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 | 5.12ct OVAL E VVS2 | lab grown | 100 | $13,123 SGD |
| 7 | 5.11ct HEART D IF | lab grown | 100 | $17,356 SGD |
| 8 | 5.06ct OVAL E IF | lab grown | 100 | $17,186 SGD |
| 9 | 5.04ct HEART E IF | lab grown | 100 | $14,429 SGD |
| 10 | 5.02ct OVAL H SI1 | natural | 100 | $138,789 SGD |
| 11 | 5.01ct ROUND H SI2 | natural | 100 | $58,512 SGD |
| 12 | 5.01ct CUSHION G SI1 | natural | 100 | $82,783 SGD |
| 13 | 4.71ct HEART D IF | lab grown | 100 | $11,642 SGD |
| 14 | 4.56ct OVAL D VVS1 | lab grown | 100 | $14,916 SGD |
| 15 | 4.50ct ROUND H VVS1 | natural | 100 | $48,179 SGD |
| 16 | 4.24ct ROUND D VVS1 | lab grown | 100 | $5,950 SGD |
| 17 | 4.22ct ROUND D VVS1 | lab grown | 100 | $5,362 SGD |
| 18 | 4.21ct OVAL D VVS1 | lab grown | 100 | $8,526 SGD |
| 19 | 4.16ct HEART D IF | lab grown | 100 | $10,670 SGD |
| 20 | 4.07ct OVAL H VVS2 | natural | 100 | $89,793 SGD |
| 21 | 4.03ct PRINCESS I VS2 | natural | 100 | $63,728 SGD |
| 22 | 4.03ct HEART E VS2 | natural | 100 | $101,939 SGD |
| 23 | 4.02ct HEART H SI1 | natural | 100 | $50,540 SGD |
| 24 | 4.01ct ROUND J SI1 | natural | 100 | $38,001 SGD |
| 25 | 4.01ct ROUND H SI2 | natural | 100 | $42,651 SGD |
| 26 | 3.96ct OVAL D FL | lab grown | 100 | $17,265 SGD |
| 27 | 3.91ct OVAL E VS1 | lab grown | 100 | $1,678 SGD |
| 28 | 3.79ct ASSCHER D FL | lab grown | 100 | $16,486 SGD |
| 29 | 3.67ct PRINCESS D VVS1 | lab grown | 100 | $5,288 SGD |
| 30 | 3.62ct ASSCHER G VVS2 | lab grown | 100 | $2,826 SGD |
| 31 | 3.60ct OVAL E VVS1 | lab grown | 100 | $10,012 SGD |
| 32 | 3.57ct HEART D IF | lab grown | 100 | $6,881 SGD |
| 33 | 3.52ct OVAL E VS2 | lab grown | 100 | $8,449 SGD |
| 34 | 3.52ct OVAL J SI1 | natural | 100 | $38,295 SGD |
| 35 | 3.51ct MARQUISE E VS2 | lab grown | 100 | $2,249 SGD |
| 36 | 3.42ct ROUND E VVS1 | lab grown | 100 | $3,297 SGD |
| 37 | 3.33ct ASSCHER L VS1 | natural | 100 | $28,737 SGD |
| 38 | 3.28ct ROUND F VS1 | lab grown | 100 | $903 SGD |
| 39 | 3.28ct PRINCESS E VVS2 | lab grown | 100 | $9,465 SGD |
| 40 | 3.26ct OVAL E IF | lab grown | 100 | $5,744 SGD |
| 41 | 3.17ct ROUND D VVS1 | lab grown | 100 | $1,259 SGD |
| 42 | 3.10ct HEART I SI2 | natural | 100 | $16,059 SGD |
| 43 | 3.09ct CUSHION D VVS2 | lab grown | 100 | $3,636 SGD |
| 44 | 3.08ct OVAL G VS1 | lab grown | 100 | $2,786 SGD |
| 45 | 3.07ct OVAL E VS2 | lab grown | 100 | $1,577 SGD |
| 46 | 3.07ct OVAL G VS1 | lab grown | 100 | $2,668 SGD |
| 47 | 3.05ct OVAL E VS2 | lab grown | 100 | $1,572 SGD |
| 48 | 3.05ct OVAL K SI1 | natural | 100 | $22,336 SGD |
| 49 | 3.04ct ROUND D VVS1 | lab grown | 100 | $3,226 SGD |
| 50 | 3.04ct HEART I SI2 | natural | 100 | $14,331 SGD |
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