Top 50 Diamonds by Certification Score in Australia
Ranked by certificate rigour. GIA and AGS stones with complete grading, clear symmetry, and verified provenance come out on top. Pricing shown in AUD.
Last updated 1 August 2026 · Based on 50 active listings ranked by certification
What Certification Score Rewards
Certification score measures the rigour and completeness of the grading report behind each diamond. It weights the grading lab (GIA and AGS lead; IGI and HRD follow; newer or less-consistent labs are lower), the presence of a polish and symmetry grade (required for Excellent-cut claims), and the completeness of the proportions data. It's not measuring the diamond itself. It's measuring how confident you can be that the grades on paper match what you'll receive.
Use this list when you're buying at a price point where certification rigour matters most. Say, above $10,000, or when the stone will be insured, resold, or given as a gift with a certificate presentation. The top of this list is where the paper trail is strongest: full GIA reports with polish and symmetry grades, complete measurement data, and a clean provenance.
A high certification score doesn't mean the stone is beautiful. It just means the grading is trustworthy. Cross-reference with quality score for stones that are both well-documented and well-made. For lab-grown, IGI tops this list more often than GIA because IGI has become the default lab-grown certifier and has the most complete reports for that segment.
| # | Diamond | Origin | Score | Lowest Price (AUD) |
|---|---|---|---|---|
| 1 | 8.04ct ROUND K SI1 | natural | 100 | $121,592 AUD |
| 2 | 8.03ct OVAL G VS2 | natural | 100 | $545,325 AUD |
| 3 | 7.03ct CUSHION F VS2 | natural | 100 | $503,616 AUD |
| 4 | 7.01ct PEAR I SI2 | natural | 100 | $144,846 AUD |
| 5 | 5.30ct HEART D FL | natural | 100 | $335,031 AUD |
| 6 | 5.01ct ROUND H SI2 | natural | 100 | $77,782 AUD |
| 7 | 4.03ct PRINCESS I VS2 | natural | 100 | $83,898 AUD |
| 8 | 4.01ct ROUND J SI1 | natural | 100 | $52,016 AUD |
| 9 | 4.01ct ROUND F IF | natural | 100 | $237,123 AUD |
| 10 | 3.52ct OVAL J SI1 | natural | 100 | $47,358 AUD |
| 11 | 3.33ct RADIANT L VS1 | natural | 100 | $42,700 AUD |
| 12 | 3.05ct OVAL K SI1 | natural | 100 | $33,186 AUD |
| 13 | 3.04ct HEART I SI2 | natural | 100 | $18,923 AUD |
| 14 | 3.04ct OVAL J SI2 | natural | 100 | $24,525 AUD |
| 15 | 3.02ct ROUND F VS1 | natural | 100 | $84,420 AUD |
| 16 | 3.01ct PEAR H SI2 | natural | 100 | $13,112 AUD |
| 17 | 3.01ct CUSHION J VS2 | natural | 100 | $16,662 AUD |
| 18 | 3.01ct OVAL I SI2 | natural | 100 | $23,246 AUD |
| 19 | 3.01ct OVAL K SI1 | natural | 100 | $25,147 AUD |
| 20 | 3.01ct OVAL J SI2 | natural | 100 | $29,680 AUD |
| 21 | 3.01ct ROUND H SI2 | natural | 100 | $30,738 AUD |
| 22 | 3.01ct ROUND F SI2 | natural | 100 | $36,200 AUD |
| 23 | 3.01ct PEAR F SI2 | natural | 100 | $38,292 AUD |
| 24 | 3.01ct OVAL F SI1 | natural | 100 | $62,877 AUD |
| 25 | 3.01ct ROUND G VS2 | natural | 100 | $80,008 AUD |
| 26 | 2.68ct CUSHION D VS1 | natural | 100 | $37,006 AUD |
| 27 | 2.67ct OVAL L SI2 | natural | 100 | $22,554 AUD |
| 28 | 2.52ct OVAL D VS1 | natural | 100 | $45,292 AUD |
| 29 | 2.51ct OVAL D VVS1 | natural | 100 | $56,497 AUD |
| 30 | 2.42ct ROUND I VVS1 | natural | 100 | $22,246 AUD |
| 31 | 2.34ct ROUND G SI2 | natural | 100 | $12,877 AUD |
| 32 | 2.04ct ROUND I SI1 | natural | 100 | $21,165 AUD |
| 33 | 2.03ct EMERALD D VVS1 | natural | 100 | $54,445 AUD |
| 34 | 2.02ct ROUND J I1 | natural | 100 | $3,065 AUD |
| 35 | 2.02ct PEAR F VS1 | natural | 100 | $25,717 AUD |
| 36 | 2.02ct CUSHION F SI1 | natural | 100 | $26,038 AUD |
| 37 | 2.01ct RADIANT H SI2 | natural | 100 | $8,785 AUD |
| 38 | 2.01ct CUSHION H VS2 | natural | 100 | $9,338 AUD |
| 39 | 2.01ct CUSHION H VS2 | natural | 100 | $9,446 AUD |
| 40 | 2.01ct PEAR H SI2 | natural | 100 | $11,938 AUD |
| 41 | 2.01ct ROUND G SI2 | natural | 100 | $12,428 AUD |
| 42 | 2.01ct ROUND H SI1 | natural | 100 | $13,162 AUD |
| 43 | 2.01ct ASSCHER I SI1 | natural | 100 | $15,283 AUD |
| 44 | 2.01ct HEART I VS2 | natural | 100 | $15,754 AUD |
| 45 | 2.01ct ROUND J SI2 | natural | 100 | $15,831 AUD |
| 46 | 2.01ct OVAL I VVS2 | natural | 100 | $20,169 AUD |
| 47 | 2.01ct ROUND E SI2 | natural | 100 | $22,019 AUD |
| 48 | 2.01ct ROUND G SI2 | natural | 100 | $22,208 AUD |
| 49 | 2.01ct ROUND D SI2 | natural | 100 | $25,849 AUD |
| 50 | 2.01ct ROUND G SI2 | natural | 100 | $26,369 AUD |
Compare prices across 100+ retailers worldwide. Find the best deal on your perfect diamond.