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Round|Natural|GIA

1.66ct D IF Round Natural Diamond

ID • D/IF • GIA 619

Certificate GIA 619

Diamond specifications and retailer prices

From $30,876 SGD
$24,152 USD
As of November 2, 2026
Save $5,634 SGD (15%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $36,510 SGD at Blue Nile · As of October 31, 2026
View at Blue Nile

About this 1.66ct natural round diamond

This 1.66ct natural round sits in the one-and-a-half to two carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by GIA. Listed at 3 retailers as of October 31, 2026, with prices from $30,876 to $36,510, a $5,634 spread on the same certified stone. Blue Nile lists it at $36,510. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.66
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 619
Dimensions7.63 × 7.66 × 4.66 mm
L/W Ratio1.00
Top View
7.63 mm7.66 mm1.66 ctD / IF
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 619
Side View
Table 57.0%CrownGirdle: THN-MEDPavilionCulet: NoneDepth 61.0%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: $36,510 SGD|Low: $30,876 SGD|High: $36,510 SGD|Avg: $33,916 SGD
Blue Nile
Retailer 2
Retailer 3
October 9, 2026
Retailer 2$30,876 SGD
Retailer 3$33,199 SGD
Blue Nile$36,510 SGD

3 data points across 3 retailers

3 retailers$30,876 SGD to $36,510 SGD

A
Cheapest Retailer
-
$30,876 SGD
$24,152 USD
B+
Retailer 2
-
$33,199 SGD
$25,969 USD
View
Most Expensive
B+
Blue Nile
26210850 · Oct 31
$36,510 SGD
$28,559 USD
View
2 more retailers have this diamond
Prices start from $30,876 SGDSave up to $5,634 SGD

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
1.66ct Round
$30,876 SGD