Possible Clues:

• Lozenge-shaped
• Like diamonds leaving West Bromwich, improbably
• Like diamonds making corrupt mob rich
• Initially rock hard one must be in cut of diamond
• Like a parallelogram with equal sides
• Shaped like a lozenge
• Just figure how there could be a medical degree in the choir
• Like diamonds of rich, randomly divided by disorderly mob
• Niels the physicist holding minute round iodine crystal, originally shaped like a diamond
• Diamond rich mob fancy