Gemstone encyclopedia

Every gemstone, explained

What each stone is, how it wears in jewellery, and what to ask before you choose one. Browse by colour, or go straight to a letter.

This encyclopedia is educational. Inclusion does not confirm current Ralph Jacobs stock, sourcing, availability or suitability for a particular jewellery design.

Search gemstones

Material type

Colour

Explore birthstones Clear all

More filters

Scientific classification

Recognised source relationship

All A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

3 of 27 gemstone entries

Active filters Letter: L

Laboratory-grown Laboratory-grown diamond Hardness 10 Quick view
Laboratory-grown Laboratory-grown moissanite Hardness 9.25 Quick view
Labradorite Hardness 6–6.5 Quick view

Individual gemstones vary · care depends on treatment, setting and condition · birthstone traditions vary · encyclopedia inclusion does not confirm availability.