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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 £18,025 GBP
$24,152 USD
As of October 31, 2026
Save £3,289 GBP (15%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £21,314 GBP 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 £18,025 to £21,314, a £3,289 spread on the same certified stone. Blue Nile lists it at £21,314. 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

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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: Oct 31
Current: £21,314 GBP|Low: £18,025 GBP|High: £21,314 GBP|Avg: £19,800 GBP
Blue Nile
Retailer 2
Retailer 3
October 9, 2026
Retailer 2£18,025 GBP
Retailer 3£19,382 GBP
Blue Nile£21,314 GBP

3 data points across 3 retailers

3 retailers£18,025 GBP to £21,314 GBP

A
Cheapest Retailer
-
£18,025 GBP
$24,152 USD
B+
Retailer 2
-
£19,382 GBP
$25,969 USD
View
Most Expensive
B+
Blue Nile
26210850 · Oct 31
£21,314 GBP
$28,559 USD
View
2 more retailers have this diamond
Prices start from £18,025 GBPSave up to £3,289 GBP

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
£18,025 GBP