Research was conducted about the approximate conversions among size, shape, weight, number of strands and pieces of pearls.

Size (mm)	Round & Off-Round			Button			Rice
	g/strand	strings/kg	pieces/kg	g/strand	strings/kg	pieces/kg	g/strand	strings/kg	pieces/kg
2.0~2.5	(4)	(180)	(45,000)	(3)	(240)	(80,000)	(3)	(160)	(53,300)
2.5~3.0	(4.8)	(210)	(31,000)	(4)	(207)	(51,750)	(4)	(140)	(35,000)
3.0~3.5	(6)	(160)	(18,100)	(5)	(175)	(35,100)	(5)	(120)	(24,000)
3.5~4.0	(9)	(115)	(13,000)	(8)	(160)	(20,000)	(7)	(100)	(13,280)
4.0~4.5	(11)	91	9,000	(11)	(145)	(13,180)	(10)	(80)	(8,000)
4.5~5.0	(14)	68	6,600	(14)	(130)	(9,280)	(13)	(71)	(5,460)
5.0~5.5	(17)	59	5,000	(17)	(115)	(6,760)	(16)	(62)	(3,870)
5.5~6.0	(20)	50	3,900	(21)	(102)	(4,850)	(20)	(58)	(2,900)
6.0~6.5	(24)	41.6	2,880	(26)	(90)	(3,460)	(25)	(55)	2,200
6.5~7.0	(27)	37	2,400	(29)	(84)	(2,890)	(27)	(51)	1,880
7.0~7.5	(31)	32	1,850	(32)	(78)	2,200	(30)	(47)	1,500
7.5~8.0	(36)	28	1,520	(38)	(73)	1,850	(32)	(43)	1,270
8.0~8.5	(41)	24	1,280	(45)	(68)	1,500	(35)	(40)	1,050
8.5~9.0	(46)	22	1,060	(50)	(64)	1,280	(42)	(36)	850
9.0~9.5	(52)	19.2	900	(54)	(59)	1060	(46)	(32)	760
9.5~10.0	(57)	17.5	780	(59)	(55)	930	(52)	(29)	660
10.0~10.5	(64)	15.6	660	(68)	(51)	800	(60)	(24)	580
10.5~11.0	(70)	14.2	580	(68)	(51)	720	(60)	(24)	510
11.0~11.5	(75)	(13.3)	500	(77)	(46)	(600)	(68)	(20)	(300)
11.5~12.0	(75)	(13.3)	450	(77)	(46)	(600)	(68)	(20)	(300)
12.0~12.5	.	11	.	.	.	480	.	.	.
12.5~13.0	1	11	1	1	1	480	1	1	1