Free form Australian Opals are excellent for handmade jewellery as each of them is unique.
Matching pairing is perfect for making earrings, cufflinks etc.
There are opal jewellery in 14K gold and 925 silver with gold and rhodium plated.
There are oval, round, pear and marquise shape with calibrated sizes.
Opal doublet grading is depending on the following aspects
Play of colour