The Main Gemstones for Leo

Rock Crystal~ intensifies positive vibrations; confidence and optimism
Larimar~ resolving old problems and new ways of thinking
Diamond~ leadership and personal and professional endeavors
Chrysoberyl~ improved relationships with partners
Topaz~ pink topaz is the lucky stone for Leos; honesty and sincerity

Others:

Onyx
Yellow-gold citrine
Garnet
Peridot
Selenite
Tiger's Eye
Tourmaline

Stomach and Intestinal Disorders

To promote regularity, use Beryl. To guard against inflammation, wear or apply red-brown jasper and take either moss opal or carnelian water. It is better to drink a glass over the course of a day. For ulcers, red-brown jasper helps in any form and topaz can help as well.