Top 50 Diamonds by Certification Score in Singapore
Ranked by certificate rigour. GIA and AGS stones with complete grading, clear symmetry, and verified provenance come out on top. Pricing shown in SGD.
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 (SGD) |
|---|---|---|---|---|
| 1 | 8.04ct ROUND K SI1 | natural | 100 | $157,168 SGD |
| 2 | 8.03ct OVAL G VS2 | natural | 100 | $498,064 SGD |
| 3 | 7.03ct CUSHION F VS2 | natural | 100 | $378,810 SGD |
| 4 | 7.01ct PEAR I SI2 | natural | 100 | $113,735 SGD |
| 5 | 5.30ct CUSHION D FL | natural | 100 | $242,699 SGD |
| 6 | 5.02ct OVAL H SI1 | natural | 100 | $138,789 SGD |
| 7 | 5.01ct ROUND H SI2 | natural | 100 | $58,512 SGD |
| 8 | 5.01ct CUSHION G SI1 | natural | 100 | $82,783 SGD |
| 9 | 4.50ct ROUND H VVS1 | natural | 100 | $48,179 SGD |
| 10 | 4.07ct OVAL H VVS2 | natural | 100 | $89,793 SGD |
| 11 | 4.03ct PRINCESS I VS2 | natural | 100 | $63,728 SGD |
| 12 | 4.03ct HEART E VS2 | natural | 100 | $101,939 SGD |
| 13 | 4.02ct HEART H SI1 | natural | 100 | $50,638 SGD |
| 14 | 4.01ct ROUND J SI1 | natural | 100 | $38,001 SGD |
| 15 | 4.01ct ROUND H SI2 | natural | 100 | $42,651 SGD |
| 16 | 3.52ct OVAL J SI1 | natural | 100 | $38,295 SGD |
| 17 | 3.33ct ASSCHER L VS1 | natural | 100 | $28,737 SGD |
| 18 | 3.10ct HEART I SI2 | natural | 100 | $16,059 SGD |
| 19 | 3.05ct OVAL K SI1 | natural | 100 | $22,336 SGD |
| 20 | 3.04ct HEART I SI2 | natural | 100 | $14,331 SGD |
| 21 | 3.04ct OVAL J SI2 | natural | 100 | $20,479 SGD |
| 22 | 3.02ct RADIANT H SI2 | natural | 100 | $37,659 SGD |
| 23 | 3.02ct ROUND F VS1 | natural | 100 | $91,413 SGD |
| 24 | 3.01ct CUSHION J VS2 | natural | 100 | $13,264 SGD |
| 25 | 3.01ct OVAL I SI2 | natural | 100 | $17,927 SGD |
| 26 | 3.01ct ROUND H SI2 | natural | 100 | $19,408 SGD |
| 27 | 3.01ct ROUND F SI2 | natural | 100 | $22,853 SGD |
| 28 | 3.01ct OVAL J SI2 | natural | 100 | $26,642 SGD |
| 29 | 3.01ct OVAL K SI1 | natural | 100 | $27,992 SGD |
| 30 | 3.01ct OVAL F SI1 | natural | 100 | $50,036 SGD |
| 31 | 3.01ct OVAL G VVS2 | natural | 100 | $52,566 SGD |
| 32 | 3.01ct ROUND G VS2 | natural | 100 | $66,072 SGD |
| 33 | 2.68ct CUSHION D VS1 | natural | 100 | $25,165 SGD |
| 34 | 2.53ct ROUND I SI2 | natural | 100 | $20,629 SGD |
| 35 | 2.52ct OVAL D VS1 | natural | 100 | $58,681 SGD |
| 36 | 2.51ct OVAL D VVS1 | natural | 100 | $45,185 SGD |
| 37 | 2.50ct ROUND H VVS2 | natural | 100 | $24,435 SGD |
| 38 | 2.42ct ROUND I VVS1 | natural | 100 | $17,635 SGD |
| 39 | 2.34ct ROUND G SI2 | natural | 100 | $10,202 SGD |
| 40 | 2.20ct HEART I VS2 | natural | 100 | $20,322 SGD |
| 41 | 2.20ct ROUND H VS1 | natural | 100 | $28,615 SGD |
| 42 | 2.12ct ROUND E VVS1 | natural | 100 | $36,063 SGD |
| 43 | 2.08ct ASSCHER F VS2 | natural | 100 | $20,658 SGD |
| 44 | 2.05ct ROUND H VS1 | natural | 100 | $13,444 SGD |
| 45 | 2.04ct ROUND I SI1 | natural | 100 | $16,670 SGD |
| 46 | 2.03ct ROUND H VS1 | natural | 100 | $17,715 SGD |
| 47 | 2.03ct EMERALD D VVS1 | natural | 100 | $44,962 SGD |
| 48 | 2.02ct OVAL I SI1 | natural | 100 | $13,760 SGD |
| 49 | 2.02ct ASSCHER J VVS1 | natural | 100 | $16,292 SGD |
| 50 | 2.02ct CUSHION F SI1 | natural | 100 | $21,503 SGD |
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