Modifiers matching diamond:

• hot,
• color,
• colored,
• coloured,
• beautiful,
• rough,
• blue,
• synthetic,
• natural,

Simple categories matching blue:

• item,
• fish,
• pigment,
• stain,
• fruit,
• decoration,
• food,
• berry,
• plant,
• crystal,
• object,
• state,
• indicator,
• subject,
• cheese,
• color,
• symbol,
• figure,
• material,
• diamond,
• box,
• flower,