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Radiant|Natural|GIA

1.66ct D SI1 Radiant Natural Diamond

GD • D/SI1 • GIA 6197678456

Certificate GIA 6197678456

Diamond specifications and retailer prices

From $16,819 AUD
$11,787 USD
As of October 31, 2026
Save $1,488 AUD (8%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $18,307 AUD 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

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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: $18,307 AUD|Low: $16,819 AUD|High: $18,307 AUD|Avg: $17,744 AUD
Jared
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 2, 2026
Retailer 3$16,819 AUD
Retailer 4$17,722 AUD
Retailer 5$17,722 AUD
Retailer 2$18,252 AUD
Jared$18,307 AUD

18 data points across 5 retailers

5 retailers$16,819 AUD to $18,307 AUD

B
Cheapest Retailer
-
$16,819 AUD
$11,787 USD
B
Retailer 2
-
$17,722 AUD
$12,420 USD
View
B
Retailer 3
-
$17,722 AUD
$12,420 USD
View
B
Retailer 4
-
$18,252 AUD
€12,182 EUR
View
Most Expensive
B
Jared
120875943 · Nov 2
$18,307 AUD
$12,830 USD
View
4 more retailers have this diamond
Prices start from $16,819 AUDSave up to $1,488 AUD

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
$16,819 AUD