| BLUEJOHN | A purple-blue variety of fluorite occurring only in Derbyshire (4,4) |
| TIARA | A purple-blue lavender with white bracts - used to decorate one's head (5) |
| SAPPHIRE | Clear, hard, usually blue variety of corundum used as a gemstone (8) |
| SEASONAL | Occurring only at particular times of the year |
| NEBULOUS | Indistinct blue variety no American held (8) |
| SKULLCAP | Plant of the mint family with violet-blue tube-like flowers; or, a safety helmet used by jockeys and other equestrians (8) |
| ACONITUM | Latin name of a poisonous plant with violet-blue flowers, commonly called wolfsbane or monkshood (8) |
| LAPISLAZULI | A brilliant blue variety of a rare mineral, used as a gemstone (5,6) |
| INFRADIG | Far out wearing violet-blue, almost demeaning (5,3) |
| AEROBIC | Occurring only in the presence of oxygen |
| HEN | Some soldiers from Delaware supposedly took a blue variety of this along when they fought in the American Revolution |
| AMETHYST | Violet-blue gemstone |
| AQUAMARINE | Pale greenish-blue variety of beryl used as a gemstone (10) |
| SARD | Banks of river littered with blue variety of chalcedony (4) |
| LAPIS | Brilliant blue variety of the mineral lazurite (5,6) |
| LAZULI | Brilliant blue variety of the mineral lazurite (5,6) |
| MENTAL | Occurring only in the mind (6) |
| INDIGO | A violet-blue dye obtained from leaves, woad, or produced synthetically |
| TUDOR | A violet-blue clematis - for Henry VIII's house? (5) |
| DANISH | - blue; variety of cheese (6) |
