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Round|Natural|GIA

0.66ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 5241025206

Certificate GIA 5241025206

Diamond specifications and retailer prices

From £479 GBP
SGD 868 SGD
As of October 31, 2026
Save £388 GBP (45%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £867 GBP at Frank Darling · As of November 3, 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 5241025206. Listed at 12 retailers as of October 31, 2026, with prices from £479 to £867, a £388 spread on the same certified stone. Frank Darling lists it at £867. 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
FluorescenceFaint
Crown angle34.5°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 5241025206
Dimensions5.57 × 5.58 × 3.49 mm
L/W Ratio1.00
Culet sizeNone
Top View
5.57 mm5.58 mm0.66 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 5241025206
Side View
Table 56.0%Crown 34.5°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 62.5%

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: £867 GBP|Low: £479 GBP|High: £891 GBP|Avg: £672 GBP|-2.8%
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 3, 2026
Retailer 6£479 GBP
Retailer 11£522 GBP
Retailer 4£555 GBP
Retailer 3£569 GBP
Retailer 9£583 GBP
Retailer 5£618 GBP
Retailer 10£722 GBP
Retailer 7£743 GBP
Retailer 2£746 GBP
Retailer 12£776 GBP
Retailer 8£830 GBP
Frank Darling£867 GBP

44 data points across 12 retailers

12 retailers£479 GBP to £867 GBP

A
Cheapest Retailer
-
£479 GBP
SGD 868 SGD
A
Retailer 2
-
£522 GBP
$700 USD
View
A
Retailer 3
-
£555 GBP
SGD 1,006 SGD
View
A
Retailer 4
-
£569 GBP
$763 USD
View
A
Retailer 5
-
£583 GBP
$782 USD
View
A
Retailer 6
-
£618 GBP
View
B+
Retailer 7
-
£722 GBP
$969 USD
View
B+
Retailer 8
-
£743 GBP
View
B+
Retailer 9
-
£746 GBP
€953 EUR
View
B+
Retailer 10
-
£776 GBP
$1,042 USD
View
Retailer 11
-
£830 GBP
$1,114 USD
View
Price last confirmed 7 days ago
Most Expensive
B+
Frank Darling
2669868HK · Nov 3
£867 GBP
$1,163 USD
View
11 more retailers have this diamond
Prices start from £479 GBPSave up to £388 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
£479 GBP