String of Hearts silver glory 

String of Hearts (Ceropegia Linearis Woodii) also known as Rosary Vine, is a trailing semi-succulent, native to S. Africa.

How to care for your ceropegia - 

Water:  Less is more when it comes to watering; more tolerant of dry soil than wet, as it is prone to rot. Allow the soil to dry out completely between watering

Light: String of Hearts likes bright light - even some direct sun.

Humidity: They like 40-50% humidity.

Temperature: Average room temperature is fine, 18-24 degrees C.

Other info - 

Pot size: 8cm

Toxic to cats & dogs? No