Imitation sapphires are most commonly found antique jewelry in the form of sapphire doublets and triplets, which are composite stones. Composite stones are jewelry pieces comprised of more than one stone bonded together.

Sapphire doublets
Sapphire doublets were first used in antique jewelry. There are two types of sapphire doublets - the true doublet and the false doublet.

True sapphire doublets are created using two genuine sapphires and then bonding them together to form a single, larger sapphire of better color than the originals. For example, using two pale yellow sapphires with a deep blue glue will create a larger, blue composite stone.

False sapphire doublets consist of a thin slab of sapphire that is glued on top of a colored glass bottom to form a large composite sapphire.

See other names for fake sapphires for a list of names and materials used.