Cut glass and glass blowing production came from ancient techniques and were gradually refined over the ages. Cut glass objects were used as commodities, gifts, and jewelry in past millennia. Today exquisite cut crystal is sought after for its heirloom qualities and gifting allure.
Natural glass, like obsidian, is a dense volcanic glass, and has been used by man for millennia. To early man, obsidian glass was an extremely rare and valuable commodity, Because of the way volcanic glass fractures, sharp edges occur. This inherent quality of natural cut glass was put to use and was often made into sharp spear points and blades.
Man-made rudimentary glass was made from silica sand, plant ash and lime. Over time it was discovered that if glass was heated until it became semi-liquid, it may be molded or shaped and left to cool into a solid new piece or vessel. In ancient times glass pieces were valued as a substitute for precious stones, gems, and gifts.
During first century BC, the craft of melting and blowing glass into useable objects was developed. Glass pieces and items gradually became more common after the discovery of glassblowing. Objects such as vases, bottles, and cruets were mouth blown and mold blown during the Roman Empire, usually for ordinary purpose and daily use.
Common glass normally has a greenish hue. The green tint is caused by miniscule amounts of iron impurities in the sand used to make glass. Glass producers learned to make decorative and colored glass by adding metallic compounds and mineral oxides such as cobalt. Colored glass of reds, blues and greens became prevalent. After craftsmen learned to score and cut glass, they found clear glass refracted light in spectacular fashion. Thus, clear cut glass became popular, and demand for colored glass plummeted.
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