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Round|Natural|GIA

0.66ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 2221897311

Certificate GIA 2221897311

Diamond specifications and retailer prices

From £1,397 GBP
As of November 2, 2026
4 retailers carry this diamond
Most expensive: £1,397 GBP at Diamond Quarter
View at Diamond Quarter

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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2221897311. Listed at 4 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 2221897311
Dimensions5.57 × 5.52 × 3.47 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Culet sizeNone
Top View
5.57 mm5.52 mm0.66 ctH / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateGIA 2221897311
Side View
Table 58.0%Crown 35.5°Girdle: THN-STKPavilion 41.2°Culet: NoneDepth 62.6%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 2
Current: £609 GBP|Low: £298 GBP|High: £1,201 GBP|Avg: £672 GBP|+2.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 12, 2026
Retailer 4£298 GBP
Retailer 3£522 GBP
Retailer 1£609 GBP
Retailer 5£666 GBP
Retailer 6£773 GBP
Retailer 2£1,201 GBP

18 data points across 6 retailers

4 retailers

Retailer 1
-
£522 GBP
$700 USD
Price last confirmed 26 days ago
Retailer 2
-
£609 GBP
View
Price last confirmed 21 days ago
Retailer 3
-
£1,201 GBP
View
Price last confirmed 22 days ago
Most Expensive
B
Diamond Quarter
0.66SI2H221130A1N · Nov 2
£1,397 GBP
View
3 more retailers have this diamond

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
£1,397 GBP