Round|Natural|GIA

6.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 2544916426

Certificate GIA 2544916426

Diamond specifications and retailer prices

From $146,634 NZD
$82,504 USD
As of November 2, 2026
Save $36,858 NZD (20%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $183,492 NZD at 77 Diamonds · As of November 2, 2026
View at 77 Diamonds

About this 6.51ct natural round diamond

This 6.51ct natural round sits in the over five carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2544916426. Listed at 8 retailers as of November 2, 2026, with prices from $146,634 to $183,492, a $36,858 spread on the same certified stone. 77 Diamonds lists it at $183,492. 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

6.51
Carat
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
Crown angle34.5°
Pavilion angle41.8°
OriginNatural
Grading LabGIA
CertificateGIA 2544916426
Dimensions11.83 × 11.93 × 7.46 mm
L/W Ratio1.01
Star length50%
Top View
11.83 mm11.93 mm6.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 2544916426
Side View
Table 59.0%Crown 34.5°Girdle: MED-STKPavilion 41.8°Culet: NoneDepth 62.8%

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: Nov 2
Current: $183,492 NZD|Low: $146,634 NZD|High: $200,090 NZD|Avg: $166,991 NZD|+0.4%
77 Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 2, 2026
Retailer 6$146,634 NZD
Retailer 3$152,659 NZD
Retailer 2$153,980 NZD
Retailer 5$161,430 NZD
77 Diamonds$183,492 NZD
Retailer 4$199,633 NZD

37 data points across 6 retailers

8 retailers$146,634 NZD to $183,492 NZD

A
Cheapest Retailer
-
$146,634 NZD
$82,504 USD
Retailer 2
-
$151,774 NZD
$85,396 USD
View
Price last confirmed 11 days ago
Retailer 3
-
$152,659 NZD
₹8,180,371 INR
View
Price last confirmed 11 days ago
Retailer 4
-
$153,196 NZD
$86,196 USD
View
Price last confirmed 10 days ago
B+
Retailer 5
-
$153,980 NZD
$86,637 USD
View
Retailer 6
-
$161,430 NZD
$90,829 USD
View
Price last confirmed 14 days ago
Retailer 7
-
$169,773 NZD
$95,523 USD
View
Price last confirmed 11 days ago
Most Expensive
B+
77 Diamonds
RBMBNUGEQWBT · Nov 2
$183,492 NZD
£81,293 GBP
View
7 more retailers have this diamond
Prices start from $146,634 NZDSave up to $36,858 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
6.51ct Round
$146,634 NZD