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Round|Natural|GIA

6.18ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 2245040202

Certificate GIA 2245040202

Diamond specifications and retailer prices

From $165,392 NZD
$93,058 USD
As of November 2, 2026
Save $104,679 NZD (39%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $270,071 NZD at MOH London · As of November 2, 2026
View at MOH London

About this 6.18ct natural round diamond

This 6.18ct natural round sits in the over five carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2245040202. Listed at 8 retailers as of November 2, 2026, with prices from $165,392 to $270,071, a $104,679 spread on the same certified stone. MOH London lists it at $270,071. 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

6.18
Carat
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2245040202
Dimensions11.74 × 11.71 × 7.17 mm
L/W Ratio1.00
Star length50%
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Twinning Wisp, Cloud, Crystal, Feather, Needle
Top View
11.74 mm11.71 mm6.18 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2245040202
Side View
Table 59.0%Crown 35°Girdle: Slightly ThickPavilion 40.8°Culet: NoneDepth 61.2%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: $270,071 NZD|Low: $152,030 NZD|High: $271,517 NZD|Avg: $188,339 NZD|+7.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 3, 2026
Retailer 7$152,030 NZD
Retailer 4$165,392 NZD
Retailer 5$166,323 NZD
Retailer 2$173,730 NZD
Retailer 6$175,290 NZD
Retailer 8$182,594 NZD
Retailer 3$204,912 NZD
MOH London$270,071 NZD

13 data points across 8 retailers

8 retailers$165,392 NZD to $270,071 NZD

B+
Cheapest Retailer
-
$165,392 NZD
$93,058 USD
B+
Retailer 2
-
$166,323 NZD
$93,582 USD
View
B+
Retailer 3
-
$173,730 NZD
£76,968 GBP
View
B+
Retailer 4
-
$180,131 NZD
$101,351 USD
View
Retailer 5
-
$189,897 NZD
$106,846 USD
View
Price last confirmed 32 days ago
Retailer 6
-
$197,202 NZD
$110,956 USD
View
Price last confirmed 34 days ago
B
Retailer 7
-
$204,912 NZD
€109,804 EUR
View
Most Expensive
B
MOH London
C36C08406 · Nov 2
$270,071 NZD
£119,650 GBP
View
7 more retailers have this diamond
Prices start from $165,392 NZDSave up to $104,679 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.

B+
6.18ct Round
$165,392 NZD