This may not be enough information but the only one I am aware of is the Ruby.
Garnets are red too.
Rubellite, Almandine, Carnelian, Ruby Jack(Red variety of Sphalerite), Red Beryl, PYROPE, CROCOITE, RED AVENTURINE, RED JASPER, RHODONITE
Ruby
Garnet
Diamond is an allotrope of the element carbon, so may be classified as a mineral (it can be colored by elemental impurities). About 20% of all diamonds mined are gem-quality stones, leaving the remainder to be classified as industrial diamonds. Diamond is not an ore.
Maybe a few! -and not be red or grey clay either.
If you mean gem as in a great thing, then Youkon's known gem in potatoes. The mineral gem, however, is gold.
A diamond is a mineral, but it be called a "gem stone" if you want to be fancy. Stones are usually round, and is a very broad subject. It varies from very expensive to just a regular old by-the-sidewalk stone. I would say that the best description of a diamond is a crystal.
cameo is a sculpted gem
green blue red black yellow brownish light brownish
There are a number of gem stones that are red in color including ruby, garnet, amethyst, almandine, pyrope, and rubellite.
Stones that are rare, and look beautiful are considered Gems.
There are a number of purple stones - including amethysts. Rubies are generally shades of red. If the corundum is not red, it is called a sapphire. Purple/violet gem stones include amethyst, sugilite, charoite, tanzanite, iolite, and spinel.
diamonds or stones
over 50
it is used for gem stones.
typesof precious gem
Getting good gem stones can be purchased on the internet, or by collectors. Jewelers are also likely to have great gem stones that one can use, depending on their preferences.
A red gemstone is commonly referred to as a "red gem." Some of the most popular and well-known red gems include ruby, garnet, spinel, and tourmaline. Each of these stones has a unique color and set of properties that make them desirable for use in jewelry and other decorative items.
gems
Amethyst is the first that comes to mind (and perhaps the most popular) but you can get a variety of purple gem stones.