CaratHunter
Plans
Round|Lab Grown|IGI

1.78ct D SI2 Round Lab Grown Diamond

ID • D/SI2

Diamond specifications and retailer prices

From $780 USD
As of October 25, 2026
1 retailer carries this diamond
Only listing: $780 USD at Rare Carat
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Rare Carat

About this 1.78ct lab-grown round diamond

This 1.78ct lab-grown round sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI. Listed at a single retailer as of October 25, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.78
Carat
D
Color
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
Dimensions7.71 × 7.74 × 0.00 mm
L/W Ratio1.00
Top View
7.71 mm7.74 mm1.78 ctD / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI
Side View
Table 58.0%CrownGirdle: MED-STKPavilionCuletDepth 62.5%

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 25
Current: $780 USD|Low: $460 USD|High: $799 USD|Avg: $625 USD|-2.3%
Rare Carat
Retailer 2
October 18, 2026
Retailer 2$460 USD
Rare Carat$780 USD

4 data points across 2 retailers

1 retailer

B
Rare Carat
LGDRD150-03774 · Oct 25
$780 USD
View

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
1.78ct Round
$780 USD