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Round|Lab Grown|GIA

1.78ct D SI2 Round Lab Grown Diamond

EX • D/SI2 • GIA 2457007520

Certificate GIA 2457007520

Diamond specifications and retailer prices

From $729 NZD
$411 USD
As of October 29, 2026
Save $2,824 NZD (79%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $3,554 NZD at MOH London · As of October 29, 2026
View at MOH London

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 GIA 2457007520. Listed at 15 retailers as of October 29, 2026, with prices from $729 to $3,554, a $2,824 spread on the same certified stone. MOH London lists it at $3,554. 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
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.6°
OriginLab Grown
Grading LabGIA
CertificateGIA 2457007520
Dimensions7.80 × 7.78 × 4.80 mm
L/W Ratio1.00
Star length50%
Lower girdle75%
Top View
7.80 mm7.78 mm1.78 ctD / SI2
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2457007520
Side View
Table 56.0%Crown 35°Girdle: NUL-NULPavilion 40.6°Culet: NoneDepth 61.6%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: $3,554 NZD|Low: $701 NZD|High: $3,576 NZD|Avg: $1,572 NZD|+0.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 30, 2026
Retailer 10$729 NZD
Retailer 13$816 NZD
Retailer 5$905 NZD
Retailer 11$905 NZD
Retailer 4$1,224 NZD
Retailer 12$1,352 NZD
Retailer 6$1,352 NZD
Retailer 7$1,459 NZD
Retailer 9$1,597 NZD
Retailer 2$1,881 NZD
Retailer 8$2,197 NZD
Retailer 3$2,908 NZD
MOH London$3,554 NZD

44 data points across 13 retailers

15 retailers$729 NZD to $3,554 NZD

A
Cheapest Retailer
-
$729 NZD
$411 USD
A
Retailer 2
-
$816 NZD
$460 USD
View
A
Retailer 3
-
$905 NZD
$510 USD
View
A
Retailer 4
-
$905 NZD
$510 USD
View
A
Retailer 5
-
$999 NZD
HK$4,400 HKD
View
B+
Retailer 6
-
$1,224 NZD
$690 USD
View
B+
Retailer 7
-
$1,352 NZD
$762 USD
View
B+
Retailer 8
-
$1,352 NZD
£600 GBP
View
B+
Retailer 9
-
$1,459 NZD
€783 EUR
View
B+
Retailer 10
-
$1,597 NZD
$900 USD
View
B+
Retailer 11
-
$1,682 NZD
$948 USD
View
B+
Retailer 12
-
$1,881 NZD
$1,060 USD
View
B
Retailer 13
-
$2,197 NZD
$1,238 USD
View
B
Retailer 14
-
$2,908 NZD
$1,639 USD
View
Most Expensive
B
MOH London
2457007520 · Oct 29
$3,554 NZD
£1,577 GBP
View
14 more retailers have this diamond
Prices start from $729 NZDSave up to $2,824 NZD

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
1.78ct Round
$729 NZD