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Opal detail

An opal is the lowest level of semi-precious gem in RuneScape. These are created by cutting an uncut opal with a chisel which gives 15 Crafting experience. They may also be stolen from H.A.M members using Thieving.

While cutting opals, the player will occasionally accidentally crush an uncut opal into a crushed gem and will receive only 3.8 Crafting experience.

(In a test of 1000 opals at Crafting level 1-27, 568 were cut while 432 were crushed. At levels 42-44, 670 opals were cut and 330 were crushed, in a test of 1000 opals at Crafting level 50-51, 741 opals were cut and 259 were crushed, 1000 opals at Crafting level 51-52, 828 opals were cut and 172 were crushed, 1000 opals at Crafting level 71, 855 opals were cut and 145 were crushed. And in a similar test with 1000 opals at level 96, 958 opals were cut and 42 were crushed. At level 99 only 24 out of 1000 were crushed.)

Level Total gems Successful Crushed % Successful
1-27 1000 568 432 56.8
42-44 1000 670 330 67.0
50-51 1000 741 259 74.1
51-52 1000 828 172 82.8
71 1000 855 145 85.5
82 5435 4898 537 90.1
96 1000 958 42 95.8
99 4533 4439 94 97.9

Based on this experimental data, the player chance of successfully cutting an opal could be roughly modeled by the following equation (times 100 for percentages):

Chance of success = 0.5 + 0.005(Crafting Level)

Using the chisel on an already cut opal make 12 opal bolt tips and gives the player 1.5 Fletching experience per gem. Opal bolt tips are used to tip bronze bolts, which can then be enchanted. Opals can be used to craft necklaces, amulets, rings or bracelets with a silver bar.