No. Mychiam doesn't appear to be a Hebrew word.
The Hebrew word for jewel depends:
If you are talking about just the stone: even chen (×בן חן)
if you are talking about anything that includes metal: tachshit (תכשיט)
The Hebrew word for jewel is "ehven khen" (אבן חן) which means "graceful stone". But this isn't a name in Hebrew.
Jewels, as a name, has no Hebrew translation. The word for "jewels" is "tahkh-shee-teem", but this is not used as a name in Hebrew.
gem or jewel = EH-ven toh-VAH (literally "good stone")
The Latin word for jewel is "gemma."
The word for "jewel" in Korean is 보석 (bo-seok).
There is no Hebrew word for "an." There is no indefinite article in Hebrew.
Calalini is not a Hebrew word and has no meaning in Hebrew.
The word is spelled jewel. The variants are: jewel jewelry jeweled
There are two syllables in the word jewel. Jew-el.
The word "womack" doesn't have a Hebrew definition.The word "womack" doesn't have a Hebrew word. It's a name. You can spell it ווֹמאק in Hebrew letters.
diestra has no meaning in Hebrew. This is not a Hebrew word.
Sydney is not a Hebrew word. It has no meaning in Hebrew.