- Deep-red gemstone : Ruby
- In “SpongeBob SquarePants”, a whale character shares a name with this gemstone : Pearl
- What is this gemstone? : Emerald
- This blue gemstone is the traditional gift for a 45th wedding anniversary : Sapphire
- The birthstone for October is this gemstone : Opal
- This gemstone is the hardest mineral in the world : Diamond
- In the Middle Ages, any yellow gemstone was referred to as this : Topaz