You know a simple Google would have revealed this, and I HAVE given you this link before;
http://www.gamefaqs.com/computer/doswin/file/920601/35591)
Personal Crystal:
qcrystal_1_0 - Very Dark: Level 1
qcrystal_2_0 - Very Dark: Level 2
qcrystal_3_0 - Very Dark: Level 3
qcrystal_4_0 - Very Dark: Level 4
qcrystal_5_0 - Very Dark: Level 5
qcrystal_6_0 - Very Dark: Level 6
qcrystal_7_0 - Very Dark: Level 7
qcrystal_8_0 - Very Dark: Level 8
qcrystal_9_0 - Very Dark: Level 9
qcrystal_1_1 - Dark: Level 1
qcrystal_2_1 - Dark: Level 2
qcrystal_3_1 - Dark: Level 3
qcrystal_4_1 - Dark: Level 4
qcrystal_5_1 - Dark: Level 5
qcrystal_6_1 - Dark: Level 6
qcrystal_7_1 - Dark: Level 7
qcrystal_8_1 - Dark: Level 8
qcrystal_9_1 - Dark: Level 9
qcrystal_1_2 - Neutral: Level 1
qcrystal_2_2 - Neutral: Level 2
qcrystal_3_2 - Neutral: Level 3
qcrystal_4_2 - Neutral: Level 4
qcrystal_5_2 - Neutral: Level 5
qcrystal_6_2 - Neutral: Level 6
qcrystal_7_2 - Neutral: Level 7
qcrystal_8_2 - Neutral: Level 8
qcrystal_9_2 - Neutral: Level 9
qcrystal_1_3 - Light: Level 1
qcrystal_2_3 - Light: Level 2
qcrystal_3_3 - Light: Level 3
qcrystal_4_3 - Light: Level 4
qcrystal_5_3 - Light: Level 5
qcrystal_6_3 - Light: Level 6
qcrystal_7_3 - Light: Level 7
qcrystal_8_3 - Light: Level 8
qcrystal_9_3 - Light: Level 9
qcrystal_1_4 - Very Light: Level 1
qcrystal_2_4 - Very Light: Level 2
qcrystal_3_4 - Very Light: Level 3
qcrystal_4_4 - Very Light: Level 4
qcrystal_5_4 - Very Light: Level 5
qcrystal_6_4 - Very Light: Level 6
qcrystal_7_4 - Very Light: Level 7
qcrystal_8_4 - Very Light: Level 8
qcrystal_9_4 - Very Light: Level 9