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Top 50 Diamonds by Certification Score in Hong Kong

Ranked by certificate rigour. GIA and AGS stones with complete grading, clear symmetry, and verified provenance come out on top. Pricing shown in HKD.

Last updated 31 October 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.

#DiamondOriginGradeLowest Price (HKD)
134.75ct ROUND F SI1naturalA+HK$18,278,496 HKD
230.17ct ROUND E FLnaturalA+HK$21,316,202 HKD
330.13ct RADIANT FANCY SI2naturalA+HK$3,073,082 HKD
423.69ct ROUND I SI2naturalA+HK$7,184,783 HKD
522.79ct EMERALD FANCY LIGHT BROWNISH YELLOW VS2naturalA+HK$2,226,639 HKD
622.02ct CUSHION FANCY VS2naturalA+HK$3,237,701 HKD
720.67ct RADIANT K VS2naturalA+HK$3,778,120 HKD
820.66ct ROUND H SI1naturalA+HK$6,295,978 HKD
920.58ct ROUND L SI2naturalA+HK$2,789,578 HKD
1020.45ct RADIANT H VS1naturalA+HK$7,285,852 HKD
1120.42ct OVAL D VS1naturalA+HK$12,801,138 HKD
1220.32ct OVAL D SI1naturalA+HK$11,574,228 HKD
1320.29ct EMERALD H VS1naturalA+HK$12,070,642 HKD
1420.28ct ROUND E VVS1naturalA+HK$15,115,526 HKD
1520.28ct EMERALD D FLnaturalA+HK$15,562,625 HKD
1620.21ct EMERALD J VS1naturalA+HK$4,541,562 HKD
1720.11ct HEART H VS2naturalA+HK$7,174,688 HKD
1820.07ct EMERALD D FLnaturalA+HK$15,286,323 HKD
1920.06ct OVAL H VS2naturalA+HK$7,049,793 HKD
2020.05ct PEAR FANCY YELLOW IFnaturalA+HK$4,699,865 HKD
2120.05ct EMERALD H VS2naturalA+HK$6,472,703 HKD
2220.01ct EMERALD L SI1naturalA+HK$3,276,286 HKD
2319.02ct EMERALD H VS2naturalA+HK$5,503,797 HKD
2418.03ct ROUND M VS1naturalA+HK$2,391,057 HKD
2518.00ct OVAL H VS1naturalA+HK$6,195,828 HKD
2617.84ct CUSHION E VS2lab grownA+HK$283,323 HKD
2717.14ct RADIANT FANCY YELLOW VS2naturalA+HK$2,116,494 HKD
2817.05ct EMERALD H VS1naturalA+HK$5,363,295 HKD
2916.72ct OVAL F VS2lab grownA+HK$219,209 HKD
3016.60ct CUSHION F VVS1naturalA+HK$12,714,428 HKD
3116.50ct OVAL J SI1naturalA+HK$4,457,862 HKD
3216.48ct OVAL F SI1lab grownA+HK$30,157 HKD
3316.45ct OVAL F SI1lab grownA+HK$46,698 HKD
3416.21ct RADIANT F VS2lab grownA+HK$209,188 HKD
3516.10ct ASSCHER D VVS2naturalA+HK$8,524,996 HKD
3616.09ct EMERALD F VS2lab grownA+HK$92,673 HKD
3716.08ct OVAL G VS2lab grownA+HK$45,701 HKD
3815.76ct OVAL E VS2lab grownA+HK$206,624 HKD
3915.71ct ROUND F VS2lab grownA+HK$159,432 HKD
4015.67ct OVAL F VS2lab grownA+HK$205,448 HKD
4115.63ct PEAR E FLnaturalA+HK$9,967,152 HKD
4215.61ct RADIANT G VVS2lab grownA+HK$208,481 HKD
4315.59ct CUSHION FANCY VS1naturalA+HK$1,829,162 HKD
4415.53ct CUSHION I SI2naturalA+HK$1,802,420 HKD
4515.45ct RADIANT G VS2lab grownA+HK$169,713 HKD
4615.38ct ROUND D IFnaturalA+HK$18,157,173 HKD
4715.27ct EMERALD H VS2lab grownA+HK$42,743 HKD
4815.21ct OVAL F VS1naturalA+HK$7,586,855 HKD
4915.20ct ROUND E SI1lab grownA+HK$78,096 HKD
5015.20ct ROUND E SI1lab grownA+HK$111,134 HKD
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