There are 21 cards in this "Gemstone" series of cards for Sailor Stars. Each card coresponds to one of 21 gemstones, picture on the front and described on the back.
I believe these cards are normally only sold through vending machines.
1 2 3 PZ (Saphire) Sailors Star Healer, Fighter and Maker with Eternal Sailor Moon 4 P (Amethyst) Sailor Star Fighter attacking. 5 P (Opal) Sailor Star Maker attacking. 6 P (Moon Stone) Sailor Star Healer attacking. 7 P (Alexandrite) Sailor Star Fighter. 8 P (Peridot) Sailor Star Maker. 9 P (Lapis Lazuli) Sailor Star Healer. 10 P (Garnet) Sailor Star Fighter. 11 12 13 P (Emerald) Eternal Sailor Moon and Sailors Star Fighter, Maker and Healer. 14 15 P (Cat's Eye) Eternal Sailor Moon looking back over her shoulder. 16 P (Turquoise) Eternal Sailor Moon with Eternal Tial. 17 P (Aquamarine) Eternal Sailor Moon in front of Chibi-Chibi. 18 P (Topaz) SD Eternal Sailor Moon and SD Chibi-Chibi. 19 P (Pink Tourmaline) Chibi-Chibi with umbrella. 20 P (Coral) Chibi-Chibi winking. 21 P (Pearl) Sailors Venus, Mercury, Moon, Jupiter, and Mars.