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 November 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 | Grade | Lowest Price (AUD) |
|---|---|---|---|---|
| 1 | 17.84ct CUSHION E VS2 | lab grown | A+ | $51,409 AUD |
| 2 | 16.72ct OVAL F VS2 | lab grown | A+ | $39,775 AUD |
| 3 | 16.48ct OVAL F SI1 | lab grown | A+ | $5,472 AUD |
| 4 | 16.45ct OVAL F SI1 | lab grown | A+ | $8,473 AUD |
| 5 | 16.21ct RADIANT F VS2 | lab grown | A+ | $37,957 AUD |
| 6 | 16.09ct EMERALD F VS2 | lab grown | A+ | $16,816 AUD |
| 7 | 16.08ct OVAL G VS2 | lab grown | A+ | $8,292 AUD |
| 8 | 15.76ct OVAL E VS2 | lab grown | A+ | $37,492 AUD |
| 9 | 15.71ct ROUND F VS2 | lab grown | A+ | $28,929 AUD |
| 10 | 15.67ct OVAL F VS2 | lab grown | A+ | $37,278 AUD |
| 11 | 15.61ct RADIANT G VVS2 | lab grown | A+ | $37,829 AUD |
| 12 | 15.45ct RADIANT G VS2 | lab grown | A+ | $30,794 AUD |
| 13 | 15.27ct EMERALD H VS2 | lab grown | A+ | $7,756 AUD |
| 14 | 15.20ct ROUND E SI1 | lab grown | A+ | $14,171 AUD |
| 15 | 15.20ct ROUND E SI1 | lab grown | A+ | $20,165 AUD |
| 16 | 15.16ct EMERALD F VS2 | lab grown | A+ | $14,134 AUD |
| 17 | 15.01ct ROUND E VS2 | lab grown | A+ | $27,642 AUD |
| 18 | 15.00ct OVAL E VS1 | lab grown | A+ | $33,188 AUD |
| 19 | 14.85ct EMERALD F VS1 | lab grown | A+ | $18,954 AUD |
| 20 | 14.60ct CUSHION F VS1 | lab grown | A+ | $22,312 AUD |
| 21 | 14.29ct PEAR F VS2 | lab grown | A+ | $13,439 AUD |
| 22 | 14.23ct ROUND F VS2 | lab grown | A+ | $13,570 AUD |
| 23 | 14.04ct RADIANT F VS1 | lab grown | A+ | $20,299 AUD |
| 24 | 13.85ct ROUND F VS1 | lab grown | A+ | $14,018 AUD |
| 25 | 13.73ct ROUND F VS2 | lab grown | A+ | $13,076 AUD |
| 26 | 13.65ct ROUND F VS2 | lab grown | A+ | $13,027 AUD |
| 27 | 13.52ct ROUND E VS1 | lab grown | A+ | $28,506 AUD |
| 28 | 13.34ct EMERALD I VS2 | lab grown | A+ | $6,916 AUD |
| 29 | 13.22ct RADIANT E VS1 | lab grown | A+ | $37,797 AUD |
| 30 | 13.19ct OVAL E VVS2 | lab grown | A+ | $21,257 AUD |
| 31 | 13.11ct RADIANT E VS1 | lab grown | A+ | $25,666 AUD |
| 32 | 13.07ct ROUND E VS2 | lab grown | A+ | $12,580 AUD |
| 33 | 13.06ct ROUND F VS2 | lab grown | A+ | $12,476 AUD |
| 34 | 13.06ct ROUND G VS2 | lab grown | A+ | $14,404 AUD |
| 35 | 12.84ct OVAL E VS2 | lab grown | A+ | $13,538 AUD |
| 36 | 12.75ct ROUND F VS2 | lab grown | A+ | $12,186 AUD |
| 37 | 12.69ct RADIANT E VS2 | lab grown | A+ | $31,519 AUD |
| 38 | 12.64ct ROUND E VS2 | lab grown | A+ | $12,176 AUD |
| 39 | 12.63ct ROUND F VS2 | lab grown | A+ | $12,074 AUD |
| 40 | 12.62ct ROUND E VVS2 | lab grown | A+ | $15,960 AUD |
| 41 | 12.59ct OVAL E VS2 | lab grown | A+ | $21,479 AUD |
| 42 | 12.55ct ROUND F VS2 | lab grown | A+ | $12,000 AUD |
| 43 | 12.55ct OVAL E VS2 | lab grown | A+ | $21,411 AUD |
| 44 | 12.53ct ROUND E VS2 | lab grown | A+ | $23,174 AUD |
| 45 | 12.43ct ROUND F VS2 | lab grown | A+ | $10,001 AUD |
| 46 | 12.38ct ROUND E VS1 | lab grown | A+ | $26,140 AUD |
| 47 | 12.36ct RADIANT E VS2 | lab grown | A+ | $12,025 AUD |
| 48 | 12.34ct ROUND E VS2 | lab grown | A+ | $11,894 AUD |
| 49 | 12.34ct RADIANT F VS1 | lab grown | A+ | $13,813 AUD |
| 50 | 12.31ct ROUND F VS1 | lab grown | A+ | $23,633 AUD |
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