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0.66ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 3565704527

Certificate GIA 3565704527

Diamond specifications and retailer prices

From £473 GBP
SGD 857 SGD
As of October 31, 2026
Save £387 GBP (45%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £860 GBP at Frank Darling · As of October 30, 2026
View at Frank Darling

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 3565704527. Listed at 10 retailers as of October 30, 2026, with prices from £473 to £860, a £387 spread on the same certified stone. Frank Darling lists it at £860. 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 3565704527
Dimensions5.53 × 3.47 × 3.47 mm
L/W Ratio1.59
Culet sizeNone
Top View
5.53 mm3.47 mm0.66 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 3565704527
Side View
Table 58.0%Crown 36.5°Girdle: MED-STKPavilion 41°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: Oct 31
Current: £860 GBP|Low: £548 GBP|High: £860 GBP|Avg: £701 GBP
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 31, 2026
Retailer 9£548 GBP
Retailer 7£576 GBP
Retailer 2£610 GBP
Retailer 8£712 GBP
Retailer 6£733 GBP
Retailer 3£740 GBP
Retailer 5£766 GBP
Retailer 4£818 GBP
Frank Darling£860 GBP

7 data points across 9 retailers

10 retailers£473 GBP to £860 GBP

A
Cheapest Retailer
-
£473 GBP
SGD 857 SGD
A
Retailer 2
-
£548 GBP
SGD 994 SGD
View
A
Retailer 3
-
£576 GBP
$773 USD
View
A
Retailer 4
-
£610 GBP
View
B+
Retailer 5
-
£712 GBP
$956 USD
View
B+
Retailer 6
-
£733 GBP
View
B+
Retailer 7
-
£740 GBP
€946 EUR
View
B+
Retailer 8
-
£766 GBP
$1,028 USD
View
B+
Retailer 9
-
£818 GBP
$1,098 USD
View
Most Expensive
B
Frank Darling
2708874HK · Oct 30
£860 GBP
$1,153 USD
View
9 more retailers have this diamond
Prices start from £473 GBPSave up to £387 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
£473 GBP