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.

#DiamondOriginScoreLowest Price (NZD)
18.04ct ROUND K SI1natural100$214,321 NZD
28.03ct OVAL G VS2natural100$679,178 NZD
37.03ct CUSHION F VS2natural100$516,559 NZD
47.01ct PEAR I SI2natural100$155,093 NZD
55.30ct CUSHION D FLnatural100$330,953 NZD
65.02ct OVAL H SI1natural100$189,258 NZD
75.01ct ROUND H SI2natural100$79,789 NZD
85.01ct CUSHION G SI1natural100$112,886 NZD
94.50ct ROUND H VVS1natural100$65,698 NZD
104.07ct OVAL H VVS2natural100$122,445 NZD
114.03ct PRINCESS I VS2natural100$86,901 NZD
124.03ct HEART E VS2natural100$139,007 NZD
134.02ct HEART H SI1natural100$69,051 NZD
144.01ct ROUND J SI1natural100$51,820 NZD
154.01ct ROUND H SI2natural100$58,160 NZD
163.52ct OVAL J SI1natural100$52,220 NZD
173.33ct ASSCHER L VS1natural100$39,186 NZD
183.10ct HEART I SI2natural100$21,899 NZD
193.05ct OVAL K SI1natural100$30,459 NZD
203.04ct HEART I SI2natural100$19,543 NZD
213.04ct OVAL J SI2natural100$27,926 NZD
223.02ct RADIANT H SI2natural100$51,353 NZD
233.02ct ROUND F VS1natural100$124,654 NZD
243.01ct CUSHION J VS2natural100$18,087 NZD
253.01ct OVAL I SI2natural100$24,446 NZD
263.01ct ROUND H SI2natural100$26,466 NZD
273.01ct ROUND F SI2natural100$31,163 NZD
283.01ct OVAL J SI2natural100$36,331 NZD
293.01ct OVAL K SI1natural100$38,171 NZD
303.01ct OVAL F SI1natural100$68,231 NZD
313.01ct OVAL G VVS2natural100$71,680 NZD
323.01ct ROUND G VS2natural100$90,099 NZD
332.68ct CUSHION D VS1natural100$34,316 NZD
342.53ct ROUND I SI2natural100$28,131 NZD
352.52ct OVAL D VS1natural100$80,020 NZD
362.51ct OVAL D VVS1natural100$61,615 NZD
372.50ct ROUND H VVS2natural100$33,321 NZD
382.42ct ROUND I VVS1natural100$24,047 NZD
392.34ct ROUND G SI2natural100$13,912 NZD
402.20ct HEART I VS2natural100$27,712 NZD
412.20ct ROUND H VS1natural100$39,021 NZD
422.12ct ROUND E VVS1natural100$49,176 NZD
432.08ct ASSCHER F VS2natural100$28,170 NZD
442.05ct ROUND H VS1natural100$18,332 NZD
452.04ct ROUND I SI1natural100$22,732 NZD
462.03ct ROUND H VS1natural100$24,156 NZD
472.03ct EMERALD D VVS1natural100$61,312 NZD
482.02ct OVAL I SI1natural100$18,764 NZD
492.02ct ASSCHER J VVS1natural100$22,216 NZD
502.02ct CUSHION F SI1natural100$29,323 NZD
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