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)
15.12ct OVAL E VVS2lab grown100$17,895 NZD
25.11ct HEART D IFlab grown100$23,668 NZD
35.06ct OVAL E IFlab grown100$23,436 NZD
45.04ct HEART E IFlab grown100$19,676 NZD
54.71ct HEART D IFlab grown100$15,875 NZD
64.56ct OVAL D VVS1lab grown100$20,340 NZD
74.24ct ROUND D VVS1lab grown100$8,113 NZD
84.22ct ROUND D VVS1lab grown100$7,311 NZD
94.21ct OVAL D VVS1lab grown100$11,627 NZD
104.16ct HEART D IFlab grown100$14,550 NZD
113.96ct OVAL D FLlab grown100$23,543 NZD
123.91ct OVAL E VS1lab grown100$2,289 NZD
133.79ct ASSCHER D FLlab grown100$22,481 NZD
143.67ct PRINCESS D VVS1lab grown100$7,211 NZD
153.62ct ASSCHER G VVS2lab grown100$3,853 NZD
163.60ct OVAL E VVS1lab grown100$13,652 NZD
173.57ct HEART D IFlab grown100$9,383 NZD
183.52ct OVAL E VS2lab grown100$11,521 NZD
193.51ct MARQUISE E VS2lab grown100$3,067 NZD
203.42ct ROUND E VVS1lab grown100$4,496 NZD
213.28ct ROUND F VS1lab grown100$1,232 NZD
223.28ct PRINCESS E VVS2lab grown100$12,907 NZD
233.26ct OVAL E IFlab grown100$7,833 NZD
243.17ct ROUND D VVS1lab grown100$1,717 NZD
253.09ct CUSHION D VVS2lab grown100$4,958 NZD
263.08ct OVAL G VS1lab grown100$3,799 NZD
273.07ct OVAL E VS2lab grown100$2,150 NZD
283.07ct OVAL G VS1lab grown100$3,638 NZD
293.05ct OVAL E VS2lab grown100$2,143 NZD
303.04ct ROUND D VVS1lab grown100$4,399 NZD
313.03ct OVAL D VVS1lab grown100$6,085 NZD
323.02ct EMERALD D VS1lab grown100$1,509 NZD
333.02ct OVAL E VS2lab grown100$3,590 NZD
343.02ct OVAL D VVS1lab grown100$6,064 NZD
353.02ct HEART D IFlab grown100$8,023 NZD
363.01ct ROUND F VS1lab grown100$1,131 NZD
373.01ct OVAL D VS1lab grown100$9,096 NZD
383.01ct ROUND D IFlab grown100$15,120 NZD
392.94ct OVAL E VS1lab grown100$3,534 NZD
402.92ct OVAL E VS1lab grown100$3,512 NZD
412.90ct HEART D VVS1lab grown100$3,701 NZD
422.84ct RADIANT E VS1lab grown100$1,646 NZD
432.80ct HEART D IFlab grown100$6,415 NZD
442.71ct OVAL F VS2lab grown100$5,475 NZD
452.70ct OVAL E VS2lab grown100$3,439 NZD
462.67ct ROUND D VVS1lab grown100$3,732 NZD
472.64ct OVAL D VVS1lab grown100$8,732 NZD
482.61ct OVAL D VS2lab grown100$2,361 NZD
492.58ct OVAL F VS1lab grown100$1,247 NZD
502.58ct RADIANT F VS1lab grown100$3,094 NZD
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