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0.66ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 6402283719

Certificate GIA 6402283719

Diamond specifications and retailer prices

From £343 GBP
HK$3,600 HKD
As of November 1, 2026
Save £850 GBP (71%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £1,194 GBP at Diamond Quarter · As of November 2, 2026
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 6402283719. Listed at 6 retailers as of November 1, 2026, with prices from £343 to £1,194, a £850 spread on the same certified stone. Diamond Quarter lists it at £1,194. 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
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle34.5°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 6402283719
Dimensions5.54 × 5.52 × 3.46 mm
L/W Ratio1.00
Top View
5.54 mm5.52 mm0.66 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6402283719
Side View
Table 61.0%Crown 34.5°Girdle: MED-MEDPavilion 41.6°Culet: NoneDepth 62.6%

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: Nov 1
Current: £631 GBP|Low: £306 GBP|High: £687 GBP|Avg: £506 GBP|-8.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 5£306 GBP
Retailer 4£343 GBP
Retailer 8£454 GBP
Retailer 6£516 GBP
Retailer 3£525 GBP
Retailer 2£580 GBP
Retailer 1£631 GBP
Retailer 7£663 GBP

10 data points across 8 retailers

6 retailers£343 GBP to £1,194 GBP

A
Cheapest Retailer
-
£343 GBP
HK$3,600 HKD
A
Retailer 2
-
£422 GBP
A$871 AUD
View
A
Retailer 3
-
£525 GBP
$704 USD
View
A
Retailer 4
-
£580 GBP
€741 EUR
View
A
Retailer 5
-
£631 GBP
View
Most Expensive
B
Diamond Quarter
0.66SI2H64193B4AN · Nov 2
£1,194 GBP
View
5 more retailers have this diamond
Prices start from £343 GBPSave up to £850 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.

A
0.66ct Round
£343 GBP