Top 50 Diamonds by Certification Score in New Zealand
Ranked by certificate rigour. GIA and AGS stones with complete grading, clear symmetry, and verified provenance come out on top. Pricing shown in NZD.
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 (NZD) |
|---|---|---|---|---|
| 1 | 8.04ct ROUND K SI1 | natural | 100 | $206,177 NZD |
| 2 | 8.03ct OVAL G VS2 | natural | 100 | $653,370 NZD |
| 3 | 7.03ct CUSHION F VS2 | natural | 100 | $496,930 NZD |
| 4 | 7.01ct PEAR I SI2 | natural | 100 | $149,200 NZD |
| 5 | 5.30ct CUSHION D FL | natural | 100 | $318,378 NZD |
| 6 | 5.02ct OVAL H SI1 | natural | 100 | $182,066 NZD |
| 7 | 5.01ct ROUND H SI2 | natural | 100 | $76,757 NZD |
| 8 | 5.01ct CUSHION G SI1 | natural | 100 | $108,597 NZD |
| 9 | 4.50ct ROUND H VVS1 | natural | 100 | $63,202 NZD |
| 10 | 4.07ct OVAL H VVS2 | natural | 100 | $117,793 NZD |
| 11 | 4.03ct PRINCESS I VS2 | natural | 100 | $83,599 NZD |
| 12 | 4.03ct HEART E VS2 | natural | 100 | $133,725 NZD |
| 13 | 4.02ct HEART H SI1 | natural | 100 | $66,427 NZD |
| 14 | 4.01ct ROUND J SI1 | natural | 100 | $49,851 NZD |
| 15 | 4.01ct ROUND H SI2 | natural | 100 | $55,950 NZD |
| 16 | 3.52ct OVAL J SI1 | natural | 100 | $50,236 NZD |
| 17 | 3.33ct ASSCHER L VS1 | natural | 100 | $37,697 NZD |
| 18 | 3.10ct HEART I SI2 | natural | 100 | $21,067 NZD |
| 19 | 3.05ct OVAL K SI1 | natural | 100 | $29,301 NZD |
| 20 | 3.04ct HEART I SI2 | natural | 100 | $18,800 NZD |
| 21 | 3.04ct OVAL J SI2 | natural | 100 | $26,865 NZD |
| 22 | 3.02ct RADIANT H SI2 | natural | 100 | $49,402 NZD |
| 23 | 3.02ct ROUND F VS1 | natural | 100 | $119,917 NZD |
| 24 | 3.01ct CUSHION J VS2 | natural | 100 | $17,400 NZD |
| 25 | 3.01ct OVAL I SI2 | natural | 100 | $23,517 NZD |
| 26 | 3.01ct ROUND H SI2 | natural | 100 | $25,460 NZD |
| 27 | 3.01ct ROUND F SI2 | natural | 100 | $29,979 NZD |
| 28 | 3.01ct OVAL J SI2 | natural | 100 | $34,950 NZD |
| 29 | 3.01ct OVAL K SI1 | natural | 100 | $36,720 NZD |
| 30 | 3.01ct OVAL F SI1 | natural | 100 | $65,638 NZD |
| 31 | 3.01ct OVAL G VVS2 | natural | 100 | $68,957 NZD |
| 32 | 3.01ct ROUND G VS2 | natural | 100 | $86,675 NZD |
| 33 | 2.68ct CUSHION D VS1 | natural | 100 | $33,012 NZD |
| 34 | 2.53ct ROUND I SI2 | natural | 100 | $27,062 NZD |
| 35 | 2.52ct OVAL D VS1 | natural | 100 | $76,979 NZD |
| 36 | 2.51ct OVAL D VVS1 | natural | 100 | $59,274 NZD |
| 37 | 2.50ct ROUND H VVS2 | natural | 100 | $32,055 NZD |
| 38 | 2.42ct ROUND I VVS1 | natural | 100 | $23,133 NZD |
| 39 | 2.34ct ROUND G SI2 | natural | 100 | $13,383 NZD |
| 40 | 2.20ct HEART I VS2 | natural | 100 | $26,659 NZD |
| 41 | 2.20ct ROUND H VS1 | natural | 100 | $37,538 NZD |
| 42 | 2.12ct ROUND E VVS1 | natural | 100 | $47,308 NZD |
| 43 | 2.08ct ASSCHER F VS2 | natural | 100 | $27,100 NZD |
| 44 | 2.05ct ROUND H VS1 | natural | 100 | $17,636 NZD |
| 45 | 2.04ct ROUND I SI1 | natural | 100 | $21,868 NZD |
| 46 | 2.03ct ROUND H VS1 | natural | 100 | $23,238 NZD |
| 47 | 2.03ct EMERALD D VVS1 | natural | 100 | $58,982 NZD |
| 48 | 2.02ct OVAL I SI1 | natural | 100 | $18,051 NZD |
| 49 | 2.02ct ASSCHER J VVS1 | natural | 100 | $21,372 NZD |
| 50 | 2.02ct CUSHION F SI1 | natural | 100 | $28,208 NZD |
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