40d:Opal

"Opal" is the name of the eleventh month of the dwarven calendar, covering mid-Winter.

Opal is also a broad category of ornamental (low-value) and semi-precious (mid-value) gems. The exact gem will be one of a couple dozen specific types of opal, such as bandfire opal, pipe opal or pineapple opal.

Ornamental Opals

Rarity	Gem name	Value (×)	Color	Graphic	Found where	Found how
	amber opal	10×	A		All stone	Small clusters
	bone opal	10×	E		All stone	Small clusters
	cherry opal	10×	F		All stone	Small clusters
	gold opal	10×	I		All stone	Small clusters
	jasper opal	10×	E		All stone	Small clusters
	milk opal	10×	E		All stone	Small clusters
	moss opal	10×	B		All stone	Small clusters
	onyx opal	10×	E		All stone	Small clusters
	pineapple opal	10×	E		All stone	Small clusters
	pipe opal	10×	E		All stone	Small clusters
	prase opal	10×	B		All stone	Small clusters
	resin opal	10×	I		All stone	Small clusters
	shell opal	10×	E		All stone	Small clusters
	wax opal	10×	A		All stone	Small clusters
	wood opal	10×	A		All stone	Small clusters

Semi-Precious Opals

Rarity	Gem name	Value (×)	Color	Graphic	Found where	Found how
	bandfire opal	20×	E		All stone	Small clusters
	black opal	30×	K		All stone	Small clusters
	claro opal	20×	D		All stone	Small clusters
	crystal opal	20×	E		All stone	Small clusters
	fire opal	15×	F		All stone	Small clusters
	harlequin opal	20×	E		All stone	Small clusters
	jelly opal	15×	A		All stone	Small clusters
	levin opal	20×	I		All stone	Small clusters
	pinfire opal	20×	E		All stone	Small clusters
	precious fire opal	20×	F		All stone	Small clusters
	red flash opal	20×	F		All stone	Small clusters
	white opal	20×	E		All stone	Small clusters

Superstitions

During the Middle Ages, opal was regarded as providing great luck to the wearer or owner, though during the Victorian era it shifted to being regarded as unlucky by superstitions engineered by established gem dealers. Some, however, thought that this was avoided if they were born in October, as opal is the birthstone for those born in October, or if the opal was received as a gift. As recently as the the reign of the last czar in the 20th Century, it was believed by some Russians that the opal embodied the evil eye, and they should not purchase anything from a dealer with opals.

It is possible that the Dwarves regard Opal as lucky like those during the Middle Ages, hence the ornamental opals having highest value of all ornamental gems.