Found the Perfect Girl; Now Find the Perfect Diamond
By Fred Cuellar
Author of How to Buy a Diamond

Gemstones also have specific meanings (besides your eternal love for her, of course):

Sincerity: Sapphire

A gift of this gem says you're not just kidding around.

Electricity: Tourmaline

Squeeze this gem and it gives off electricity. Give it and create sparks.

Passion: Ruby

The ancients believed this gem contained an unquenchable fire.

Marital Harmony: Aquamarine

Say you're sorry, give her this gem and promise that it will never, ever, happen again.

Fertility: Emerald

This gemstone may not help create quintuplets, but twins aren't out of the question.

Love: Emerald

The gem of Venus says love lot more persuasively than a dozen roses.

Hope: Opal

Show your faith that things will work out.

Now all you have to do is figure out her ring size...