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0.66ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 2566134555

Certificate GIA 2566134555

Diamond specifications and retailer prices

From $744 USD
As of October 31, 2026
Save $482 USD (39%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $1,226 USD at Frank Darling · As of November 2, 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2566134555. Listed at 11 retailers as of October 31, 2026, with prices from $744 to $1,226, a $482 spread on the same certified stone. Frank Darling lists it at $1,226. 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
Color
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.5°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 2566134555
Dimensions5.67 × 5.71 × 3.42 mm
L/W Ratio1.01
Culet sizeNone
Top View
5.67 mm5.71 mm0.66 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2566134555
Side View
Table 59.0%Crown 32.5°Girdle: THN-MEDPavilion 41.4°Culet: NoneDepth 60.1%

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: Oct 31
Current: $1,226 USD|Low: $744 USD|High: $1,265 USD|Avg: $969 USD|-3.1%
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 9$744 USD
Retailer 6$783 USD
Retailer 3$811 USD
Retailer 10$828 USD
Retailer 2$902 USD
Retailer 4$935 USD
Retailer 11$937 USD
Retailer 7$1,067 USD
Retailer 5$1,085 USD
Retailer 8$1,201 USD
Frank Darling$1,226 USD

30 data points across 11 retailers

11 retailers$744 USD to $1,226 USD

A
Cheapest Retailer
-
$744 USD
A
Retailer 2
-
$783 USD
SGD 1,058 SGD
View
A
Retailer 3
-
$811 USD
SGD 1,096 SGD
View
A
Retailer 4
-
$828 USD
View
B+
Retailer 5
-
$902 USD
£710 GBP
View
B+
Retailer 6
-
$935 USD
View
B+
Retailer 7
-
$937 USD
View
B+
Retailer 8
-
$1,067 USD
£840 GBP
View
B+
Retailer 9
-
$1,085 USD
€1,033 EUR
View
Retailer 10
-
$1,201 USD
View
Price last confirmed 7 days ago
Most Expensive
B+
Frank Darling
2677081HK · Nov 2
$1,226 USD
View
10 more retailers have this diamond
Prices start from $744 USDSave up to $482 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.

A
0.66ct Round
$744 USD