There are different ways to cleanse your crystals. They can be purified with incense, in the earth, under the moonlight, visualization and water. In order to use water as a method to cleanse your crystals, it is good to know which crystals can withstand water. This is so that the crystal does not lose its luster, dissolve or, for example, rust. To determine whether your crystals can withstand water, it is the hardness of the crystal that you look for. This can be checked using the Mohs Hardness Scale .

The crystals that are 6 or higher on the Mohs Hardness scale can be cleaned well in water. But there are also some exceptions that can be good to remember. Some minerals can also leach toxic chemicals into the water, especially if left in water for a long time.

Here's how to cleanse your crystals with water:

Hold the crystal under running tap water, basement water, seawater or lake water. Visualize that you are purifying your crystal when you hold it in water. Hold the crystal under water until it feels clean.

Should not be cleaned in water
2: 
Selenite
Amber

3:
Celestine
Lepidolite
Ruby Fuchsite
Chrysocolla
Howlite

4:
Fluorite
Calcite
Angelite  
Shungite (can be cleaned in water)
Malachite - (not in water) - it contains copper and should not come into contact with water as a chemical reaction may occur.

5:
Hematite
Apatite
Sodalite  
Obsidian  
Dalmatians Jasper

Can be cleaned in water
6:
Moonstone
Lapis lazuli
Opal
Turquoise
Sun stone
Rhodonite
Garnet
Amazonite
Pyrite ( not in water ) - can start to rust
Jade ( not in water ) - the surface may become pale
Labradorite ( not in water ) - risks dissolving

7:
Agate
Amethyst
Rose quartz
Smoky quartz
Rock crystal
Aventurine
Citrine
Strawberry quartz
Chalcedony
Carnelian
Onyx
Tiger's eye
Aquamarine
Tourmaline
Golden Healer
Jasper

8:
Emerald
Topaz

9:
Ruby

10.
Diamond