CaratHunter
Plans
Radiant|Natural|GIA

1.66ct D SI1 Radiant Natural Diamond

GD • D/SI1 • GIA 6197678456

Certificate GIA 6197678456

Diamond specifications and retailer prices

From £8,784 GBP
$11,787 USD
As of October 31, 2026
Save £777 GBP (8%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £9,561 GBP at Jared · As of November 2, 2026
View at Jared

About this 1.66ct natural radiant diamond

This 1.66ct natural radiant sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 6197678456. Listed at 5 retailers as of October 31, 2026, with a relatively tight 9% 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
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishVery Good
SymmetryGood
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 6197678456
Dimensions6.85 × 6.63 × 4.55 mm
L/W Ratio1.03
Top View
6.85 mm6.63 mm1.66 ctD / SI1
OriginNatural
CutGood
PolishVery Good
SymmetryGood
FluorescenceMedium
CertificateGIA 6197678456
Side View
Table 76.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 68.6%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: £9,561 GBP|Low: £8,784 GBP|High: £9,561 GBP|Avg: £9,267 GBP
Jared
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 2, 2026
Retailer 3£8,784 GBP
Retailer 4£9,255 GBP
Retailer 5£9,255 GBP
Retailer 2£9,532 GBP
Jared£9,561 GBP

18 data points across 5 retailers

5 retailers£8,784 GBP to £9,561 GBP

B
Cheapest Retailer
-
£8,784 GBP
$11,787 USD
B
Retailer 2
-
£9,255 GBP
$12,420 USD
View
B
Retailer 3
-
£9,255 GBP
$12,420 USD
View
B
Retailer 4
-
£9,532 GBP
€12,182 EUR
View
Most Expensive
B
Jared
120875943 · Nov 2
£9,561 GBP
$12,830 USD
View
4 more retailers have this diamond
Prices start from £8,784 GBPSave up to £777 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 Radiant
£8,784 GBP