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Round|Natural|GIA

0.66ct M SI2 Round Natural Diamond

EX • M/SI2 • GIA 5503478758

Certificate GIA 5503478758

Diamond specifications and retailer prices

From $606 USD
As of November 6, 2026
Save $116 USD (16%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $1,912 USD at NZ Jewellers · As of September 24, 2026
View at NZ Jewellers

About this 0.66ct natural round diamond

This 0.66ct natural round sits in the half to three-quarter carat band, graded M colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5503478758. Listed at 7 retailers as of November 5, 2026, with a relatively tight 19% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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
M
Color
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 5503478758
Dimensions5.51 × 5.53 × 3.46 mm
L/W Ratio1.00
Star length50%
Lower girdle75%
Top View
5.51 mm5.53 mm0.66 ctM / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5503478758
Side View
Table 58.0%Crown 36°GirdlePavilion 40.8°Culet: NoneDepth 62.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $606 USD|Low: $606 USD|High: $745 USD|Avg: $699 USD|-4.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
November 6, 2026
Retailer 1$606 USD
Retailer 4$698 USD
Retailer 2$722 USD
Retailer 3$725 USD

36 data points across 4 retailers

7 retailers$606 USD to $722 USD

Retailer 1
-
$499 USD
Price last confirmed 29 days ago
Retailer 2
-
$537 USD
View
Price last confirmed 29 days ago
Retailer 3
-
$537 USD
View
Price last confirmed 38 days ago
Retailer 4
-
$576 USD
View
Price last confirmed 38 days ago
B+
Retailer 5
-
$606 USD
View
B
Retailer 6
-
$722 USD
View
Most Expensive
NZ Jewellers
15ff43c4-a07b-4042-be2b-1ac38cb2d21b · Sep 24
$1,912 USD
View
Price under review
6 more retailers have this diamond
Prices start from $606 USDSave up to $116 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.

B+
0.66ct Round
$606 USD