18K gold-plated necklace with natural geode gemstones

Necklace with two natural geode gemstones, extracted from the inside of an agate, with details in druse, with varied shapes and sizes.

Observation about the colors: because they are natural stones, the geodes have variations, ranging from the lightest to the darkest. 

Approximate overall pendant size: 8cm.
Approximate overall necklace size: 40cm + 7cm extender.
The stones vary from 2cm to 4cm.