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Round|Natural|GIA

0.66ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1543990421

Certificate GIA 1543990421

Diamond specifications and retailer prices

From $1,013 CAD
$725 USD
As of October 31, 2026
8 retailers carry this diamond
Most expensive: $1,391 CAD at Frank Darling · As of October 21, 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 1543990421. Listed at 8 retailers as of October 31, 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
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1543990421
Dimensions5.53 × 5.56 × 3.47 mm
L/W Ratio1.01
Culet sizeNone
Top View
5.53 mm5.56 mm0.66 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1543990421
Side View
Table 57.0%Crown 36.5°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.6%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 31
Current: $1,391 CAD|Low: $730 CAD|High: $1,456 CAD|Avg: $1,127 CAD|-4.4%
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 22, 2026
Retailer 7$730 CAD
Retailer 5$797 CAD
Retailer 10$1,013 CAD
Retailer 6$1,057 CAD
Retailer 4$1,115 CAD
Retailer 2$1,120 CAD
Retailer 3$1,127 CAD
Retailer 8$1,228 CAD
Retailer 9$1,349 CAD
Frank Darling$1,391 CAD

24 data points across 10 retailers

8 retailers

Retailer 1
-
$730 CAD
SGD 706 SGD
Price last confirmed 11 days ago
Retailer 2
-
$797 CAD
SGD 771 SGD
View
Price last confirmed 12 days ago
A
Retailer 3
-
$1,013 CAD
$725 USD
View
Retailer 4
-
$1,057 CAD
$756 USD
View
Price last confirmed 16 days ago
Retailer 5
-
$1,120 CAD
€763 EUR
View
Price last confirmed 11 days ago
Retailer 6
-
$1,127 CAD
£635 GBP
View
Price last confirmed 12 days ago
Retailer 7
-
$1,228 CAD
$879 USD
View
Price last confirmed 14 days ago
Most Expensive
Frank Darling
2617419HK · Oct 21
$1,391 CAD
$996 USD
View
Price last confirmed 12 days ago
7 more retailers have this diamond
Prices start from $1,013 CAD

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
$1,013 CAD