A gem can have a name and a verb. As a noun, it has four meanings:

gemstone

B) Watch bearings are all natural or man-made products.

C) Precious gemstone jewelry or gold and silver utensils. -That's jewelry.

D) precious or valuable items.

Verbs are decorated with jewelry or jewelry.

Jewelry is just a noun, its main meaning is jewelry worn by individuals to express artistic or commercial activities related to it.

Therefore, as a noun, the biggest difference between the two is whether jewel is a real gem or a jewel ornament; Jewelry refers to decorations (necklaces, rings, etc.). ) people wear it. Jewel directly pointed out that the price is expensive; Jewellry, on the other hand, didn't make it clear. It may be expensive, or it may be an ordinary ornament that everyone can afford.

Jewelry can be counted, so your statement (except for spelling mistakes) is basically correct (you need to limit these two jewels).

These two jewels are very valuable.