While thinking about some of the finer points of the rings, I hit on an idea.
First, an overview:
Of course, when Hal Jordan was introduced in 1959, comic books were printed on pulp paper, with a limited, four-color palette.
In-universe, the Green Lantern Corps’ rings were usually described as being made from alien metal (and, to this day, are usually drawn to simulate a polished, metallic look), although they have sometimes been described as “crystalline” in composition, as well. And, usually, when charged by their batteries (or just when in use), they’re shown to glow with green power.
Due to the limited coloring techniques of the day, the glow was depicted as a line-art energy effect, colored a lime-ish shade of green. The ring itself was uniformly colored the same shade of dark green as Green Lantern’s uniform. Presumably, the
entire ring was intended to be glowing, rather than just a portion of it.
And, even in the early days, when the V1 was the only model in existence, the ring was often described in dialogue as containing a “gem” or “crystal”. Indeed, in GREEN LANTERN Vol. 2 # 33, during a battle with Doctor Light, the “power-element” or “gem” was dislodged from its setting in the ring, with the artwork depicting a generic disc or sphere (perhaps intended to represent the symbol-disc, or a portion of it).
On a few occasions during the late 1960s and early 70s, we started to see the recessed areas of the symbol-disc colored either white (thus resembling the GL symbol as seen on the uniform) or the same lime-green as the ring’s energy beam. The latter coloring effect would later be interpreted by some artists (including painter Alex Ross) as a flat, glowing crystal/gem from which the ring’s emerald energy is emitted.
When Mike Grell redesigned the ring in 1976, and used the GL symbol itself as the shape of the ring’s face, he incorporated an actual domed gem into the center of it (sometimes colored dark green, like the rest of the ring, and sometimes the lighter, lime-green of the power beam effect). Some artists (such as Alex Saviuk and Joe Staton) would include this gem on both the V3 and V2, and others (such as Dave Gibbons, George Perez, and John Byrne) would not, although colorists would sometimes still color the empty symbol-hole the lighter, lime-green color (thus giving the impression of a gem either flush with the face or the ring, or recessed).
By the time of EMERALD DAWN and the GREEN LANTERN Vol. 3 relaunch, circa 1990, Hal Jordan was once again wearing a V1-style ring, and this time with a consistently two-tone color scheme, and the lime green color in the recessed areas of the symbol-disc, although this was not necessarily intended to depict a glowing center section of the ring.
By the turn of the century, computer-coloring and higher-quality paper allowed modern creators to create more realistic and dimensional coloring and shading effects with the green plasma-energy emitted from Green Lantern’s ring, as well as showing a realistic lighting effect coming from the recessed section of the ring.
Anyway, I came up with a way to perhaps simulate the modern rings’ effect. I’ve taken my modern-era design and created a three-part variant, with the base ring, a clear (or frosted) inner disc (to be printed in plastic or cut from plexiglass), and then a cap (containing the symbol). The inner disc can be painted a clear peridot color, and backed with my go-to glow-in-the-dark paint. Still working out the tolerances (and some parts may be too thin to print), but it’s coming along. The modern design lends itself to this, but the EMERALD DAWN version would be trickier, so I’ll likely go with a painted, two-tone look. And I think I’ll leave the early rings from the 60s a monotone green, to reflect how they actually looked on the page.