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0.66ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 5241025206

Certificate GIA 5241025206

Diamond specifications and retailer prices

From €573 EUR
SGD 868 SGD
As of October 31, 2026
Save €464 EUR (45%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: €1,037 EUR at Frank Darling · As of November 3, 2026
View at Frank Darling

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 5241025206. Listed at 12 retailers as of October 31, 2026, with prices from €573 to €1,037, a €464 spread on the same certified stone. Frank Darling lists it at €1,037. 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
FluorescenceFaint
Crown angle34.5°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 5241025206
Dimensions5.57 × 5.58 × 3.49 mm
L/W Ratio1.00
Culet sizeNone
Top View
5.57 mm5.58 mm0.66 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 5241025206
Side View
Table 56.0%Crown 34.5°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 62.5%

Caratlytics Score

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

Price History

Last verified: Oct 31
Current: €1,037 EUR|Low: €573 EUR|High: €1,067 EUR|Avg: €804 EUR|-2.8%
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 3, 2026
Retailer 6€573 EUR
Retailer 11€624 EUR
Retailer 4€664 EUR
Retailer 3€680 EUR
Retailer 9€697 EUR
Retailer 5€740 EUR
Retailer 10€864 EUR
Retailer 7€889 EUR
Retailer 2€892 EUR
Retailer 12€929 EUR
Retailer 8€993 EUR
Frank Darling€1,037 EUR

44 data points across 12 retailers

12 retailers€573 EUR to €1,037 EUR

A
Cheapest Retailer
-
€573 EUR
SGD 868 SGD
A
Retailer 2
-
€624 EUR
$700 USD
View
A
Retailer 3
-
€664 EUR
SGD 1,006 SGD
View
A
Retailer 4
-
€680 EUR
$763 USD
View
A
Retailer 5
-
€697 EUR
$782 USD
View
A
Retailer 6
-
€740 EUR
£653 GBP
View
B+
Retailer 7
-
€864 EUR
$969 USD
View
B+
Retailer 8
-
€889 EUR
£785 GBP
View
B+
Retailer 9
-
€892 EUR
View
B+
Retailer 10
-
€929 EUR
$1,042 USD
View
Retailer 11
-
€993 EUR
$1,114 USD
View
Price last confirmed 7 days ago
Most Expensive
B+
Frank Darling
2669868HK · Nov 3
€1,037 EUR
$1,163 USD
View
11 more retailers have this diamond
Prices start from €573 EURSave up to €464 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
0.66ct Round
€573 EUR