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A-Z OF DAY-DATE STONE DIALS<br />
Agate<br />
Ammonite<br />
Aventurine<br />
Bloodstone<br />
Cacholong<br />
Coral<br />
Ferrite<br />
Fossil<br />
Grossular<br />
Jade<br />
Jasper<br />
Lapis Lazuli<br />
a rock consisting primarily of<br />
cryptocrystalline silica, chiefly chalcedony,<br />
alternating with microgranular quartz. It is<br />
characterized by its fineness of grain and<br />
variety of color<br />
the most commonly known fossil, it is the<br />
hard shell of an ancient, extinct mollusk<br />
a form of quartz, characterized by its<br />
translucency and the presence of mineral<br />
inclusions that give a shimmering or<br />
glistening effect<br />
a cryptocrystalline mixture of quartz. The<br />
“classic” bloodstone is opaque green jasper<br />
with red inclusions of hematite<br />
a form of common opal, although it is often<br />
mistaken for agate or chalcedony<br />
the hard skeleton of red coral branches<br />
a ceramic material made by mixing and<br />
firing large proportions of iron with small<br />
proportions of one or more additional metallic<br />
elements, such as barium, manganese, nickel,<br />
and zinc<br />
also known by collectors as ‘Jurassic Park’<br />
dials, they are petrified fossil slices<br />
a vibrant red calcium-aluminium species of<br />
the garnet group of minerals<br />
an ornamental mineral, mostly known for its<br />
green varieties<br />
an aggregate of microgranular quartz and/<br />
or chalcedony and other minerals. It’s usually<br />
red, yellow, brown or green in color<br />
a metamorphic rock used as a semi-precious<br />
stone that is prized for its intense blue color<br />
Malachite<br />
Meteorite<br />
Mother of<br />
Pearl (Nacre)<br />
Marble<br />
(Howlite)<br />
Obsidian<br />
Opal<br />
Onyx<br />
Pietersite<br />
a green copper mineral, known for its vibrant<br />
greencolorandagate-likebandingthatshows<br />
different shades of green<br />
a nickel and iron alloy with heavy traces<br />
of cobalt and phosphorus. It is the crystal<br />
composition of this meteorite that gives it<br />
its octahedrite structure that is so visually<br />
appealing<br />
an iridescent organic composite material that<br />
is very strong produced by some molluscs as<br />
an inner shell layer<br />
a calcium borosilicate hydroxide, it has a<br />
white appearance with threaded gray, black or<br />
brown veins running through it<br />
a naturally occurring volcanic glass formed as<br />
rock, obsidian is produced when lava extruded<br />
from a volcano cools rapidly with minimal<br />
crystal growth<br />
formed when water from rain seeps down into<br />
crevasses in rock. Once the water evaporates,<br />
the silica that is left behind dries out and<br />
hardens into precious opal<br />
formed of bands of chalcedony in alternating<br />
colors. The most common color used by Rolex<br />
is the black bands<br />
a variety of Quartz, composed naturally<br />
of Tiger Eye, Hawk’s Eye and Jasper. Its<br />
dominant gold hues are contrasted with<br />
deep blue-black, gray and brown, as well as<br />
occasional clear areas<br />
VINTAGE 153
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