Page "Doublet (lapidary)" Paragraph 2
from
Wikipedia
A garnet and glass doublet uses a top portion of natural garnet fused to any color of glass to imitate a gem.
The color of glass used in the doublet is all that is seen, as the garnet provides no color.
If seen in reflected light, a separation line may be seen.
A harder garnet makes the stones more durable.
In the case of opal doublets, a backing layer of onyx or matrix ( ironstone ) gives the more fragile opal layer support and can make the opal look darker and higher quality.
Page 1 of 1.
2.476 seconds.