Modifiers matching diamond:

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

Simple categories matching blue:

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