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0.66ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 3565704527

Certificate GIA 3565704527

Diamond specifications and retailer prices

From $634 USD
SGD 857 SGD
As of October 31, 2026
Save $519 USD (45%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $1,153 USD at Frank Darling · As of October 30, 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 3565704527. Listed at 10 retailers as of October 30, 2026, with prices from $634 to $1,153, a $519 spread on the same certified stone. Frank Darling lists it at $1,153. 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
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 3565704527
Dimensions5.53 × 3.47 × 3.47 mm
L/W Ratio1.59
Culet sizeNone
Top View
5.53 mm3.47 mm0.66 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 3565704527
Side View
Table 58.0%Crown 36.5°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.6%

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: $1,153 USD|Low: $736 USD|High: $1,153 USD|Avg: $940 USD
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 31, 2026
Retailer 9$736 USD
Retailer 7$773 USD
Retailer 2$818 USD
Retailer 8$956 USD
Retailer 6$984 USD
Retailer 3$993 USD
Retailer 5$1,028 USD
Retailer 4$1,098 USD
Frank Darling$1,153 USD

7 data points across 9 retailers

10 retailers$634 USD to $1,153 USD

A
Cheapest Retailer
-
$634 USD
SGD 857 SGD
A
Retailer 2
-
$736 USD
SGD 994 SGD
View
A
Retailer 3
-
$773 USD
View
A
Retailer 4
-
$818 USD
£644 GBP
View
B+
Retailer 5
-
$956 USD
View
B+
Retailer 6
-
$984 USD
£775 GBP
View
B+
Retailer 7
-
$993 USD
€946 EUR
View
B+
Retailer 8
-
$1,028 USD
View
B+
Retailer 9
-
$1,098 USD
View
Most Expensive
B
Frank Darling
2708874HK · Oct 30
$1,153 USD
View
9 more retailers have this diamond
Prices start from $634 USDSave up to $519 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
$634 USD