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0.66ct G SI2 Round Natural Diamond

EX • G/SI2 • GIA 1555028435

Certificate GIA 1555028435

Diamond specifications and retailer prices

From £396 GBP
SGD 719 SGD
As of October 31, 2026
Save £363 GBP (48%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £759 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 G colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1555028435. Listed at 8 retailers as of October 31, 2026, with prices from £396 to £759, a £363 spread on the same certified stone. Frank Darling lists it at £759. 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
G
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 1555028435
Dimensions5.55 × 3.48 × 3.48 mm
L/W Ratio1.59
Culet sizeNone
Top View
5.55 mm3.48 mm0.66 ctG / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1555028435
Side View
Table 58.0%Crown 36°Girdle: MED-STKPavilion 41.2°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: £759 GBP|Low: £396 GBP|High: £805 GBP|Avg: £633 GBP|-5.6%
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 1, 2026
Retailer 5£396 GBP
Retailer 6£444 GBP
Retailer 4£576 GBP
Retailer 2£621 GBP
Retailer 3£625 GBP
Retailer 7£665 GBP
Frank Darling£759 GBP
Retailer 8£764 GBP

33 data points across 8 retailers

8 retailers£396 GBP to £759 GBP

A
Cheapest Retailer
-
£396 GBP
SGD 719 SGD
A
Retailer 2
-
£444 GBP
SGD 805 SGD
View
A
Retailer 3
-
£575 GBP
$772 USD
View
A
Retailer 4
-
£576 GBP
$773 USD
View
A
Retailer 5
-
£621 GBP
€794 EUR
View
A
Retailer 6
-
£625 GBP
View
Retailer 7
-
£665 GBP
$893 USD
View
Price last confirmed 7 days ago
Most Expensive
B+
Frank Darling
2619666HK · Nov 2
£759 GBP
$1,019 USD
View
7 more retailers have this diamond
Prices start from £396 GBPSave up to £363 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
£396 GBP