31 terms · Updated November 10, 2026

G-SHOCK and bezel glossary

The words you meet when shopping for a G-SHOCK bezel or an iced-out watch, from “bezel” and “buss down” to “VVS” and “module”, each explained in a sentence or two.

Aftermarket: A part made by a company other than the watch's maker. Custom metal and moissanite G-SHOCK bezels are aftermarket parts, not Casio parts.
Baguette cut (also: baguette): A long, rectangular stone cut with step-like facets. Baguette bezels have a stepped, mirror-like look and cost more to set than round stones.
Bezel (also: bezel cover, G-SHOCK bezel): The outer cover around the face of a watch. On most G-SHOCKs the bezel is a separate resin part held on by four small screws, which is why it can be replaced or customized.
Brass: The base metal of most stone-set bezels. It is plated in the finish you choose, such as white gold, gold or rose gold.
Buss down (also: bust down, bussdown): Slang for a watch or piece of jewelry covered edge to edge in stones that were set after it left the factory.
Carbon Core Guard: Casio's name for a case made of carbon fiber–reinforced resin. It is what keeps the GA-2100 slim and light.
Case back: The steel plate on the back of the watch. On a G-SHOCK it is engraved with the model name and the module number.
CasioAk (also: CasiOak, Casioak): The fan nickname for the octagonal G-SHOCK GA-2100 and its 2100-series relatives. It is not an official Casio name.
Claw setting (also: prong setting): A way of holding a stone with small metal claws, leaving more of the stone visible than a pavé setting.
Cubic zirconia (also: CZ): A lab-created diamond look-alike made of zirconium dioxide. It rates 8 to 8.5 on the Mohs scale, softer than moissanite, and does not pass a thermal diamond tester.
D color: The top grade of the diamond color scale, which runs from D (colorless) to Z. D color moissanite has no yellow or gray tint.
Diamond tester: A handheld tool that checks whether a stone behaves like diamond. Thermal testers pass both diamond and moissanite; electrical-conductivity testers tell the two apart.
Dispersion (also: fire): How strongly a stone splits light into rainbow colors. Moissanite's dispersion is 0.104 and diamond's is 0.044, so moissanite shows more colored flashes.
Finish (also: plating color): The color of the plating on a bezel: white gold, gold, rose gold, black or two-tone. The finish changes the color of the metal, not the stones.
Iced out (also: iced-out): Covered in stones. An iced-out G-SHOCK has a stone-set bezel, and sometimes a stone-set case or band as well.
Lab-grown diamond (also: synthetic diamond): A real diamond made in a laboratory instead of mined. It is carbon, with a hardness of 10, and is a different stone from moissanite.
Mod kit (also: mod, CasioAk mod): A set of aftermarket parts that changes a watch's case and band, such as the stainless steel case and band kits made for the GA-2100.
Model number (also: model name): The name engraved on the case back, such as GA-2100 or DW-5600. Bezels and straps are bought by model number.
Module (also: module number): The movement inside a G-SHOCK, identified by a four-digit number in a box on the case back, such as 5611. Casio publishes an operation guide for each module.
Mohs scale: A 1-to-10 scale of scratch hardness. Diamond is 10, moissanite about 9.25 to 9.5 and cubic zirconia 8 to 8.5.
Moissanite: A lab-created gemstone made of silicon carbide. It is nearly as hard as diamond, shows more fire and costs far less, which makes it the usual stone for iced-out watch bezels.
Multi-Band 6 (also: atomic timekeeping): Casio's radio time-setting feature, which receives time calibration signals so the watch sets itself. Found on GW models such as the GW-6900.
Pavé (also: pave, micro-pavé): A setting in which many small stones sit close together so the surface looks paved with them.
Plating (also: plated): A thin layer of metal over a base metal. Plating gives a brass bezel its gold, rose gold or white gold color, and it can wear with friction and chemicals.
Pre-order: An item that is not in stock but can be ordered. It ships after the lead time shown on its product page.
Spring bar: The small sprung pin that holds a strap to a watch case. A spring bar tool compresses it to release the strap.
Strap (also: band, bracelet): The part that holds the watch on the wrist. On a G-SHOCK it is two resin pieces, or a metal bracelet on metal models and mod kits.
Tough Solar: Casio's solar charging system, which recharges the watch's battery from sunlight or indoor light. Found on models such as the GA-B2100 and GW-6900.
Two-tone: A bezel or kit finished in two plating colors, for example white gold with rose gold.
VVS (also: VVS moissanite): “Very, very slightly included”: a clarity grade from the diamond scale for stones whose flaws are hard to see even at 10× magnification.
Water resistance (200 m / 20 bar) (also: waterproof): Casio's rating for the stock G-SHOCK models in our guides, suitable for swimming. Custom modifications can affect it.