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Round|Natural|GIA

0.66ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 2557966125

Certificate GIA 2557966125

Diamond specifications and retailer prices

From £521 GBP
₹66,642 INR
As of November 2, 2026
Save £1,652 GBP (76%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £2,173 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 2557966125. Listed at 13 retailers as of October 30, 2026, with prices from £521 to £2,173, a £1,652 spread on the same certified stone. NZ Jewellers lists it at £2,173. 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 2557966125
Dimensions5.58 × 5.55 × 3.49 mm
L/W Ratio1.01
Girdle conditionSlightly Thick
Top View
5.58 mm5.55 mm0.66 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557966125
Side View
Table 56.0%Crown 35.5°Girdle: ThinPavilion 41.2°Culet: NoneDepth 62.7%

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 2
Current: £2,173 GBP|Low: £463 GBP|High: £2,173 GBP|Avg: £888 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 3, 2026
Retailer 6£521 GBP
Retailer 4£542 GBP
Retailer 13£700 GBP
Retailer 10£700 GBP
Retailer 3£762 GBP
Retailer 12£792 GBP
Retailer 2£806 GBP
Retailer 7£897 GBP
Retailer 8£902 GBP
Retailer 5£987 GBP
Retailer 11£1,035 GBP
Retailer 9£1,269 GBP
NZ Jewellers£2,173 GBP

23 data points across 13 retailers

13 retailers£521 GBP to £2,173 GBP

A
Cheapest Retailer
-
£521 GBP
₹66,642 INR
A
Retailer 2
-
£542 GBP
$728 USD
View
Final sale: no returns
B+
Retailer 3
-
£700 GBP
$939 USD
View
B+
Retailer 4
-
£700 GBP
$940 USD
View
B+
Retailer 5
-
£762 GBP
$1,022 USD
View
B+
Retailer 6
-
£792 GBP
$1,063 USD
View
B+
Retailer 7
-
£806 GBP
View
B+
Retailer 8
-
£897 GBP
View
B+
Retailer 9
-
£902 GBP
€1,153 EUR
View
Retailer 10
-
£987 GBP
A$2,038 AUD
View
Price last confirmed 30 days ago
B
Retailer 11
-
£1,035 GBP
ZAR 22,433 ZAR
View
B
Retailer 12
-
£1,269 GBP
View
Most Expensive
B
NZ Jewellers
32482787-982f-4cf7-b41c-92ed8cc2a066 · Oct 30
£2,173 GBP
$2,916 USD
View
12 more retailers have this diamond
Prices start from £521 GBPSave up to £1,652 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
£521 GBP