€979 EUR
£865 GBP
View
Price last confirmed 13 days ago
Most Expensive
Wholesale Diamonds Direct
272646166 · Oct 16
€1,113 EUR
$1,249 USD
View
Price last confirmed 17 days ago
8 more retailers have this diamond
Prices start from €901 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+
0.66ct Round
€901 EUR