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0.66ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 2566134555

Certificate GIA 2566134555

Diamond specifications and retailer prices

From £555 GBP
$744 USD
As of October 31, 2026
Save £359 GBP (39%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £914 GBP at Frank Darling · As of November 2, 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2566134555. Listed at 11 retailers as of October 31, 2026, with prices from £555 to £914, a £359 spread on the same certified stone. Frank Darling lists it at £914. 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
FluorescenceNone
Crown angle32.5°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 2566134555
Dimensions5.67 × 5.71 × 3.42 mm
L/W Ratio1.01
Culet sizeNone
Top View
5.67 mm5.71 mm0.66 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2566134555
Side View
Table 59.0%Crown 32.5°Girdle: THN-MEDPavilion 41.4°Culet: NoneDepth 60.1%

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: £914 GBP|Low: £555 GBP|High: £943 GBP|Avg: £722 GBP|-3.1%
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 9£555 GBP
Retailer 6£583 GBP
Retailer 3£604 GBP
Retailer 10£617 GBP
Retailer 2£672 GBP
Retailer 4£697 GBP
Retailer 11£698 GBP
Retailer 7£795 GBP
Retailer 5£808 GBP
Retailer 8£895 GBP
Frank Darling£914 GBP

30 data points across 11 retailers

11 retailers£555 GBP to £914 GBP

A
Cheapest Retailer
-
£555 GBP
$744 USD
A
Retailer 2
-
£583 GBP
SGD 1,058 SGD
View
A
Retailer 3
-
£604 GBP
SGD 1,096 SGD
View
A
Retailer 4
-
£617 GBP
$828 USD
View
B+
Retailer 5
-
£672 GBP
View
B+
Retailer 6
-
£697 GBP
$935 USD
View
B+
Retailer 7
-
£698 GBP
$937 USD
View
B+
Retailer 8
-
£795 GBP
View
B+
Retailer 9
-
£808 GBP
€1,033 EUR
View
Retailer 10
-
£895 GBP
$1,201 USD
View
Price last confirmed 7 days ago
Most Expensive
B+
Frank Darling
2677081HK · Nov 2
£914 GBP
$1,226 USD
View
10 more retailers have this diamond
Prices start from £555 GBPSave up to £359 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
£555 GBP