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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 $998 AUD
₹66,642 INR
As of November 2, 2026
Save $3,162 AUD (76%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $4,161 AUD 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 $998 to $4,161, a $3,162 spread on the same certified stone. NZ Jewellers lists it at $4,161. 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: $4,161 AUD|Low: $886 AUD|High: $4,161 AUD|Avg: $1,701 AUD
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$998 AUD
Retailer 4$1,039 AUD
Retailer 13$1,340 AUD
Retailer 10$1,341 AUD
Retailer 3$1,458 AUD
Retailer 12$1,517 AUD
Retailer 2$1,544 AUD
Retailer 7$1,717 AUD
Retailer 8$1,727 AUD
Retailer 5$1,890 AUD
Retailer 11$1,981 AUD
Retailer 9$2,430 AUD
NZ Jewellers$4,161 AUD

23 data points across 13 retailers

13 retailers$998 AUD to $4,161 AUD

A
Cheapest Retailer
-
$998 AUD
₹66,642 INR
A
Retailer 2
-
$1,039 AUD
$728 USD
View
Final sale: no returns
B+
Retailer 3
-
$1,340 AUD
$939 USD
View
B+
Retailer 4
-
$1,341 AUD
$940 USD
View
B+
Retailer 5
-
$1,458 AUD
$1,022 USD
View
B+
Retailer 6
-
$1,517 AUD
$1,063 USD
View
B+
Retailer 7
-
$1,544 AUD
£852 GBP
View
B+
Retailer 8
-
$1,717 AUD
£947 GBP
View
B+
Retailer 9
-
$1,727 AUD
€1,153 EUR
View
Retailer 10
-
$1,890 AUD
View
Price last confirmed 30 days ago
B
Retailer 11
-
$1,981 AUD
ZAR 22,433 ZAR
View
B
Retailer 12
-
$2,430 AUD
£1,341 GBP
View
Most Expensive
B
NZ Jewellers
32482787-982f-4cf7-b41c-92ed8cc2a066 · Oct 30
$4,161 AUD
$2,916 USD
View
12 more retailers have this diamond
Prices start from $998 AUDSave up to $3,162 AUD

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
$998 AUD