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Round|Natural|GIA

20.66ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 5234238312

Certificate GIA 5234238312

Diamond specifications and retailer prices

From $1,145,052 AUD
$802,475 USD
As of November 1, 2026
Save $313,700 AUD (22%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: $1,458,751 AUD at Yorxs · As of November 1, 2026
View at Yorxs

About this 20.66ct natural round diamond

This 20.66ct natural round sits in the over five carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5234238312. Listed at 4 retailers as of November 1, 2026, with prices from $1,145,052 to $1,458,751, a $313,700 spread on the same certified stone. Yorxs lists it at $1,458,751. 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

20.66
Carat
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
Crown angle32.5°
Pavilion angle41.8°
OriginNatural
Grading LabGIA
CertificateGIA 5234238312
Dimensions17.54 × 17.39 × 10.99 mm
L/W Ratio1.01
Star length45%
Lower girdle80%
Top View
17.54 mm17.39 mm20.66 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 5234238312
Side View
Table 57.0%Crown 32.5°Girdle: STK-STKPavilion 41.8°Culet: NoneDepth 62.9%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $1,146,825 AUD|Low: $1,109,900 AUD|High: $1,465,257 AUD|Avg: $1,215,390 AUD|-0.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Yorxs
November 1, 2026
Retailer 3$1,123,734 AUD
Retailer 2$1,145,052 AUD
Retailer 1$1,146,825 AUD
Retailer 4$1,194,629 AUD
Yorxs$1,458,751 AUD

29 data points across 5 retailers

4 retailers$1,145,052 AUD to $1,458,751 AUD

Retailer 1
-
$1,123,734 AUD
Price last confirmed 29 days ago
B
Retailer 2
-
$1,145,052 AUD
$802,475 USD
View
B
Retailer 3
-
$1,146,825 AUD
£632,849 GBP
View
Most Expensive
B
Yorxs
4438E07F5 · Nov 1
$1,458,751 AUD
€973,640 EUR
View
3 more retailers have this diamond
Prices start from $1,145,052 AUDSave up to $313,700 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.

B
20.66ct Round
$1,145,052 AUD