Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to buy an opal [title] Familiarize yourself with opals and their terminology. [step] Opals differ from other precious gemstones in their basic composition and how they are valued. These unique stones come in a wide range of colors and patterns, both of which can change, depending on the angle you view them from.

Ending1: [title] Decide how the stone will stand out among other similar gemstones. [step] Selection from an unconventional choice such as turquoise works perfectly well. Ending2: [substeps] Opal stones come in a variety of colors, shapes, and textures. It is important that you decide on a ruby or sapphire for your opal, as these gemstones are far more valuable at low price than others. Ending3: Since buying an opal can be a significant investment, learn as much as you can about them before you start shopping. This will ensure you make an informed decision and get what you pay for. Ending4: Consider buying opal jewelry before buying a diamond, as a diamond is a very valuable gemstone. [substeps] Opals are typically identified as a " ruby.

Answer format: ending1/ending2/ending3/ending4