And hurry no wrong answers . where are gemstones found? give examples.

It is important to distinguish where gems are formed from where they are found. 

Almost all gems are formed below the Earth's surface. 

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )