CaratHunter
Plans
Round|Natural|GIA

0.66ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1555153399

Certificate GIA 1555153399

Diamond specifications and retailer prices

From £674 GBP
$905 USD
As of November 1, 2026
Save £1,417 GBP (68%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £2,091 GBP at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

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 1555153399. Listed at 12 retailers as of October 30, 2026, with prices from £674 to £2,091, a £1,417 spread on the same certified stone. NZ Jewellers lists it at £2,091. 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
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 1555153399
Dimensions5.62 × 5.58 × 3.45 mm
L/W Ratio1.01
Culet sizeNone
Top View
5.62 mm5.58 mm0.66 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1555153399
Side View
Table 57.0%CrownGirdle: MED-SLIPavilionCulet: NoneDepth 61.6%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £2,091 GBP|Low: £634 GBP|High: £2,091 GBP|Avg: £938 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 3, 2026
Retailer 8£674 GBP
Retailer 7£692 GBP
Retailer 2£769 GBP
Retailer 6£770 GBP
Retailer 9£786 GBP
Retailer 3£936 GBP
Retailer 10£940 GBP
Retailer 5£996 GBP
Retailer 4£1,222 GBP
NZ Jewellers£2,091 GBP

45 data points across 10 retailers

12 retailers£674 GBP to £2,091 GBP

Retailer 1
-
£622 GBP
$835 USD
Price last confirmed 39 days ago
Retailer 2
-
£625 GBP
$839 USD
View
Price last confirmed 49 days ago
B+
Retailer 3
-
£674 GBP
$905 USD
View
B+
Retailer 4
-
£692 GBP
$929 USD
View
B+
Retailer 5
-
£769 GBP
View
Retailer 6
-
£770 GBP
$1,033 USD
View
Price last confirmed 7 days ago
B+
Retailer 7
-
£786 GBP
$1,055 USD
View
B+
Retailer 8
-
£936 GBP
€1,196 EUR
View
Retailer 9
-
£940 GBP
A$1,941 AUD
View
Price last confirmed 29 days ago
B
Retailer 10
-
£996 GBP
ZAR 21,591 ZAR
View
B
Retailer 11
-
£1,222 GBP
View
Most Expensive
B
NZ Jewellers
3885b89d-0411-49f5-951e-d22d72438c8e · Oct 30
£2,091 GBP
$2,806 USD
View
11 more retailers have this diamond
Prices start from £674 GBPSave up to £1,417 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.

B+
0.66ct Round
£674 GBP