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 | 5.12ct OVAL E VVS2 | lab grown | 100 | $17,895 NZD |
| 2 | 5.11ct HEART D IF | lab grown | 100 | $23,668 NZD |
| 3 | 5.06ct OVAL E IF | lab grown | 100 | $23,436 NZD |
| 4 | 5.04ct HEART E IF | lab grown | 100 | $19,676 NZD |
| 5 | 4.71ct HEART D IF | lab grown | 100 | $15,875 NZD |
| 6 | 4.56ct OVAL D VVS1 | lab grown | 100 | $20,340 NZD |
| 7 | 4.24ct ROUND D VVS1 | lab grown | 100 | $8,113 NZD |
| 8 | 4.22ct ROUND D VVS1 | lab grown | 100 | $7,311 NZD |
| 9 | 4.21ct OVAL D VVS1 | lab grown | 100 | $11,627 NZD |
| 10 | 4.16ct HEART D IF | lab grown | 100 | $14,550 NZD |
| 11 | 3.96ct OVAL D FL | lab grown | 100 | $23,543 NZD |
| 12 | 3.91ct OVAL E VS1 | lab grown | 100 | $2,289 NZD |
| 13 | 3.79ct ASSCHER D FL | lab grown | 100 | $22,481 NZD |
| 14 | 3.67ct PRINCESS D VVS1 | lab grown | 100 | $7,211 NZD |
| 15 | 3.62ct ASSCHER G VVS2 | lab grown | 100 | $3,853 NZD |
| 16 | 3.60ct OVAL E VVS1 | lab grown | 100 | $13,652 NZD |
| 17 | 3.57ct HEART D IF | lab grown | 100 | $9,383 NZD |
| 18 | 3.52ct OVAL E VS2 | lab grown | 100 | $11,521 NZD |
| 19 | 3.51ct MARQUISE E VS2 | lab grown | 100 | $3,067 NZD |
| 20 | 3.42ct ROUND E VVS1 | lab grown | 100 | $4,496 NZD |
| 21 | 3.28ct ROUND F VS1 | lab grown | 100 | $1,232 NZD |
| 22 | 3.28ct PRINCESS E VVS2 | lab grown | 100 | $12,907 NZD |
| 23 | 3.26ct OVAL E IF | lab grown | 100 | $7,833 NZD |
| 24 | 3.17ct ROUND D VVS1 | lab grown | 100 | $1,717 NZD |
| 25 | 3.09ct CUSHION D VVS2 | lab grown | 100 | $4,958 NZD |
| 26 | 3.08ct OVAL G VS1 | lab grown | 100 | $3,799 NZD |
| 27 | 3.07ct OVAL E VS2 | lab grown | 100 | $2,150 NZD |
| 28 | 3.07ct OVAL G VS1 | lab grown | 100 | $3,638 NZD |
| 29 | 3.05ct OVAL E VS2 | lab grown | 100 | $2,143 NZD |
| 30 | 3.04ct ROUND D VVS1 | lab grown | 100 | $4,399 NZD |
| 31 | 3.03ct OVAL D VVS1 | lab grown | 100 | $6,085 NZD |
| 32 | 3.02ct EMERALD D VS1 | lab grown | 100 | $1,509 NZD |
| 33 | 3.02ct OVAL E VS2 | lab grown | 100 | $3,590 NZD |
| 34 | 3.02ct OVAL D VVS1 | lab grown | 100 | $6,064 NZD |
| 35 | 3.02ct HEART D IF | lab grown | 100 | $8,023 NZD |
| 36 | 3.01ct ROUND F VS1 | lab grown | 100 | $1,131 NZD |
| 37 | 3.01ct OVAL D VS1 | lab grown | 100 | $9,096 NZD |
| 38 | 3.01ct ROUND D IF | lab grown | 100 | $15,120 NZD |
| 39 | 2.94ct OVAL E VS1 | lab grown | 100 | $3,534 NZD |
| 40 | 2.92ct OVAL E VS1 | lab grown | 100 | $3,512 NZD |
| 41 | 2.90ct HEART D VVS1 | lab grown | 100 | $3,701 NZD |
| 42 | 2.84ct RADIANT E VS1 | lab grown | 100 | $1,646 NZD |
| 43 | 2.80ct HEART D IF | lab grown | 100 | $6,415 NZD |
| 44 | 2.71ct OVAL F VS2 | lab grown | 100 | $5,475 NZD |
| 45 | 2.70ct OVAL E VS2 | lab grown | 100 | $3,439 NZD |
| 46 | 2.67ct ROUND D VVS1 | lab grown | 100 | $3,732 NZD |
| 47 | 2.64ct OVAL D VVS1 | lab grown | 100 | $8,732 NZD |
| 48 | 2.61ct OVAL D VS2 | lab grown | 100 | $2,361 NZD |
| 49 | 2.58ct OVAL F VS1 | lab grown | 100 | $1,247 NZD |
| 50 | 2.58ct RADIANT F VS1 | lab grown | 100 | $3,094 NZD |
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