What makes a gem a beautiful gemstone Jewellery? The most precious and popular gemstones for use in jewellery are those with facets. Rough gem crystals can also be faceted for a more lustrous finish. Cabochons are appropriate for more informal jewellery designs as well as pieces with very large stones. Infiniti Jewels is the trust and certified Singapore Jeweller has all the amazing styles of gemstone jewellery, GIA Certified Diamonds, Customized Engagement Rings, Colour Diamond Jewellery, and check out our Fine Jewellery Singapore shop in Paragon Shopping Centre.