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Round|Lab Grown|IGI

1.68ct D IF Round Lab Grown Diamond

ID • D/IF • IGI LG780668507

Shape and cutting style on the report: Round brilliant

Certificate IGI LG780668507

Diamond specifications and retailer prices

From £472 GBP
$632 USD
As of October 30, 2026
Save £847 GBP (64%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £1,825 GBP at Rare Carat · As of October 25, 2026
View at Rare Carat

About this 1.68ct lab-grown round diamond

This 1.68ct lab-grown 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 IGI LG780668507 or 780668507. Listed at 8 retailers as of October 29, 2026, with a 180% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.68
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.1°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780668507
Dimensions7.71 × 7.67 × 4.68 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.71 mm7.67 mm1.68 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780668507
Side View
Table 57.0%Crown 34.1°Girdle: MediumPavilion 40.7°Culet: NoneDepth 60.8%

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: Oct 30
Current: £1,825 GBP|Low: £472 GBP|High: £1,862 GBP|Avg: £982 GBP|-2.0%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 1, 2026
Retailer 6£472 GBP
Retailer 4£541 GBP
Retailer 2£604 GBP
Retailer 3£830 GBP
Retailer 7£877 GBP
Retailer 8£1,109 GBP
Retailer 5£1,318 GBP
Rare Carat£1,825 GBP

38 data points across 8 retailers

8 retailers£472 GBP to £1,318 GBP

A
Cheapest Retailer
-
£472 GBP
$632 USD
A
Retailer 2
-
£541 GBP
€690 EUR
View
A
Retailer 3
-
£604 GBP
View
B+
Retailer 4
-
£830 GBP
$1,112 USD
View
B+
Retailer 5
-
£877 GBP
$1,175 USD
View
B+
Retailer 6
-
£1,109 GBP
$1,486 USD
View
B+
Retailer 7
-
£1,318 GBP
View
Most Expensive
Rare Carat
C91-4A · Oct 25
£1,825 GBP
$2,445 USD
View
Price last confirmed 7 days ago
7 more retailers have this diamond
Prices start from £472 GBPSave up to £847 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
1.68ct Round
£472 GBP