Round|Natural|GIA

1.64ct F SI1 Round Natural Diamond

EX • F/SI1 • GIA 6505166190

Certificate GIA 6505166190

Diamond specifications and retailer prices

From $8,777 USD
As of November 1, 2026
Save $7,625 USD (46%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $16,402 USD at NZ Jewellers · As of November 2, 2026
View at NZ Jewellers

About this 1.64ct natural round diamond

This 1.64ct natural round sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6505166190. Listed at 6 retailers as of November 1, 2026, with prices from $8,777 to $16,402, a $7,625 spread on the same certified stone. NZ Jewellers lists it at $16,402. 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

1.64
Carat
F
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6505166190
Dimensions7.47 × 7.51 × 4.71 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
7.47 mm7.51 mm1.64 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6505166190
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.9%

Caratlytics Score

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

Price History

Last verified: Nov 1
Current: $16,402 USD|Low: $7,224 USD|High: $16,402 USD|Avg: $11,458 USD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 2, 2026
Retailer 5$8,777 USD
Retailer 4$9,052 USD
Retailer 2$10,251 USD
Retailer 3$13,666 USD
NZ Jewellers$16,402 USD

24 data points across 5 retailers

6 retailers$8,777 USD to $16,402 USD

B+
Cheapest Retailer
-
$8,777 USD
B+
Retailer 2
-
$9,052 USD
View
Final sale: no returns
B+
Retailer 3
-
$10,251 USD
€9,763 EUR
View
B
Retailer 4
-
$13,666 USD
£10,761 GBP
View
B
Retailer 5
-
$16,111 USD
£12,686 GBP
View
Most Expensive
B
NZ Jewellers
3fb6f9f3-83ae-47fe-9c61-f481b0b722a0 · Nov 2
$16,402 USD
View
5 more retailers have this diamond
Prices start from $8,777 USDSave up to $7,625 USD

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+
1.64ct Round
$8,777 USD