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 31 July 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 | 6.06ct OVAL D VVS2 | lab grown | 100 | $22,792 AUD |
| 6 | 5.30ct HEART D FL | natural | 100 | $335,031 AUD |
| 7 | 5.12ct OVAL E VVS2 | lab grown | 100 | $15,951 AUD |
| 8 | 5.11ct HEART D IF | lab grown | 100 | $21,017 AUD |
| 9 | 5.06ct OVAL E IF | lab grown | 100 | $20,811 AUD |
| 10 | 5.04ct HEART E IF | lab grown | 100 | $17,472 AUD |
| 11 | 5.01ct ROUND H SI2 | natural | 100 | $77,782 AUD |
| 12 | 4.71ct HEART D IF | lab grown | 100 | $14,097 AUD |
| 13 | 4.58ct ASSCHER E VVS2 | lab grown | 100 | $12,962 AUD |
| 14 | 4.56ct OVAL D VVS1 | lab grown | 100 | $18,062 AUD |
| 15 | 4.24ct ROUND D VVS1 | lab grown | 100 | $7,234 AUD |
| 16 | 4.22ct ROUND D VVS1 | lab grown | 100 | $7,200 AUD |
| 17 | 4.21ct OVAL D VVS1 | lab grown | 100 | $10,325 AUD |
| 18 | 4.16ct HEART D IF | lab grown | 100 | $12,920 AUD |
| 19 | 4.09ct OVAL F VVS2 | lab grown | 100 | $8,677 AUD |
| 20 | 4.07ct OVAL D VS1 | lab grown | 100 | $13,678 AUD |
| 21 | 4.03ct PRINCESS I VS2 | natural | 100 | $83,898 AUD |
| 22 | 4.01ct ROUND J SI1 | natural | 100 | $52,016 AUD |
| 23 | 4.01ct ROUND F IF | natural | 100 | $233,943 AUD |
| 24 | 3.96ct OVAL D FL | lab grown | 100 | $22,318 AUD |
| 25 | 3.91ct OVAL E VS1 | lab grown | 100 | $2,717 AUD |
| 26 | 3.79ct ASSCHER D FL | lab grown | 100 | $21,934 AUD |
| 27 | 3.67ct PRINCESS D VVS1 | lab grown | 100 | $6,403 AUD |
| 28 | 3.62ct ASSCHER G VVS2 | lab grown | 100 | $1,062 AUD |
| 29 | 3.60ct OVAL E VVS1 | lab grown | 100 | $12,123 AUD |
| 30 | 3.57ct HEART D IF | lab grown | 100 | $8,332 AUD |
| 31 | 3.55ct ASSCHER F VS1 | lab grown | 100 | $8,623 AUD |
| 32 | 3.52ct OVAL E VS2 | lab grown | 100 | $2,786 AUD |
| 33 | 3.52ct OVAL J SI1 | natural | 100 | $47,358 AUD |
| 34 | 3.51ct CUSHION E VS2 | lab grown | 100 | $2,723 AUD |
| 35 | 3.42ct ROUND E VVS1 | lab grown | 100 | $4,494 AUD |
| 36 | 3.37ct PRINCESS E VS2 | lab grown | 100 | $7,800 AUD |
| 37 | 3.37ct OVAL E VVS2 | lab grown | 100 | $9,846 AUD |
| 38 | 3.33ct RADIANT L VS1 | natural | 100 | $42,700 AUD |
| 39 | 3.28ct ROUND F VS1 | lab grown | 100 | $2,018 AUD |
| 40 | 3.28ct PRINCESS E VVS2 | lab grown | 100 | $9,546 AUD |
| 41 | 3.26ct OVAL E IF | lab grown | 100 | $6,955 AUD |
| 42 | 3.17ct ROUND D VVS1 | lab grown | 100 | $3,234 AUD |
| 43 | 3.09ct CUSHION D VVS2 | lab grown | 100 | $5,631 AUD |
| 44 | 3.07ct OVAL E VS2 | lab grown | 100 | $1,908 AUD |
| 45 | 3.06ct ROUND E VS1 | lab grown | 100 | $22,271 AUD |
| 46 | 3.06ct ROUND D VS2 | lab grown | 100 | $29,835 AUD |
| 47 | 3.05ct OVAL E VS2 | lab grown | 100 | $1,314 AUD |
| 48 | 3.05ct OVAL K SI1 | natural | 100 | $33,186 AUD |
| 49 | 3.04ct ROUND D VVS1 | lab grown | 100 | $4,171 AUD |
| 50 | 3.04ct HEART I SI2 | natural | 100 | $18,923 AUD |
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