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Round|Natural|GIA

1.66ct D I1 Round Natural Diamond

VG • D/I1 • GIA 3425140471

Certificate GIA 3425140471

Diamond specifications and retailer prices

From £6,446 GBP
$8,650 USD
As of November 2, 2026
Save £224 GBP (3%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £6,670 GBP at Yorxs · As of November 1, 2026
View at Yorxs

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 I1 clarity (included), with a very-good cut grade and certified by GIA 3425140471. Listed at 4 retailers as of November 1, 2026, with a relatively tight 3% spread, which is unusual at this carat range and suggests competitive pricing across the listings. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.66
Carat
D
Colour
I1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 3425140471
Dimensions7.53 × 7.62 × 4.69 mm
L/W Ratio1.01
Top View
7.53 mm7.62 mm1.66 ctD / I1
OriginNatural
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateGIA 3425140471
Side View
Table 59.0%CrownGirdle: THN-STKPavilionCulet: NoneDepth 62.0%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 2
Current: £6,446 GBP|Low: £6,446 GBP|High: £7,035 GBP|Avg: £6,695 GBP|-5.3%
Retailer 1
Retailer 2
Retailer 3
Yorxs
November 1, 2026
Retailer 1£6,446 GBP
Retailer 3£6,446 GBP
Retailer 2£6,662 GBP
Yorxs£6,670 GBP

26 data points across 4 retailers

4 retailers£6,446 GBP to £6,670 GBP

B
Cheapest Retailer
-
£6,446 GBP
$8,650 USD
B
Retailer 2
-
£6,446 GBP
$8,650 USD
View
B
Retailer 3
-
£6,662 GBP
$8,940 USD
View
Most Expensive
B
Yorxs
217974079 · Nov 1
£6,670 GBP
€8,524 EUR
View
3 more retailers have this diamond
Prices start from £6,446 GBPSave up to £224 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.

B
1.66ct Round
£6,446 GBP