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 15 September 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 | $173,510 AUD |
| 2 | 8.03ct OVAL G VS2 | natural | 100 | $549,850 AUD |
| 3 | 7.03ct CUSHION F VS2 | natural | 100 | $418,196 AUD |
| 4 | 7.01ct PEAR I SI2 | natural | 100 | $125,561 AUD |
| 5 | 5.30ct CUSHION D FL | natural | 100 | $267,934 AUD |
| 6 | 5.02ct OVAL H SI1 | natural | 100 | $153,219 AUD |
| 7 | 5.01ct ROUND H SI2 | natural | 100 | $64,595 AUD |
| 8 | 5.01ct CUSHION G SI1 | natural | 100 | $91,391 AUD |
| 9 | 4.50ct ROUND H VVS1 | natural | 100 | $53,188 AUD |
| 10 | 4.07ct OVAL H VVS2 | natural | 100 | $99,129 AUD |
| 11 | 4.03ct PRINCESS I VS2 | natural | 100 | $70,354 AUD |
| 12 | 4.03ct HEART E VS2 | natural | 100 | $112,538 AUD |
| 13 | 4.02ct HEART H SI1 | natural | 100 | $55,903 AUD |
| 14 | 4.01ct ROUND J SI1 | natural | 100 | $41,953 AUD |
| 15 | 4.01ct ROUND H SI2 | natural | 100 | $47,085 AUD |
| 16 | 3.52ct OVAL J SI1 | natural | 100 | $42,277 AUD |
| 17 | 3.33ct ASSCHER L VS1 | natural | 100 | $31,724 AUD |
| 18 | 3.10ct HEART I SI2 | natural | 100 | $17,729 AUD |
| 19 | 3.05ct OVAL K SI1 | natural | 100 | $24,659 AUD |
| 20 | 3.04ct HEART I SI2 | natural | 100 | $15,821 AUD |
| 21 | 3.04ct OVAL J SI2 | natural | 100 | $22,609 AUD |
| 22 | 3.02ct RADIANT H SI2 | natural | 100 | $41,575 AUD |
| 23 | 3.02ct ROUND F VS1 | natural | 100 | $100,917 AUD |
| 24 | 3.01ct CUSHION J VS2 | natural | 100 | $14,643 AUD |
| 25 | 3.01ct OVAL I SI2 | natural | 100 | $19,791 AUD |
| 26 | 3.01ct ROUND H SI2 | natural | 100 | $21,426 AUD |
| 27 | 3.01ct ROUND F SI2 | natural | 100 | $25,229 AUD |
| 28 | 3.01ct OVAL J SI2 | natural | 100 | $29,413 AUD |
| 29 | 3.01ct OVAL K SI1 | natural | 100 | $30,902 AUD |
| 30 | 3.01ct OVAL F SI1 | natural | 100 | $55,239 AUD |
| 31 | 3.01ct OVAL G VVS2 | natural | 100 | $58,031 AUD |
| 32 | 3.01ct ROUND G VS2 | natural | 100 | $72,942 AUD |
| 33 | 2.68ct CUSHION D VS1 | natural | 100 | $27,782 AUD |
| 34 | 2.53ct ROUND I SI2 | natural | 100 | $22,774 AUD |
| 35 | 2.52ct OVAL D VS1 | natural | 100 | $64,782 AUD |
| 36 | 2.51ct OVAL D VVS1 | natural | 100 | $49,883 AUD |
| 37 | 2.50ct ROUND H VVS2 | natural | 100 | $26,976 AUD |
| 38 | 2.42ct ROUND I VVS1 | natural | 100 | $19,468 AUD |
| 39 | 2.34ct ROUND G SI2 | natural | 100 | $11,263 AUD |
| 40 | 2.20ct HEART I VS2 | natural | 100 | $22,435 AUD |
| 41 | 2.20ct ROUND H VS1 | natural | 100 | $31,591 AUD |
| 42 | 2.12ct ROUND E VVS1 | natural | 100 | $39,812 AUD |
| 43 | 2.08ct ASSCHER F VS2 | natural | 100 | $22,806 AUD |
| 44 | 2.05ct ROUND H VS1 | natural | 100 | $14,842 AUD |
| 45 | 2.04ct ROUND I SI1 | natural | 100 | $18,404 AUD |
| 46 | 2.03ct ROUND H VS1 | natural | 100 | $19,556 AUD |
| 47 | 2.03ct EMERALD D VVS1 | natural | 100 | $49,637 AUD |
| 48 | 2.02ct OVAL I SI1 | natural | 100 | $15,191 AUD |
| 49 | 2.02ct ASSCHER J VVS1 | natural | 100 | $17,986 AUD |
| 50 | 2.02ct CUSHION F SI1 | natural | 100 | $23,739 AUD |
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