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Radiant|Natural|GIA

1.51ct F SI1 Radiant Natural Diamond

EX • F/SI1 • GIA 6545057025

Certificate GIA 6545057025

Diamond specifications and retailer prices

From $11,515 AUD
As of November 1, 2026
Save $9,003 AUD (44%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $20,517 AUD at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1.51ct natural radiant diamond

This 1.51ct natural radiant sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6545057025. Listed at 20 retailers as of October 30, 2026, with prices from $11,515 to $20,517, a $9,003 spread on the same certified stone. NZ Jewellers lists it at $20,517. 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

1.51
Carat
F
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.53°
Pavilion angle29.05°
OriginNatural
Grading LabGIA
CertificateGIA 6545057025
Dimensions5.53 × 8.15 × 3.60 mm
L/W Ratio1.47
Top View
5.53 mm8.15 mm1.51 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6545057025
Side View
Table 66.0%Crown 43.53°Girdle: Very ThickPavilion 29.05°Culet: NoneDepth 65.2%

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 1
Current: $20,517 AUD|Low: $11,284 AUD|High: $21,161 AUD|Avg: $14,419 AUD|-3.0%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
November 2, 2026
Retailer 9$11,525 AUD
Retailer 19$12,229 AUD
Retailer 5$12,310 AUD
Retailer 15$12,310 AUD
Retailer 8$12,413 AUD
Retailer 6$13,336 AUD
Retailer 2$13,457 AUD
Retailer 13$13,520 AUD
Retailer 18$13,541 AUD
Retailer 3$13,680 AUD
Retailer 4$14,540 AUD
Retailer 17$14,540 AUD
Retailer 11$14,704 AUD
Retailer 14$14,940 AUD
Retailer 16$15,025 AUD
Retailer 7$15,388 AUD
Retailer 10$16,202 AUD
Retailer 12$19,225 AUD
NZ Jewellers$20,517 AUD

42 data points across 19 retailers

20 retailers$11,515 AUD to $20,517 AUD

B+
Cheapest Retailer
-
$11,515 AUD
B+
Retailer 2
-
$11,525 AUD
$8,077 USD
View
B+
Retailer 3
-
$12,229 AUD
$8,570 USD
View
B+
Retailer 4
-
$12,310 AUD
$8,627 USD
View
B+
Retailer 5
-
$12,310 AUD
$8,627 USD
View
Final sale: no returns
B+
Retailer 6
-
$12,413 AUD
$8,699 USD
View
B+
Retailer 7
-
$13,336 AUD
$9,346 USD
View
B+
Retailer 8
-
$13,457 AUD
£7,426 GBP
View
Retailer 9
-
$13,520 AUD
View
Price last confirmed 9 days ago
B+
Retailer 10
-
$13,541 AUD
$9,490 USD
View
B+
Retailer 11
-
$13,680 AUD
$9,587 USD
View
B
Retailer 12
-
$14,540 AUD
$10,190 USD
View
B
Retailer 13
-
$14,540 AUD
$10,190 USD
View
B
Retailer 14
-
$14,704 AUD
$10,305 USD
View
B
Retailer 15
-
$14,940 AUD
$10,470 USD
View
B
Retailer 16
-
$15,025 AUD
$10,530 USD
View
B
Retailer 17
-
$15,388 AUD
$10,784 USD
View
Retailer 18
-
$16,202 AUD
$11,355 USD
View
Price last confirmed 10 days ago
B
Retailer 19
-
$19,225 AUD
£10,609 GBP
View
Most Expensive
B
NZ Jewellers
1e0b6c26-ff93-4381-948b-98c0c0e75016 · Oct 30
$20,517 AUD
$14,379 USD
View
19 more retailers have this diamond
Prices start from $11,515 AUDSave up to $9,003 AUD

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+
1.51ct Radiant
$11,515 AUD