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1.65ct F SI1 Round Natural Diamond

EX • F/SI1 • IGI 817651632

Shape and cutting style on the report: Round brilliant

Certificate IGI 817651632

Diamond specifications and retailer prices

From $8,116 USD
£6,390 GBP
As of November 3, 2026
Save $3,939 USD (33%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $12,055 USD at MOH London · As of November 2, 2026
View at MOH London

About this 1.65ct natural round diamond

This 1.65ct 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 IGI 817651632. Listed at 3 retailers as of November 2, 2026, with prices from $8,116 to $12,055, a $3,939 spread on the same certified stone. MOH London lists it at $12,055. 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

1.65
Carat
F
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.1°
Pavilion angle40.1°
OriginNatural
Grading LabIGI
CertificateIGI 817651632
Dimensions7.69 × 7.73 × 4.51 mm
L/W Ratio1.01
Girdle conditionFaceted
Top View
7.69 mm7.73 mm1.65 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 817651632
Side View
Table 61.0%Crown 33.1°Girdle: MediumPavilion 40.1°CuletDepth 58.5%

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 3
Current: $12,055 USD|Low: $7,725 USD|High: $12,201 USD|Avg: $9,719 USD
MOH London
Retailer 2
Retailer 3
November 3, 2026
Retailer 2$8,116 USD
Retailer 3$8,925 USD
MOH London$12,055 USD

33 data points across 3 retailers

3 retailers$8,116 USD to $12,055 USD

B+
Cheapest Retailer
-
$8,116 USD
£6,390 GBP
B+
Retailer 2
-
$8,925 USD
€8,500 EUR
View
Most Expensive
B
MOH London
BCB97A1E9 · Nov 2
$12,055 USD
£9,492 GBP
View
2 more retailers have this diamond
Prices start from $8,116 USDSave up to $3,939 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+
1.65ct Round
$8,116 USD