Y necklace
Usually 16 to 18 inches in length, this style of necklace gets its name
from its shape which features a dangle forming a Y-shape around the neck.
YAG
YAG is an actonym for yttrium aluminum garnet, a man-made imitation diamond.
This imitation stone lacks the fire of a natural diamond.
Yellow Gold
Yellow gold is gold that has been alloyed with a mix of 50% copper and
50% silver.
Yowah Nut
A form of Boulder Opal from Yowah (Queensland), Australia. It occurs most
often as nut-sized ironstone nodule containing pockets and veins of vivid
precious opal.
Yttrium
A silvery metallic element of the boron-aluminum group, found in gadolinite
and other rare minerals, and extracted as a dark gray powder. Not a rare
earth but occurring in nearly all rare-earth minerals, used in various
metallurgical applications, notably to increase the strength of magnesium
and aluminum alloys.
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