Classically, osmium is offered and sold in flat geometries. Osmium inlays are therefore also always flat shapes, but almost all requested shapes are possible, up to a length of 9 cm and surfaces of 80 cm². Some standard shapes like Osmium-Diamonds and Osmium-Stars are small flat elements in round and in star shape.

The orignal shape in which osmium is crystallized, osmium discs, are used as semi-finished products in manufacturing when these flat shapes are to be cut out.

However, when cut by wire EDM, in addition to the usable inlays, there are also cut-out residual parts that cannot be used further because they have already been crystallized but cut into negative shapes. This material is called offcut and is included in the price calculation of jewelry.

Hublot writes:

"A Classic Fusion with the most precious of precious metals".

If luxury is synonymous with rarity, then osmium is the most prestigious of precious metals. In the Classic Fusion Firmament, as an absolute world first in the history of watchmaking, Hublot has incorporated this metal, which is one of the rarest elements on our planet, into a timepiece."

Osmium, found in platinum ore, is so rare that about 10,000 tons of this ore are required to obtain just under 28 grams of osmium. Platinum itself is a metal of great rarity value, and when global deposits are compared, about 13,000 tons of platinum are matched by only about 200 tons of osmium. Osmium is the rarest stable element in the earth's crust.

Because osmium is quite unstable in its raw metal state, Hublot uses a crystallized form for its Classic Fusion Firmament. This is created by a unique process developed by a team of scientists and researchers in the neighboring Swiss canton of Valais. In this process, the metal osmium reaches its melting point at 3,033 °C, at which point it changes its structure and transforms into osmium crystals, a far more stable form of this element.

The Classic Fusion Firmament features a 45mm case in polished and satin-finished black ceramic or fully polished platinum. Hublot has not limited itself to making its dial out of osmium, but the brand has also managed to incorporate the metal crystals into the skeletonized tourbillon movement. It provides a stunning contrast to the anthracite ruthenium-coated bridges visible on both sides of the movement.

Through their crystals, which vary in size from one ten-thousandth of a millimeter to a few millimeters, the osmium elements exude a silvery and blue glow reminiscent of a starry night sky, which inspired Hublot to name this watch "Firmament." This term describes the sky as a tangible mass and was already common in many cultures in ancient times.