Round|Natural|GIA

0.66ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 5556556629

Certificate GIA 5556556629

Diamond specifications and retailer prices

From £753 GBP
$1,011 USD
As of November 2, 2026
9 retailers carry this diamond
Most expensive: £931 GBP at Wholesale Diamonds Direct · As of October 16, 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 5556556629. Listed at 9 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 angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 5556556629
Dimensions5.57 × 3.48 × 3.48 mm
L/W Ratio1.60
Culet sizeNone
Top View
5.57 mm3.48 mm0.66 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5556556629
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.4%

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 2
Current: £819 GBP|Low: £575 GBP|High: £959 GBP|Avg: £774 GBP|-2.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Wholesale Diamonds Direct
October 20, 2026
Retailer 6£575 GBP
Retailer 7£602 GBP
Retailer 10£625 GBP
Retailer 9£639 GBP
Retailer 5£645 GBP
Retailer 4£667 GBP
Retailer 2£736 GBP
Retailer 1£819 GBP
Retailer 3£853 GBP
Retailer 8£876 GBP
Wholesale Diamonds Direct£931 GBP
Retailer 11£934 GBP

32 data points across 12 retailers

9 retailers

Retailer 1
-
£575 GBP
$771 USD
Price last confirmed 16 days ago
Retailer 2
-
£602 GBP
SGD 1,091 SGD
View
Price last confirmed 11 days ago
Retailer 3
-
£625 GBP
SGD 1,134 SGD
View
Price last confirmed 15 days ago
Retailer 4
-
£639 GBP
$857 USD
View
Price last confirmed 13 days ago
Retailer 5
-
£645 GBP
$866 USD
View
Price last confirmed 13 days ago
Retailer 6
-
£667 GBP
View
Price last confirmed 15 days ago
B+
Retailer 7
-
£753 GBP
$1,011 USD
View
Retailer 8
-
£819 GBP
View
Price last confirmed 13 days ago
Most Expensive
Wholesale Diamonds Direct
272646166 · Oct 16
£931 GBP
$1,249 USD
View
Price last confirmed 17 days ago
8 more retailers have this diamond
Prices start from £753 GBP

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
£753 GBP