Gemstone usually found in. For example, diamonds, which have a cubic crystal system, are often found as octahedrons. Gemstones are classified into different "groups", "species", and "varieties". For example, ruby is the red variety of the species corundum, while any other color of corundum is considered sapphire. Other examples are the emerald (green), aquamarine (blue), red beryl (red), goshenite (colorless), heliodor (yellow) and morganite (pink), which are all varieties of the mineral species beryl. Gems are characterized in terms of refractive index, dispersion, specific gravity, hardness, cleavage, fracture and luster. They may exhibit pleochroism or double refraction. They may have luminescence
Gemstone (database) of VMware, announced it had entered into a definitive agreement to acquire GemStone. On May 2, 2013, GemTalk Systems acquired the GemStone/S platform from Pivotal Software (the EMC and VMware spin-off).. Gemfire remained with Pivotal's Big Data division. The product is available standalone but is also integrated into its Cloud Foundry PaaS as "Pivotal Cloud Cache". GemStone builds on the programming language Smalltalk. GemStone systems serve as mission-critical applications. GemStone frameworks still see some interest for web services and service-oriented architectures. A recent revival of interest in Smalltalk has occurred as a result of its use to generate JavaScript for