The Zodiac is a circle of 360 degrees. There are 12 divisions, known as Houses, each of 30 degrees. Each House is ruled by a different planet. The twelve solar months are alloted to twelve Zodiac signs which symbolise the twelve Houses.

Zodiac House/Sign	Ruler	.	Gem	Effect
Aries	Mars		Red Coral	Independent work Promotions,Mental strength.
Taurus	Venus		Diamond	Wealth,Fame
Gemini	Mercury		Emerald	Success in Education & Profession, Turns Enemies into Friends
Cancer	Moon		Pearl	Financial Success, Comfortable life
Leo	Sun		Ruby	Success with Govt., & Society, Fame
Virgo	Mercury		Emerald	Knowledge, Fame
Libra	Venus		Diamond	Improvement in Finances, Promotions & Wealth
Scorpio	Mars		Red Coral	Success in Financial front
Sagittarius	Jupiter		Yellow Sapphire	Great Fortune,Good name in society & Healthy Life,Fame
Capricorn	Saturn		Blue Sapphire	Mentally and Physically active, Success in Land & Property cases , Unexpected Monetary gain
Aquarius	Saturn		Blue Sapphire	Success Prosperity
Pisces	Jupiter		Yellow Sapphire	Good Fortune

A planet if positioned in an enemy's house in a negative position or debilated or afflicted by other planets, it loses its strength and gives unfavourable effects. The particular gem related to the planet will not only ward off these negative effects,but also give positive effects. When the planet is favourable,the planet enhances its beneficial effects.