You say you love to deal with Astrology, do I understand that you have good knowledge about astrology. As you are passing through the Venus Mahadasha and Venus is your 9th house lord , which is the Bhagystan or the house of destiny. You can wear Diamond or a White Sapphire or can be a Opal also. One thing you should know that when you wear any stone for astrological purposes, it should always touch the skin. You will wear it on your right hand middle finger on Friday Morning.