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Round|Natural|GIA

0.66ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 5241025206

Certificate GIA 5241025206

Diamond specifications and retailer prices

From $642 USD
SGD 868 SGD
As of October 31, 2026
Save $521 USD (45%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,163 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 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 $642 to $1,163, a $521 spread on the same certified stone. Frank Darling lists it at $1,163. 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
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: $1,163 USD|Low: $642 USD|High: $1,196 USD|Avg: $903 USD|-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 2, 2026
Retailer 6$642 USD
Retailer 11$700 USD
Retailer 4$744 USD
Retailer 3$763 USD
Retailer 9$782 USD
Retailer 2$830 USD
Retailer 10$969 USD
Retailer 7$997 USD
Retailer 5$1,000 USD
Retailer 12$1,042 USD
Retailer 8$1,114 USD
Frank Darling$1,163 USD

44 data points across 12 retailers

12 retailers$642 USD to $1,163 USD

A
Cheapest Retailer
-
$642 USD
SGD 868 SGD
A
Retailer 2
-
$700 USD
View
A
Retailer 3
-
$744 USD
SGD 1,006 SGD
View
A
Retailer 4
-
$763 USD
View
A
Retailer 5
-
$782 USD
View
A
Retailer 6
-
$830 USD
£653 GBP
View
B+
Retailer 7
-
$969 USD
View
B+
Retailer 8
-
$997 USD
£785 GBP
View
B+
Retailer 9
-
$1,000 USD
€952 EUR
View
B+
Retailer 10
-
$1,042 USD
View
Retailer 11
-
$1,114 USD
View
Price last confirmed 7 days ago
Most Expensive
B+
Frank Darling
2669868HK · Nov 2
$1,163 USD
View
11 more retailers have this diamond
Prices start from $642 USDSave up to $521 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
$642 USD