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 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 (NZD) |
|---|---|---|---|---|
| 1 | 8.04ct ROUND K SI1 | natural | 100 | $131,724 NZD |
| 2 | 8.03ct OVAL G VS2 | natural | 100 | $590,769 NZD |
| 3 | 7.03ct CUSHION F VS2 | natural | 100 | $545,584 NZD |
| 4 | 7.01ct PEAR I SI2 | natural | 100 | $156,917 NZD |
| 5 | 6.06ct OVAL D VVS2 | lab grown | 100 | $24,692 NZD |
| 6 | 5.30ct HEART D FL | natural | 100 | $362,950 NZD |
| 7 | 5.12ct OVAL E VVS2 | lab grown | 100 | $17,280 NZD |
| 8 | 5.11ct HEART D IF | lab grown | 100 | $22,768 NZD |
| 9 | 5.06ct OVAL E IF | lab grown | 100 | $22,545 NZD |
| 10 | 5.04ct HEART E IF | lab grown | 100 | $18,928 NZD |
| 11 | 5.01ct ROUND H SI2 | natural | 100 | $84,263 NZD |
| 12 | 4.71ct HEART D IF | lab grown | 100 | $15,272 NZD |
| 13 | 4.58ct ASSCHER E VVS2 | lab grown | 100 | $14,042 NZD |
| 14 | 4.56ct OVAL D VVS1 | lab grown | 100 | $19,567 NZD |
| 15 | 4.24ct ROUND D VVS1 | lab grown | 100 | $7,837 NZD |
| 16 | 4.22ct ROUND D VVS1 | lab grown | 100 | $7,800 NZD |
| 17 | 4.21ct OVAL D VVS1 | lab grown | 100 | $11,185 NZD |
| 18 | 4.16ct HEART D IF | lab grown | 100 | $13,997 NZD |
| 19 | 4.09ct OVAL F VVS2 | lab grown | 100 | $9,400 NZD |
| 20 | 4.07ct OVAL D VS1 | lab grown | 100 | $14,818 NZD |
| 21 | 4.03ct PRINCESS I VS2 | natural | 100 | $90,890 NZD |
| 22 | 4.01ct ROUND J SI1 | natural | 100 | $56,351 NZD |
| 23 | 4.01ct ROUND F IF | natural | 100 | $253,438 NZD |
| 24 | 3.96ct OVAL D FL | lab grown | 100 | $24,178 NZD |
| 25 | 3.91ct OVAL E VS1 | lab grown | 100 | $2,943 NZD |
| 26 | 3.79ct ASSCHER D FL | lab grown | 100 | $23,762 NZD |
| 27 | 3.67ct PRINCESS D VVS1 | lab grown | 100 | $6,937 NZD |
| 28 | 3.62ct ASSCHER G VVS2 | lab grown | 100 | $1,150 NZD |
| 29 | 3.60ct OVAL E VVS1 | lab grown | 100 | $13,133 NZD |
| 30 | 3.57ct HEART D IF | lab grown | 100 | $9,027 NZD |
| 31 | 3.55ct ASSCHER F VS1 | lab grown | 100 | $9,342 NZD |
| 32 | 3.52ct OVAL E VS2 | lab grown | 100 | $3,018 NZD |
| 33 | 3.52ct OVAL J SI1 | natural | 100 | $51,305 NZD |
| 34 | 3.51ct CUSHION E VS2 | lab grown | 100 | $2,950 NZD |
| 35 | 3.42ct ROUND E VVS1 | lab grown | 100 | $4,868 NZD |
| 36 | 3.37ct PRINCESS E VS2 | lab grown | 100 | $8,450 NZD |
| 37 | 3.37ct OVAL E VVS2 | lab grown | 100 | $10,667 NZD |
| 38 | 3.33ct RADIANT L VS1 | natural | 100 | $46,258 NZD |
| 39 | 3.28ct ROUND F VS1 | lab grown | 100 | $2,187 NZD |
| 40 | 3.28ct PRINCESS E VVS2 | lab grown | 100 | $10,342 NZD |
| 41 | 3.26ct OVAL E IF | lab grown | 100 | $7,535 NZD |
| 42 | 3.17ct ROUND D VVS1 | lab grown | 100 | $3,503 NZD |
| 43 | 3.09ct CUSHION D VVS2 | lab grown | 100 | $6,100 NZD |
| 44 | 3.07ct OVAL E VS2 | lab grown | 100 | $2,067 NZD |
| 45 | 3.06ct ROUND E VS1 | lab grown | 100 | $24,127 NZD |
| 46 | 3.06ct ROUND D VS2 | lab grown | 100 | $32,322 NZD |
| 47 | 3.05ct OVAL E VS2 | lab grown | 100 | $1,423 NZD |
| 48 | 3.05ct OVAL K SI1 | natural | 100 | $35,952 NZD |
| 49 | 3.04ct ROUND D VVS1 | lab grown | 100 | $4,518 NZD |
| 50 | 3.04ct HEART I SI2 | natural | 100 | $20,500 NZD |
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