What are the allusions in "The Gift of the Magi?"

"The Gift of the Magi" by O. Henry has three distinct
Biblical allusions -- the magi, King Solomon, and the Queen of Sheba.
 

The magi were three men that traveled from far away lands
in order to give gifts to the newly born Christ child.  Depending on who you ask, the
magi range from being simple wise men, to being kings. Regardless, all accounts agree
that the three men gave expensive gifts to Jesus (gold, frankincense, and myrrh).  Of
the three Biblical allusions in the story, the magi is the most overt.  It's in the
title of the story, and O. Henry explicitly tells his readers about them in the final
paragraph.  

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The magi, as you know, were wise men—wonderfully
wise men— who brought gifts to the newborn Christ-child. They were the first to give
Christmas gifts. Being wise, their gifts were doubtless wise
ones.

The allusions to the
Queen of Sheba and Solomon are much more veiled.  What O. Henry does though, by hinting
at Solomon and the Queen of Sheba, is pick two people who were historically crazy rich.
 From I Kings 10:

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And when the Queen of Sheba heard of the fame of
Solomon concerning the name of the LORD, she came to prove him with hard questions. And
she came to Jerusalem with a very great train, with camels that bore spices, and very
much gold, and precious
stones:

O. Henry hints at the
Queen of Sheba when he says that Della's hair was more beautiful and valuable than "any
queen’s jewels and gifts."  

As for King Solomon, the Bible
describes him this way:

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King Solomon was greater in riches and wisdom
than all the other kings of the
earth.

O. Henry tells his
readers that no king has ever had anything as valuable as Jim's watch. That king could
only be King Solomon.  

So despite the fact that Jim and
Della are dirt poor, they own things more valuable than any king or queen ever has, and
they willingly give those things up in order to give gifts to each other.  That's some
deep love.