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 | 5.12ct OVAL E VVS2 | lab grown | 100 | $14,487 AUD |
| 2 | 5.11ct HEART D IF | lab grown | 100 | $19,161 AUD |
| 3 | 5.06ct OVAL E IF | lab grown | 100 | $18,973 AUD |
| 4 | 5.04ct HEART E IF | lab grown | 100 | $15,929 AUD |
| 5 | 4.71ct HEART D IF | lab grown | 100 | $12,852 AUD |
| 6 | 4.56ct OVAL D VVS1 | lab grown | 100 | $16,467 AUD |
| 7 | 4.24ct ROUND D VVS1 | lab grown | 100 | $6,568 AUD |
| 8 | 4.22ct ROUND D VVS1 | lab grown | 100 | $5,919 AUD |
| 9 | 4.21ct OVAL D VVS1 | lab grown | 100 | $9,413 AUD |
| 10 | 4.16ct HEART D IF | lab grown | 100 | $11,779 AUD |
| 11 | 3.96ct OVAL D FL | lab grown | 100 | $19,060 AUD |
| 12 | 3.91ct OVAL E VS1 | lab grown | 100 | $1,853 AUD |
| 13 | 3.79ct ASSCHER D FL | lab grown | 100 | $18,200 AUD |
| 14 | 3.67ct PRINCESS D VVS1 | lab grown | 100 | $5,838 AUD |
| 15 | 3.62ct ASSCHER G VVS2 | lab grown | 100 | $3,119 AUD |
| 16 | 3.60ct OVAL E VVS1 | lab grown | 100 | $11,052 AUD |
| 17 | 3.57ct HEART D IF | lab grown | 100 | $7,596 AUD |
| 18 | 3.52ct OVAL E VS2 | lab grown | 100 | $9,327 AUD |
| 19 | 3.51ct MARQUISE E VS2 | lab grown | 100 | $2,483 AUD |
| 20 | 3.42ct ROUND E VVS1 | lab grown | 100 | $3,640 AUD |
| 21 | 3.28ct ROUND F VS1 | lab grown | 100 | $997 AUD |
| 22 | 3.28ct PRINCESS E VVS2 | lab grown | 100 | $10,449 AUD |
| 23 | 3.26ct OVAL E IF | lab grown | 100 | $6,341 AUD |
| 24 | 3.17ct ROUND D VVS1 | lab grown | 100 | $1,390 AUD |
| 25 | 3.09ct CUSHION D VVS2 | lab grown | 100 | $4,014 AUD |
| 26 | 3.08ct OVAL G VS1 | lab grown | 100 | $3,076 AUD |
| 27 | 3.07ct OVAL E VS2 | lab grown | 100 | $1,741 AUD |
| 28 | 3.07ct OVAL G VS1 | lab grown | 100 | $2,945 AUD |
| 29 | 3.05ct OVAL E VS2 | lab grown | 100 | $1,735 AUD |
| 30 | 3.04ct ROUND D VVS1 | lab grown | 100 | $3,561 AUD |
| 31 | 3.03ct OVAL D VVS1 | lab grown | 100 | $4,926 AUD |
| 32 | 3.02ct EMERALD D VS1 | lab grown | 100 | $1,222 AUD |
| 33 | 3.02ct OVAL E VS2 | lab grown | 100 | $2,906 AUD |
| 34 | 3.02ct OVAL D VVS1 | lab grown | 100 | $4,909 AUD |
| 35 | 3.02ct HEART D IF | lab grown | 100 | $6,495 AUD |
| 36 | 3.01ct ROUND F VS1 | lab grown | 100 | $916 AUD |
| 37 | 3.01ct OVAL D VS1 | lab grown | 100 | $7,364 AUD |
| 38 | 3.01ct ROUND D IF | lab grown | 100 | $12,240 AUD |
| 39 | 2.94ct OVAL E VS1 | lab grown | 100 | $2,861 AUD |
| 40 | 2.92ct OVAL E VS1 | lab grown | 100 | $2,843 AUD |
| 41 | 2.90ct HEART D VVS1 | lab grown | 100 | $2,996 AUD |
| 42 | 2.84ct RADIANT E VS1 | lab grown | 100 | $1,332 AUD |
| 43 | 2.80ct HEART D IF | lab grown | 100 | $5,194 AUD |
| 44 | 2.71ct OVAL F VS2 | lab grown | 100 | $4,432 AUD |
| 45 | 2.70ct OVAL E VS2 | lab grown | 100 | $2,784 AUD |
| 46 | 2.67ct ROUND D VVS1 | lab grown | 100 | $3,021 AUD |
| 47 | 2.64ct OVAL D VVS1 | lab grown | 100 | $7,069 AUD |
| 48 | 2.61ct OVAL D VS2 | lab grown | 100 | $1,912 AUD |
| 49 | 2.58ct OVAL F VS1 | lab grown | 100 | $1,010 AUD |
| 50 | 2.58ct RADIANT F VS1 | lab grown | 100 | $2,505 AUD |
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