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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 €646 EUR
$725 USD
As of November 2, 2026
6 retailers carry this diamond
Most expensive: €783 EUR at Wholesale Diamonds Direct · As of October 19, 2026
View at Wholesale Diamonds Direct

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 6 retailers as of November 2, 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
Colour
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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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: €714 EUR|Low: €466 EUR|High: €929 EUR|Avg: €719 EUR|-5.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Wholesale Diamonds Direct
October 22, 2026
Retailer 7€466 EUR
Retailer 4€509 EUR
Retailer 9€646 EUR
Retailer 6€674 EUR
Retailer 3€711 EUR
Retailer 1€714 EUR
Retailer 2€719 EUR
Wholesale Diamonds Direct€783 EUR
Retailer 8€861 EUR
Retailer 5€888 EUR

24 data points across 10 retailers

6 retailers

Retailer 1
-
€466 EUR
SGD 706 SGD
Price last confirmed 11 days ago
Retailer 2
-
€509 EUR
SGD 771 SGD
View
Price last confirmed 12 days ago
A
Retailer 3
-
€646 EUR
$725 USD
View
Retailer 4
-
€674 EUR
$756 USD
View
Price last confirmed 16 days ago
Retailer 5
-
€719 EUR
£635 GBP
View
Price last confirmed 12 days ago
Most Expensive
Wholesale Diamonds Direct
316735329 · Oct 19
€783 EUR
$879 USD
View
Price last confirmed 14 days ago
5 more retailers have this diamond
Prices start from €646 EUR

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
€646 EUR