Gemstone Varieties

noun a mineral that is a complex silicate of boron and aluminum, usually occurring in prismatic crystals of various colors

• Tourmaline is a precious gemstone that comes in a variety of colors.
• I bought a beautiful tourmaline necklace while on vacation.
• That tourmaline ring is totally lit!
• Her eyes sparkled like tourmaline in the sunlight.

noun a variety of tourmaline mineral that is colorless or very pale in color

• The achroite mineral is a type of tourmaline that is colorless and transparent.
• I found a cool achroite gemstone at the jewelry store.
• Check out this achroite rock I found while hiking!
• Her words were like achroite, pure and transparent, with no hidden meanings.

noun a type of gemstone that is a combination of agate and opal

• The agate opal is a type of gemstone known for its unique color patterns.
• I love the way the agate opal sparkles in the sunlight.
• That agate opal is totally lit!
• Her eyes shimmered like agate opals in the moonlight.

noun the hard outer covering of an egg or a mollusk

• The agate shell was intricately carved and polished to perfection.
• I found a cool agate shell on the beach today, wanna see?
• Check out this sick agate shell I scored at the souvenir shop!
• Her heart felt as delicate and beautiful as an agate shell.