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Round|Natural|GIA

0.66ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6535595588

Certificate GIA 6535595588

Diamond specifications and retailer prices

From £429 GBP
HK$4,500 HKD
As of November 1, 2026
Save £620 GBP (59%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £1,050 GBP at MOH London · As of November 1, 2026
View at MOH London

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 6535595588. Listed at 11 retailers as of November 1, 2026, with prices from £429 to £1,050, a £620 spread on the same certified stone. MOH London lists it at £1,050. 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 angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 6535595588
Dimensions5.53 × 5.57 × 3.48 mm
L/W Ratio1.01
Top View
5.53 mm5.57 mm0.66 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6535595588
Side View
Table 59.0%Crown 35.5°Girdle: MED-STKPavilion 41.2°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: £1,050 GBP|Low: £420 GBP|High: £1,101 GBP|Avg: £744 GBP|-4.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 3, 2026
Retailer 5£429 GBP
Retailer 10£573 GBP
Retailer 8£582 GBP
Retailer 7£595 GBP
Retailer 9£657 GBP
Retailer 3£672 GBP
Retailer 2£680 GBP
Retailer 4£808 GBP
Retailer 6£856 GBP
Retailer 11£862 GBP
MOH London£1,050 GBP

43 data points across 11 retailers

11 retailers£429 GBP to £1,050 GBP

A
Cheapest Retailer
-
£429 GBP
HK$4,500 HKD
A
Retailer 2
-
£573 GBP
$769 USD
View
A
Retailer 3
-
£582 GBP
$781 USD
View
Retailer 4
-
£595 GBP
SGD 1,079 SGD
View
Price last confirmed 7 days ago
B+
Retailer 5
-
£657 GBP
$881 USD
View
B+
Retailer 6
-
£672 GBP
$902 USD
View
B+
Retailer 7
-
£680 GBP
View
B+
Retailer 8
-
£808 GBP
€1,033 EUR
View
B+
Retailer 9
-
£856 GBP
ZAR 18,558 ZAR
View
Retailer 10
-
£862 GBP
A$1,780 AUD
View
Price last confirmed 30 days ago
Most Expensive
B
MOH London
713A3B4D4 · Nov 1
£1,050 GBP
View
10 more retailers have this diamond
Prices start from £429 GBPSave up to £620 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
£429 GBP