What is the most expensive semi-precious gemstone?

Semi-precious gemstones are those that come in a wide variety of colors and textures. They are valuable, often used as decorative pieces or jewelry. A semi-precious stone may be considered precious if it is rare enough to be used for jewelry or other ornamental purposes, but not valuable enough to be considered a true gemstone.

Aquamarine

Aquamarine is a semi-precious gemstone that’s often mistaken for an emerald. It’s found in shades of blue and green, but can also be gray or brown. The stone gets its name from the Latin word for water, aqua, and was believed to protect its owners from drowning by sailors who wore it around their necks on long voyages.

Citrine

Citrine is a variety of quartz that has been heated to high temperatures. It’s often found in the same places as amethyst, but can also be found in Brazil and Madagascar. Citrine is sometimes used as an alternative to emeralds because it has a similar color and appearance; however, it does not have the same hardness or durability as emeralds do.

Garnet

Garnet is one of the most popular semi-precious gemstones. It’s been around for thousands of years and has been used in jewelry since ancient times. Garnet comes in many colors, including red, pink and purple; it also has various shades within each color range.
Garnets are inexpensive compared to other precious stones but still beautiful and durable enough to withstand wear and tear better than other precious stones such as diamonds or rubies (which can chip easily).

Opal

Opal is a semi-precious gemstone that has been around for thousands of years. It was first known to be used by the ancient Egyptians, who used it as an eye cosmetic and ornamentation. The stone changes color depending on its surroundings, which makes it highly sought after by collectors and jewelry makers alike.
Opals come in many different colors including white, black and even blue! They are formed when water seeps into cracks in rocks over time creating layers upon layers of silica gel that forms opals’ beautiful patterns when exposed to light (which is why they change color).