The shell bone script for character King is
the top is ax handle, the bottom is the ax. In 3000+ years ago, China was in early of Bronze Age, people made big ax for King. So big as means the power of King.
The bronze script for King is
It is clear that the bottom is ax.
The big seal script for King is
which the curve of the bottom became a line, which is a simplification of the bronze script.
All strokes are straight lines.
The clerical script for King is
王 is also a popular family name.
Now let's see the shell bone script for Jade
three pieces of jade connected by a rope, which is totally different from the shell bone script of King.
The big seal script for Jade is
Now we see almost same image as that of big seal script of King. However, if we compare the two carefully, we can find the difference.
The big seal of King has the middle line or stroke closer to the top line because it is an ax, top two lines represent the handle, which is close. The big seal script of Jade has the middle line in the middle or a little bit closer to the bottom line because there are pieces of Jade, the distance between pieces is same or close.
The small seal script for Jade is
Compare it with the small seal script of King, we can find the distance between the horizontal lines in Jade is same, and different in King.
The clerical script for Jade is
it looks like the clerical script of King except the dot in the right bottom, which is added to distinguish the two characters.
The pinyin for 玉 is Yu4.
We see 王 radical in many characters, it is really a 玉, not 王. We call it as 斜玉旁 - skew jade radical. There is no dot in the jade radical because the old script of Jade has no dot.