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 | 5.12ct OVAL E VVS2 | lab grown | 100 | $14,487 AUD |
| 7 | 5.11ct HEART D IF | lab grown | 100 | $19,161 AUD |
| 8 | 5.06ct OVAL E IF | lab grown | 100 | $18,973 AUD |
| 9 | 5.04ct HEART E IF | lab grown | 100 | $15,929 AUD |
| 10 | 5.02ct OVAL H SI1 | natural | 100 | $153,219 AUD |
| 11 | 5.01ct ROUND H SI2 | natural | 100 | $64,595 AUD |
| 12 | 5.01ct CUSHION G SI1 | natural | 100 | $91,391 AUD |
| 13 | 4.71ct HEART D IF | lab grown | 100 | $12,852 AUD |
| 14 | 4.56ct OVAL D VVS1 | lab grown | 100 | $16,467 AUD |
| 15 | 4.50ct ROUND H VVS1 | natural | 100 | $53,188 AUD |
| 16 | 4.24ct ROUND D VVS1 | lab grown | 100 | $6,568 AUD |
| 17 | 4.22ct ROUND D VVS1 | lab grown | 100 | $5,919 AUD |
| 18 | 4.21ct OVAL D VVS1 | lab grown | 100 | $9,413 AUD |
| 19 | 4.16ct HEART D IF | lab grown | 100 | $11,779 AUD |
| 20 | 4.07ct OVAL H VVS2 | natural | 100 | $99,129 AUD |
| 21 | 4.03ct PRINCESS I VS2 | natural | 100 | $70,354 AUD |
| 22 | 4.03ct HEART E VS2 | natural | 100 | $112,538 AUD |
| 23 | 4.02ct HEART H SI1 | natural | 100 | $55,795 AUD |
| 24 | 4.01ct ROUND J SI1 | natural | 100 | $41,953 AUD |
| 25 | 4.01ct ROUND H SI2 | natural | 100 | $47,085 AUD |
| 26 | 3.96ct OVAL D FL | lab grown | 100 | $19,060 AUD |
| 27 | 3.91ct OVAL E VS1 | lab grown | 100 | $1,853 AUD |
| 28 | 3.79ct ASSCHER D FL | lab grown | 100 | $18,200 AUD |
| 29 | 3.67ct PRINCESS D VVS1 | lab grown | 100 | $5,838 AUD |
| 30 | 3.62ct ASSCHER G VVS2 | lab grown | 100 | $3,119 AUD |
| 31 | 3.60ct OVAL E VVS1 | lab grown | 100 | $11,052 AUD |
| 32 | 3.57ct HEART D IF | lab grown | 100 | $7,596 AUD |
| 33 | 3.52ct OVAL E VS2 | lab grown | 100 | $9,327 AUD |
| 34 | 3.52ct OVAL J SI1 | natural | 100 | $42,277 AUD |
| 35 | 3.51ct MARQUISE E VS2 | lab grown | 100 | $2,483 AUD |
| 36 | 3.42ct ROUND E VVS1 | lab grown | 100 | $3,640 AUD |
| 37 | 3.33ct ASSCHER L VS1 | natural | 100 | $31,724 AUD |
| 38 | 3.28ct ROUND F VS1 | lab grown | 100 | $997 AUD |
| 39 | 3.28ct PRINCESS E VVS2 | lab grown | 100 | $10,449 AUD |
| 40 | 3.26ct OVAL E IF | lab grown | 100 | $6,341 AUD |
| 41 | 3.17ct ROUND D VVS1 | lab grown | 100 | $1,390 AUD |
| 42 | 3.10ct HEART I SI2 | natural | 100 | $17,729 AUD |
| 43 | 3.09ct CUSHION D VVS2 | lab grown | 100 | $4,014 AUD |
| 44 | 3.08ct OVAL G VS1 | lab grown | 100 | $3,076 AUD |
| 45 | 3.07ct OVAL E VS2 | lab grown | 100 | $1,741 AUD |
| 46 | 3.07ct OVAL G VS1 | lab grown | 100 | $2,945 AUD |
| 47 | 3.05ct OVAL E VS2 | lab grown | 100 | $1,735 AUD |
| 48 | 3.05ct OVAL K SI1 | natural | 100 | $24,659 AUD |
| 49 | 3.04ct ROUND D VVS1 | lab grown | 100 | $3,561 AUD |
| 50 | 3.04ct HEART I SI2 | natural | 100 | $15,821 AUD |
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