Diamond refers to both a gemstone and a shape. In the metaphysical language of geometry, the diamond shape may stand in for the human eye or for the vagina.
Diamonds, whether carried or worn, promote self confidence in sexual matters. They relieve root causes of sexual dysfunction. They are a cleansing, releasing, purifying stone in matters of sexuality. These are spells that will, no doubt, please the target.
To stimulate someone to be mre sexually receptive toward you, bestow a gift of a diamond, magically charged with your own desires.
To heal your own sexual ihibitions and dysfunction, don't wait for someone else to bestow the gift. Provide your own diamond, charge it with your desires, bathe it in spring water enhanced with hibiscus flower essence, and wear it.
From: Encyclopedia of 5000 Spells