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certificate jewelry, Sapphire
Sapphire

sapphire is a precious gemstone, a type of the mineral corundum, include of aluminum oxide with trace amounts of elements such as iron, titanium, chromium, vanadium, or magnesium.

certificate jewelry, Diamond
Diamond

diamond is one of the best-known and most sought-after gemstones. they have been used as decorative items since ancient times. in the middle ages, the gemstone was considered a stone that could provide healing powers, curing depression and opening the heart.

certificate jewelry, Opal
Opal

opal is a hydrated amorphous form of silica. because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classify as minerals.