9.0 inches beautiful coaster which you can make even out of scrub yarn. It has many different usage such as on  a night stand, under a vase or on a coffee table, couple of them could be a nice gift will not take more than 45 min to make one.

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all what you need to make this beautiful coaster are:

1- a size 3.5 crochet hook

2- size 4 turquoise yarn

3- size 4 white yarn

4- spray starch

 

 how to crochet 3dc cluster, when crocheting 3dc cluster , for the 1st cluster start with making ch2 then 2hd (partially done), then yarn over and pull through all loops on the hook to complete all the stitches at the same time. for making the second and the rest clusters, male 3dc partially done, then yarn over and pull through all loops on the hook to complete all the stitches at the same
R1  in white yarn and size 3.5 hook cast on 6sc in magic ring , join with sl st
 R2  work into each sc  of R1, 1st cluster into the 1st sc,ch3 * cluster, ch3* x5times,  sl st into the 1st cluster, sl st, sl st into next 2sc (24)
 R3  work  *cluster,ch2, cluster, ch2* in each of ch3 spaces of R2, sl st  on the top of  1st cluster of R2, 2sl st into next 2sc  (36)
 R4  work *cluster,ch1, cluster, ch1* in each ch3 spaces of R3 sl st on the top of 1st cluster,  2sl st into next 2sc  (48)
 R5  ch3(count as 1st dc) ,1dc, ch1, 2dc,ch1, in 1ch space of R4 *skip 1ch space then work ,2dc, ch2, 2dc,ch1 into the next ch1 space* rep between *to * 10more times , sl st into the top of 3ch of R5      2sl st into next 2sc    (72)
 R6    ch3(count as 1st dc) ,1dc, ch2, 2dc,in 1st ch1 chain space of R5  *skip ch1 space then work , 2dc, 2ch, 2dc,ch1 into the next ch space* rep between *to * 10 more times , sl st into the top of ch3 of same R6  2sl st into the next 2sc    (84)
 R7   ch3 ,2dc, ch2, 3dc, ch1 , into 1st ch2 space of R6, . skip ch2  space then work {* into 3rd ch2 space, 3dc,ch2, 3dc,1ch*} rep between {to} 10 times, then work   sl st into the top of 3chs of same round (  )
 R8 ch3 ,3dc, ch2, 4dc, ch1 , into 1st ch2 space of R7, . skip ch1  space then work {* into 3rd ch2 space, 4dc,ch2, 4dc,1ch*} rep between {to} 10 more times, then work   sl st into the top of 3chs of same round, 2sl st into the next 2sc (  )
 R9 ch3 ,4dc, ch2, 5dc, ch1 , into 1st ch2 space of R8, . skip ch1  space then work {* into 2nd ch2 space, 5dc,ch2, 5dc,1ch*} rep between {to} 10 more times, then work   sl st into the top of 3chs of same round, 2sl st into the next 2sc (  )
 R10    ch3 ,5dc, ch2,6dc, ch1 , into 1st ch2 space of R8, . skip ch1  space then work {* into 2nd ch2 space, 6dc,ch2, 6dc,1ch*} rep between {to} 10 more times, then work   sl st into the top of 3chs of same round, 2sl st into the next 2sc (  )
 R11 ch3 ,6dc, ch2, 7dc, ch1 , into 1st ch2 space of R8, . skip ch1  space then work {* into 2nd ch2 space, 6dc,ch2,7dc,1ch*} rep between {to} 10 more times, then work   sl st into the top of 3chs of same round, 2sl st into next 2sc (  )
 R12 ch3, 1dc on top of next 4dc of R11,5dc into  the next 2ch space,, 5dc on top of next 5dc, ch1.   *skip ch1  and work on top of 3rd,4th,5th, 6th dc of R11 ,5dc in to ch2 space, 5dc onto the next 5dc* rep from *to* 10 more times sl st , finish off, cut and secure yarn
 R13  
 finishing: join turquoise yarn  as shown in the diagram above and   pictures below

 

 

 abbreviations 
 ch  chain
 sl st  slip stitch
 dc double crochet
 1st ch  first chain
 2nd  second 
 sp  space
 rep  repeat
 r  round
inc  increase ( make two dc in one sc)