Size Chart

Australian Boulder Opal Necklace

SmallLess than 10 gramsSmall and light.
Medium> 10 and < 20 gramsMedium in size and weight.
Large> 20 gram and < 30 gramsLarge and relatively heavy.
Extra Large> 30Robust in size and weight.

Australian Boulder Opal Earrings

SmallLess than 3 gramsSmall and light.
Medium> 3 gram and < 7Medium in size and weight.
Large> 7 gramsRobust in size and weight.

Australian Boulder Opal Bolo Tie

SmallLess than 20 grams
Medium to LargeGreater than 20 grams

Australian Rough Boulder Opal Rock

SmallUnder 500 gramsHand size.
MediumFrom 500 gram to 1 kilo (1000 gram)Fits into cupped hands. Not overly big but substantial.
LargeAnything over 1 kiloHeavy.

Australian Polished Boulder Opal Rock

SmallLess than 200 gramsFits comfortably into hand.
Medium> 200 grams and < 500 gramHas weight and size but not overly so.
Large> 500 gramsSubstantial.

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